Top 10 Best Costco Diamond Rings | 2021 Reviews + Guide

best costco diamond rings review

Equally rare and stunning, brilliant and mysterious, the diamond ring has become a symbol of luxury and eternal love. This precious item alone conjures up thousands of images of rare, sparkling, precious, and desirable tokens of love. While diamond rings are ethereally beautiful, they also come at a big price. 

With so many ring styles and jewelry brands to choose from, finding out how and where to buy the best diamond ring can seem confusing and overwhelming. Since it’s going to be one of your biggest purchases you will make, you want to ensure that you are doing it right while giving great value to your money. 

A better way to start your search is to begin at one of the biggest billion-dollar global retailers, Costco. It is a membership warehouse club devoted to bringing its customers the best possible products and prices on quality brand-name merchandise. 

Besides essential household items, Costco is proud to offer its members an abundant line of high-end jewelry. They carry a wide selection of jewelry designs from classic to contemporary, including diamond rings. 

This article is for those who already feel overwhelmed even before starting their search for the ideal diamond ring. This user-friendly buying guide will take the stress out of your diamond ring shopping experience. It will discuss everything you need to know to get the best Costco diamond ring that offers the best value and price.

Top 10 Best Costco Diamond Rings Reviewed

  1. Baguette & Round Brilliant 3.20 ct. Diamond Platinum Band by Costco Jewelry – Best Overall
  2. Princess-Cut 2.00 ct. Platinum Channel Set Diamond Eternity Band by Costco Jewelry – Best Value
  3. Round Brilliant 0.08 ct. Stackable Diamond Band by Costco Jewelry – Editor’s Choice
  4. Heart-Shaped Round Brilliant Diamond 0.44 ct. 14k White Gold Ring by Costco Jewelry
  5. Round Brilliant 1.50 ct. Diamond Platinum Band by Costco Jewelry
  6. Round Brilliant 1.00 ct. Diamond Platinum Halo Ring by Costco Jewelry
  7. Round Brilliant 1.70 ct. Diamond Platinum Halo Ring by Costco Jewelry
  8. Round Brilliant 1.25 ct. Diamond Platinum Solitaire Ring by Costco Jewelry
  9. Oval-Cut Brilliant 2.10 ct. Diamond 14kt White Gold Milgrain Band by Costco Jewelry
  10. Round Brilliant 1.35 ct. Diamond Platinum Ring by Costco Jewelry

#1. Baguette & Round Brilliant 3.20 ct. Diamond Platinum Band by Costco Jewelry – Best Overall

Baguette & Round Brilliant 3.20 ct. Diamond Platinum Band by Costco Jewelry

 

Specifications: 

  • Metal: 950 Platinum
  • Shape: Baguette and round brilliant
  • Carat: 3.20 ct.
  • Quantity: 32
  • Clarity: (VS2) Very slightly included 
  • Color: (I) Near colorless

If solitaire diamond rings do not excite you anymore, this first selection will certainly perk you up. The Baguette & Round Brilliant 3.20 ct. Diamond Platinum Band features round brilliant-cut diamonds arranged in the upper and lower edge of its platinum band, filled with vertically arranged baguette-cut diamonds on the middle shank. 

This ring gives off a very classy vintage design, making it an ideal anniversary or birthday gift for your wife or mother. You will love how its round brilliant-cut stones are carefully arranged on each side of the band, giving this ring a crown-like impression.

This diamond ring is ideally worn on formal occasions like black-tie events. It perfectly complements a little black dress or any single-tone outfit. You can get this for $4,599.99. However, make sure to quickly add this to your cart as sizes may be too limited.  

ProsCons
Lots of bling and sparkle
Too big for thin and tiny fingers
Great value for money
Large visible imperfections
Very decent weight
Very limited sizing
High-end quality

#2. Princess-Cut 2.00 ct. Platinum Channel Set Diamond Eternity Band by Costco Jewelry – Best Value

Princess-Cut 2.00 ct. Platinum Channel Set Diamond Eternity Band by Costco Jewelry

Specifications: 

  • Metal: 950 Platinum
  • Shape: Princess-cut
  • Carat: 2.00 ct.
  • Quantity: 27
  • Clarity: VS2 (Very slightly included)
  • Color: I (Near-colorless)

Looking for a sparkly wedding band that looks eye-catching but not too flashy? Then, the Princess Cut 2.00 ct. Platinum Channel Set Diamond Eternity Band might be the right diamond ring for you. It features dazzling princess-cut diamonds in a solid channel setting, arranged in a platinum eternity band. 

This diamond ring is the perfect jewelry piece if the traditional white or yellow gold ring for a wedding band is too outdated for you. Its modern design provides incredible brilliance from every angle. You can also pair it with your future groom with a channel-set diamond ring for men. 

This piece costs $2,199.99, which can be a little pricey for others due to its sleek platinum band. Platinum is the most durable precious metal used for rings that guarantee better durability and unmatched brilliance. That is why you can assure that this ring will serve you well for years to come. 

ProsCons
The ring has a solid feel around the finger
Diamonds kept bumping on any surface
Channel setting secures the diamonds
Not suitable for hands-on jobs
Durable platinum band
Slight bumpy feel
Not too flashy

#3. Round Brilliant 0.08 ct. Stackable Diamond Band by Costco Jewelry – Editor’s Choice

Round Brilliant 0.08 ct. Stackable Diamond Band by Costco Jewelry

Specifications: 

  • Metal: 14k yellow gold
  • Shape: Round brilliant
  • Carat: 0.08 ct.
  • Quantity: 1
  • Clarity: (VS2) Very slightly included
  • Color: (I) Near colorless 

Fancy a cute diamond ring with just the right amount of glimmer? The Round Brilliant 0.08 ct. Stackable Diamond Band perfectly blends simplicity and style in a single stackable ring. It showcases a tiny round brilliant-cut diamond in bezel-set arranged in a twisting band of 14k yellow gold. This ring makes a fashionable stackable ring or a standalone piece. 

This tiny jewelry piece is perfect for women who prefer simplicity and subtlety. If you think halo diamond rings and pavé-settings are too much for you, then this ring might be the one you’re looking for. Despite the incredibly tiny center stone, its round diamond gives off a blinding brilliance whenever the light hits it. 

Diamond stackable rings are the cheapest option if you want to own a genuine diamond ring. You can get this ring for only $229.99, making it one of the most affordable selections on this list. 

ProsCons
Small yet noticeable diamond stone
Works only on the thin, long finger
Ideal for multiple uses and stylingToo small than advertised
Good weight and thickness
Diamonds are very tiny
Doesn’t bend easily
Can be worn alone

#4. Heart-Shaped Round Brilliant Diamond 0.44 ct. 14k White Gold Ring by Costco Jewelry

Heart-Shaped Round Brilliant Diamond 0.44 ct. 14k White Gold Ring by Costco Jewelry

 

Specifications: 

  • Metal: 14k white gold
  • Shape: Round brilliant
  • Carat: 0.44 ct.
  • Quantity: 45
  • Clarity: VS2 (Very slightly included)
  • Color: I (Near-colorless)

Unleash your inner femininity and passion for romance with this heart-shaped diamond ring. It is a pavé-set engagement ring featuring a cluster of round brilliant-cut diamonds, forming a heart-shaped center stone. This ring will give you extreme brilliance everywhere you go as it comes with a whopping 45 pieces of dazzling diamond stones. 

This ring also makes a great fashion ring for women who prefer an extra amount of bling for their everyday outfits. You can also give it as a romantic gift for your special someone to signify your undying admiration. Although it may look like a solitaire ring from afar, taking a closer look at its tiny details will show you how intricate its design. You can get this ring for $699.99 at Costco Jewelry.  

ProsCons
Reflective quality diamondsStones are at risk of falling off
Perfect right-hand ring
Very delicate setting
Breathtaking sparkle

#5. Round Brilliant 1.50 ct. Diamond Platinum Band by Costco Jewelry

Round Brilliant 1.50 ct. Diamond Platinum Band by Costco Jewelry

 

Specifications: 

  • Metal: 950 Platinum
  • Shape: Round brilliant
  • Carat: 1.50 ct.
  • Quantity: 24
  • Clarity: VS2 (Very slightly included)
  • Color: I (Near-colorless)

Are you looking for a thick diamond ring that is equally elegant and eye-catching? The Round Brilliant 1.50 ct. Diamond Platinum Band exhibits multiple diagonal rows of three round brilliant-cut diamonds in a sleek platinum band. You can wear this ring if you want to make a fashionable statement to complement your formal outfit.

Each of the diamond stones has a VS2 clarity, which means it is almost free of inclusions or blemishes. Despite its medium-sized diamonds and sturdy platinum band, this ring is incredibly comfortable to wear, without feeling heavy or bumpy. 

This ring is all yours for only $1,999.99. Since Costco’s ring sizes are quick to run out, you may want to get this ring immediately since it has a very limited ring size. 

ProsCons
Does not overwhelm small and thin fingers
Quite a delicate piece
Very comfortable to wear
Slightly expensive
The band is not too thick

#6. Round Brilliant 1.00 ct. Diamond Platinum Halo Ring by Costco Jewelry

Round Brilliant 1.00 ct. Diamond Platinum Halo Ring by Costco Jewelry

 

Specifications: 

  • Metal: 950 Platinum
  • Shape: Round brilliant
  • Carat: 0.70 ct.
  • Quantity: 19
  • Clarity: VS2 (Very slightly included)
  • Color: I (Near-colorless) 

Vintage diamond rings are known to stand the test of time. Although modern designs come and go, vintage rings remain timeless and fashionable. One example is the Round Brilliant 1.00 ct. Diamond Platinum Halo Ring, a bold, attention-grabbing, and impressive diamond ring. It combines a cathedral shank with a vintage-inspired halo of diamonds encircling a large, round diamond center stone. 

This Costco halo ring is set in an eye-catching platinum band with milgrain detailing, giving it a flower-like design. Costco offers this ring for $3,499.99, a great deal for a vintage diamond ring. Due to its bold and flashy design, you may want to wear this ring on formal occasions, especially if you are wearing a single-tone gown. 

ProsCons
Fantastic quality and artistry
Limited sizing (5, 6, 7)
Visibly stands out
A little flashy
Set very nicely
Sparkles a lot

#7. Round Brilliant 1.70 ct. Diamond Platinum Halo Ring by Costco Jewelry

Round Brilliant 1.70 ct. Diamond Platinum Halo Ring by Costco Jewelry

 

Specifications: 

  • Metal: 950 Platinum
  • Shape: Round brilliant
  • Carat: 1.00 ct.
  • Quantity: 49
  • Clarity: VS2 (Very slightly included) 
  • Color: I (Near-colorless)

The halo engagement ring has become a classic favorite among women due to its incredible brilliance and elegant design. The Round Brilliant 1.70 ct. Diamond Platinum Halo Ring from Costco features a stunning diamond halo and pavé diamond laden shank. Its center stone is held secured in place by four prongs, providing ultimate visibility while showcasing the diamond’s brilliance.

With a total carat weight of 1.70 ct. for the center stone alone, this diamond ring is a perfect choice for an engagement ring that is equally impressive and breathtaking. It is also set in a sleek platinum band to guarantee maximum durability and long wear. 

You can get this ring for $6,999.99 at Costco Jewelry. Although it may be a little pricey, its quality is certainly worth the price. You can match this halo diamond ring with any gown or cocktail outfit for an extra glimmer. 

ProsCons
Can be appraised much higherIGI certificate is not reliable
Stunning diamond halo ring
Sizeable within one size

#8. Round Brilliant 1.25 ct. Diamond Platinum Solitaire Ring by Costco Jewelry

Round Brilliant 1.25 ct VS2 Clarity, I Color Diamond Platinum Solitaire Ring

 

Specifications: 

  • Metal: 950 Platinum
  • Shape: Round brilliant cut
  • Carat: 1.25 ct.
  • Quantity: 1
  • Clarity: VS2 (Very slightly included)
  • Color: I (Near-colorless)

If you’re searching for a diamond ring that is equally elegant, simple, and versatile, a solitaire setting is your ultimate choice. Since diamond solitaire rings don’t contain any halo or pavé-set diamonds, its center stone is the main focus of attention. 

This classic solitaire ring is the most typical design for an engagement ring. It is a great jewelry piece for ladies who greatly values simplicity over sheer elegance. The design is not too over the top nor flashy, but it is sophisticated and eye-catching enough. 

Despite its simple design, this Costco solitaire diamond ring costs $8,499.99 due to the excellent quality of its mounted diamond and metal. Nevertheless, you can guarantee that this ring will serve you well for years to come. Due to its timeless design, you pass it down as a jewelry heirloom. 

ProsCons
Well secured six-prong settingDesign is too common
Classic diamond solitaire ring
Very brilliant and sparkling

#9. Oval-Cut Brilliant 2.10 ct. Diamond 14kt White Gold Milgrain Band by Costco Jewelry

Oval-Cut Brilliant 2.10 ct. Diamond 14kt White Gold Milgrain Band by Costco Jewelry

 

Specifications: 

  • Metal: 14k white gold
  • Shape: Oval cut
  • Carat: 2.10 ct.
  • Quantity: 7
  • Clarity: VS2 (Very slightly included) 
  • Color: H (Near-colorless)

Another vintage-inspired diamond ring takes another spot on this list. The Oval Cut Brilliant 2.10 ct. Diamond 14kt White Gold Milgrain Band is a diamond fashion ring, which you can also use as a wedding band. It features a row of oval-shaped diamonds with milgrain edges, giving it a unique and intricate look. 

This ring also makes a great present for anniversaries or birthdays. It will certainly go well for ladies who want something equally classy and modern. Its oval-shaped diamonds come in a noticeable size that is too hard not to ignore. Despite its bezel setting, the diamond stones give off incredible brilliance that is simply eye-catching. 

ProsCons
Quite noticeable with large oval diamonds
Slightly outdated design
Great value and price
Very antique look

#10. Round Brilliant 1.35 ct. Diamond Platinum Ring by Costco Jewelry

Round Brilliant 1.35 ct. Diamond Platinum Ring by Costco Jewelry

 

Specifications: 

  • Metal: 950 Platinum
  • Shape: Round brilliant
  • Carat: 1.00 ct.
  • Quantity: 17
  • Clarity: VS2 (Very slightly included)
  • Color: (I) Near colorless                                      

While countless ring designs are available online, you might be looking for one-of-a-kind jewelry with a unique twist. One example is the Round Brilliant 1.35 ct. Diamond Platinum Ring. It offers a unique take on eternal solitaire rings, combining the simplicity of solitaire settings and contemporary design. 

This ring is set in an enduring platinum band, featuring a bypass shank that wraps itself around a medium-sized diamond center stone. It also comes with an added touch of luster and brilliance with its channel set diamonds and two pieces of side stones on either side of the center stone. 

You can get this ring for $6,999.99 at Costco. Due to its versatile design, you can use this ring as an engagement ring or wedding band. You can also give it as a present to celebrate special milestones. 

ProsCons
Unique diamond settingSide stones are at risk of falling off

Top Pick for Best Costco Diamond Rings: Baguette & Round Brilliant 3.20 ct. Diamond Platinum Band by Costco Jewelry

Defined by sophistication and elegance, diamond rings are not called classic for anything. From solitaire settings to halo and pavé settings, diamond rings come in different styles that never go out of style. However, with so many settings and designs to choose from, it can be hard to figure out which one will suit your partner’s preference. 

The great thing about jewelry pieces is that there is always a sparkling diamond ring for every budget. You can find them on online retail websites like Costco. This buying guide has provided the top 10 best-selling styles in Costco Jewelry. It includes various diamond shapes, setting types, precious metals, and a range of diamond stones. 

While every selection in this list proves to be stunning and valuable, the Baguette & Round Brilliant Diamond Platinum Band takes the top spot as the best Costco diamond ring.

With over 250 reviews, this diamond fashion ring features round brilliant-cut diamonds arranged in its platinum band’s top and bottom edge. The round diamonds are separated in the middle by baguette-cut diamonds. 

You will also love how its round diamonds are delicately arranged on its shank, giving this ring a crown-like design. This stunning ring provides a classy vintage vibe, an ideal present for weddings, anniversaries, and birthdays. 

This ring is ideally worn on formal occasions due to its elaborate design. You can match it with any formal gown or cocktail dress for extra fire and brilliance. 

Choosing the best diamond ring comes down to your preference and budget. Before taking your final pick, make sure that you are not overpaying. The only way to get the best value for your money is to select high-quality options based on the correct diamond standard. You may continue reading the succeeding sections below to help you search for the finest diamond ring while staying within your budget range. 


Best Brands for Costco Diamond Rings

One of the essential aspects of buying quality diamond jewelry is where to shop. A reliable and reputable jeweler or jewelry store should walk you through the jewelry shopping experience while giving you the freedom to shop at your own pace. 

The best jewelry retailer should demonstrate a commitment to professionalism and has an established reputation. They should also be passionate about their services and love sharing their expertise with customers. They offer an abundant diamond jewelry selection while explaining the subtle differences between its styles, metals, grade, and value. 

Costco Wholesale

One example is Costco Wholesale. Besides their essential grocery items and warehouse supplies, which they are well-known for, they also have a full line of high-end jewelry for men and women. They have a massive variety of jewelry styles, ranging from classic to contemporary and from vibrantly colored gemstones to lustrous diamonds.

Costco also offers a generous selection of designer watches in various materials and styles. They also take pride in the quality of their jewelry and superior craftsmanship. Jewelry buyers can shop with confidence, knowing that each of their jewelry pieces has been specifically hand-selected and carefully evaluated by Costco’s expert gemologists. 

Costco offers only finished jewelry. No semi-mounts or loose stones are available in their online inventory or their physical warehouse. The majority of their jewelry items are available in either 18k gold, 14k gold, and 950 platinum, while a few of their pieces are available in stainless steel and silver as well. 

Unfortunately, Costco cannot customize jewelry or offer other metal preferences beyond what is offered for a specific piece. Also, Costco does not resize and clean jewelry. You may also visit their warehouse as some of the jewelry pieces offered online can be seen there. 


Features to Consider When Buying Costco Diamond Rings (Buyer’s Guide)

Choosing a diamond ring involves choosing your desired shape and picking high-quality options according to the 4Cs without overpaying. You also have to compare various pieces to see which one suits your preference and budget. Here are some of the essential guidelines you need to know to find the perfect diamond ring. 

Cut

Cut refers to the sparkle factor and not the ring shape. Cuts are ranked from excellent to poor. When a diamond is cut into a particular shape, like oval or pear, it is done with specific limitations so that its facets interact with light to achieve maximum bling. 

Carat

A diamond’s weight or size is measured in carats. The average size for a diamond used in engagement rings is at least one carat or 200 milligrams. 

Clarity

Despite being a flawless-looking stone, a diamond also has its fair share of flaws or inclusions. These are tiny white or black lines or dots that happen naturally as the diamond is formed under the Earth’s surface over millions of years. These minor imperfections determine a diamond’s clarity, rated on an intricate scale from flawless to included. The fewer, smaller, and less visible its inclusions, the higher its price. 

Color

Diamonds come in a range of shades, but the rarest varieties are colorless. Color is graded on a scale from D (no color) to Z (visibly yellowish). A D-graded diamond is the most expensive. 

There are also fancy colored diamonds, like yellow, blue, pink, orange, and even chocolate, which have become very popular. The more vivid and saturated the color, the more precious the stone. 

Shape

The type of diamond you will choose should reflect your taste and style. It can also serve as an added embellishment for your ring stack options. The most sought-after shape is the round cut, which is the best shape that can reveal a diamond’s brilliance. Oval-shaped diamonds are best for those who have long, lean fingers. 

Those who go for vintage style should opt for cushion-cut, while the marquise has a long, tapered style that maximizes a diamond’s carat size. 

Budget

There is no need to save up for three month’s salary to get a decent engagement ring. In truth, you can find a nearly-one carat solitaire engagement ring for as low as $1,500. Whatever type of diamond ring you choose will always come down to how you prioritize your budget, including the quality, setting, and add-ons. For those on a tight budget and can’t afford any large bling, you can settle with a simple pavé or platinum band that offers more room to grow. 


Conclusion

Most people have been spending too much on diamond rings for several reasons. They are buying far up the wrong scale, focusing on the wrong things, and most of all, they can’t easily evaluate what the jeweler is showing them. In truth, you don’t need to buy the most expensive or the cheapest diamond ring; you just need to buy smart. 

This guide has discussed how to get the best value for your money when buying a diamond ring at Costco and how to become a smart diamond shopper. Purchasing a diamond ring requires a little research and intensive decision making. Once you know your priorities, preference, and budget, jewelry shopping won’t be a problem anymore. 

While Costco is generally known as a global retailer of essential home items and warehouse supplies, they also have a jewelry line called Costco Jewelry. They offer a wide selection of high-end jewelry for men and women. From vibrantly colored gemstones to lustrous diamonds, Costco carries an extensive array of quality jewelry marked by superior craftsmanship.  

One of Costco’s bestselling selections is the Baguette & Round Brilliant 3.20 ct. Diamond Platinum Band. Named as the top pick for the best Costco diamond ring, this piece has obtained a total of more than 250 reviews on their website. It features round brilliant-cut diamonds neatly arranged in the top and bottom edge of its platinum band, separated by baguette-cut diamonds in the middle. 

Jewelry lovers will love how this ring is carefully crafted with its exquisite diamonds along its shank. It gives off a classy vintage design, perfect for the most special person in your life. 

Hopefully, this buying guide has helped ease your worries when shopping for the perfect diamond ring. This jewelry guide is intended to help you search for diamond jewelry before making your final purchase and understand the basic quality factors on what makes the best diamond ring.  


FAQS (Frequently Asked Questions)

How do you take care of a diamond ring?

Although diamonds may be the hardest substance on the Earth’s surface, they still can get damaged, scratched, or scuffed. That is why it is essential to know maintenance guidelines to ensure your diamond ring will retain its beauty for years to come. 

When storing a diamond ring or any diamond jewelry, don’t jumble them with other pieces since diamonds can easily scratch other jewelry. You can keep them in a fabric-line jewel case or a box with dividers or compartments. 

Also, avoid wearing diamonds when doing intensive hand-work. Even though a diamond is incredibly durable, a hard blow can still damage or chip it. They also look best when they are clean, as it reveals its true fire and brilliance. You can clean it with a special purpose jewelry cleaner, a mixture of water and ammonia, or a mild detergent. Dip the jewelry into the mixture, and use a soft brush to remove dirt or dust that settled under the setting. 

Should I get insurance for my diamond ring?

There have been horror stories about customers who lost their diamond jewelry and having no insurance. With the financial, emotional, and personal nature of diamonds, you may consider insuring your purchase. Insurance offers complete coverage and peace of mind. 

Before getting jewelry insurance, you will need an appraisal. A certified or accredited appraiser will provide the appraisal report. Diamond jewelry often gets appraised at 30% greater than the original purchase price, which is ample coverage for your diamond or jewelry. 

How do I budget when buying a diamond ring?

Buying a diamond ring is a very personal decision involving several personal factors. Before you start your search, do high level, preliminary research. You should also check out the average diamond expenditure and see if it’s within your budget range. You may want to consider increasing any of the 4 Cs for those who want to spend more. 

If you find a piece outside your price range, start pairing down the 4 Cs as it will help you balance your budget. You should also set a baseline and know the budget before beginning your search for the ideal diamond ring. 

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