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GIA Certified 3.58 Carat Natural Alexandrite, Alexandrite Gemstone Natural
Located in Los Angeles, CA
Show off your love of all things gorgeous and sparkly with a natural Alexandrite gemstone. This is
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

Alexandrite Diamond Platinum Ring, GIA Certified
Located in Beverly Hills, CA
A classy stylish ring featuring a 1.69 carat natural alexandrite certified by the GIA. It has a
Category

21st Century and Contemporary American Fashion Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 1.72 Carat Alexandrite Ring
Located in Trumbull, CT
GIA Certified 1.72 CaratAlexandrite and white round diamonds 0.83 carat set in 14 karat white gold
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Alexandrite, 14k Gold

GIA Certified 1.33 Carats Color Changes Alexandrite
Located in Los Angeles, CA
beauty without visible imperfections. Certified by the Gemological Institute of America (GIA), this
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified 0.82 Carats Color Change Alexandrite
Located in Los Angeles, CA
without visible imperfections. Accompanied by a GIA Report, this Alexandrite is certified by the
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified 0.69 Carats Color Changes Alexandrite
Located in Los Angeles, CA
This natural Alexandrite gemstone weighs 0.69 carats and has a cushion shape with measurements of
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified 3.35 Carat Alexandrite Diamond Ring
Located in Trumbull, CT
Natural GIA Certified 3.35 Carat Alexandrite which color changes from yellowish to greenish
Category

21st Century and Contemporary American Art Deco Engagement Rings

Materials

Alexandrite, 18k Gold

GIA Certified 1.13ct Natural Alexandrite Color change 54774
By Unbranded
Located in New York, NY
GIA Certified Natural Alexandrite 1.13ct Transparent Cushion Cut 6.98 x 4.78 x 3.83 Report
Category

21st Century and Contemporary Russian Empire Loose Gemstones

Materials

Alexandrite

GIA Certified 21.85 Carat Natural Color Change Alexandrite
Located in New York, NY
This stunning oval over 21 carat genuine alexandrite – a rare color-change variety of chrysoberyl
Category

2010s Malagasy Loose Gemstones

Materials

Alexandrite

GIA Certified Color Change Alexandrite and Diamond Ring
By Belrose Estate Jewelers
Located in Santa Barbara, CA
Would you wear this Alexandrite as a cocktail or gemstone engagement ring? GIA certified with an
Category

2010s American Contemporary Engagement Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 9.85 Carat Natural Color Change Alexandrite
Located in New York, NY
This stunning oval nearly 10 carat genuine alexandrite – a rare color-change Alexandrite of this
Category

2010s Sri Lankan Loose Gemstones

Materials

Alexandrite

1.84 Carat Brazilian Alexandrite Diamond Platinum Pendant, GIA Certified
Located in Beverly Hills, CA
, the stone is certified by the GIA as natural and coming from Brazil, one of the finest alexandrite
Category

21st Century and Contemporary American Pendant Necklaces

Materials

Alexandrite, Diamond, Platinum

0.66 Carat Brazilian Alexandrite Diamond Platinum Ring, GIA Certified
Located in Beverly Hills, CA
blue-green color to a rich purple-pink. It is certified by the GIA as natural with a Brazilian origin
Category

21st Century and Contemporary American Fashion Rings

Materials

Alexandrite, Diamond, Platinum

1.14 Carat Brazilian Alexandrite Diamond Platinum Ring, GIA Certified
Located in Beverly Hills, CA
piece is elegant and modern, suitable for any occasion. Certified by the GIA as natural with a Brazilian
Category

21st Century and Contemporary American Contemporary Fashion Rings

Materials

Alexandrite, Diamond, Platinum

GIA Report Certified Brazilian 3.29 Carat Natural Alexandrite Ring
Located in New York, NY
light. This piece will be accompanied by a certificate from GIA. Alexandrite:3.29 ct Diamond: 1.60 ct
Category

2010s Japanese Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

GIA Report Certified Brazilian 2.29 Carat Natural Alexandrite Ring
Located in New York, NY
light. This piece will be accompanied by a certificate from GIA. Alexandrite:2.29 ct Diamond: 0.66 ct
Category

2010s Japanese Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

Superb 6.61 Carat Alexandrite Diamond Platinum Ring, GIA Certified
Located in Beverly Hills, CA
that, it is certified by the GIA as natural with no treatment of any kind. It is complemented by 1.76
Category

21st Century and Contemporary American Fashion Rings

Materials

Alexandrite, Diamond, Platinum

8.29ct Alexandrite Diamond Platinum 3-Stone Ring, GIA Certified
Located in Beverly Hills, CA
A large and difficult to source natural Alexandrite weighing 8.29 carats. Stones over 3 carats are
Category

21st Century and Contemporary American Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 10.55 Carat Octagonal Alexandrite and Diamond Cocktail Ring
Located in Chicago, IL
our collection. It's GIA certified, measures 12.44 x 11.75 mm, and octagonal. This gem source is
Category

2010s American Contemporary Cocktail Rings

Materials

Alexandrite, White Diamond, Platinum

GIA Certified 0.48 Carat Natural Brazilian Alexandrite Loose Facetted Gemstone
Located in Los Angeles, CA
carats with GIA Report. Get in touch with your inner beauty with this gorgeous natural alexandrite
Category

21st Century and Contemporary Brazilian Loose Gemstones

Materials

Alexandrite

GIA Certified 4 Carat Cats Eye Alexandrite Diamond Engagement Ring
Located in Santa Barbara, CA
Weight: 8.0 grams Includes: GIA Alexandrite Origin Report #6224476132 Certified Appraisal $35,000
Category

1990s Contemporary Engagement Rings

Materials

Alexandrite, Diamond, 18k Gold, White Gold

7.81 Carat Alexandrite Diamond 18k White Gold Ring, GIA Certified
Located in Beverly Hills, CA
in 18k white gold, certified by the GIA as natural with no treatment, this fine alexandrite ring is
Category

21st Century and Contemporary American Fashion Rings

Materials

Alexandrite, Diamond, 18k Gold, White Gold

Peter Suchy GIA Certified 1.36 Carat Alexandrite Diamond Platinum Dangle Earring
By Peter Suchy
Located in Stamford, CT
circa 1880-1890. Designed and created in the Peter Suchy workshop. Both alexandrite are GIA Certified
Category

21st Century and Contemporary Dangle Earrings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 0.89 Carat Natural Brazilian Alexandrite Ring Set in Platinum
Located in Tokyo, JP
A gorgeous ring featuring a GIA Certified 0.89 Carat, Natural Brazilian Alexandrite and 0.34 Carats
Category

20th Century Japanese Modern Engagement Rings

Materials

Alexandrite, Diamond, Platinum

Art Deco Platinum Diamond GIA Certified 1.55 Carat Alexandrite Engagement Ring
Located in Los Angeles, CA
% Platinum, 10% Iridium. Stones- 1 GIA Certified Oval Alexandrite 1.55 Carats, 23 Round Old European Cut
Category

2010s American Art Deco Engagement Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 1.87 Carat Cushion Cut Alexandrite Diamond and Platinum Ring
Located in Towson, MD
; however, we do not offer this service online. GIA Certified #2203558270
Category

Vintage 1950s Unknown Retro Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

Art Deco Platinum Diamond GIA Certified 1.55 Carat Alexandrite Engagement Ring
Located in Los Angeles, CA
% Platinum, 10% Iridium. Stones- 1 GIA Certified Oval Alexandrite 1.55 Carats, 23 Round Old European Cut
Category

2010s American Art Deco Engagement Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 3.00 Carat Oval Alexandrite Diamond Halo Gold Engagement Ring
Located in Stamford, CT
Alexandrite and diamond engagement ring. GIA and AGL certified natural oval 3.00 certified center
Category

21st Century and Contemporary Engagement Rings

Materials

Alexandrite, Diamond, Gold, 18k Gold, White Gold

18K Yellow Gold Ballerina Diamond GIA Certified 4.21 Carat Alexandrite Ring
Located in Los Angeles, CA
an Elongated Oval Alexandrite that is GIA Certified Surrounded By Round and Baguette Diamonds. The
Category

21st Century and Contemporary American Art Deco Engagement Rings

Materials

Alexandrite, Diamond, Yellow Gold

GIA Certified 0.60 Carat Natural Color Changing Alexandrite and Diamond Pendant
By Alberto
Located in GREAT NECK, NY
Carats - Measuring 4.78 x 4.83 x 3.19 mm GIA Certified Diamond Details: 6 Brilliant White Diamonds at
Category

2010s American Contemporary Pendant Necklaces

Materials

Alexandrite, Diamond, White Diamond, 18k Gold, Yellow Gold

GIA Certified 4.60 Carat Natural Color Changing Alexandrite and Diamond Ring
By Alberto
Located in GREAT NECK, NY
4.60 Carats - Measuring 11.86 x 9.29 x 4.26 mm GIA Certified Diamond Details: 88 Brilliant White
Category

2010s American Contemporary Cocktail Rings

Materials

Alexandrite, Diamond, White Diamond, 14k Gold, White Gold

GIA Certified 0.69 Carat Natural Gem Quality Brazilian Alexandrite Platinum Ring
Located in Los Angeles, CA
Our certified Brazilian Alexandrite Platinum Ring is the best quality and value for money
Category

21st Century and Contemporary American Art Nouveau Engagement Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 1.42 Carat Brazilian Alexandrite and Diamond Ring Made in Platinum
Located in Tokyo, JP
A gorgeous ring featuring GIA Certified 1.42 Carat, Natural Brazilian Alexandrite and 2.30 Carats
Category

21st Century and Contemporary Japanese Modern Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 0.43 Carat Brazilian Alexandrite and Diamond Ring set in Platinum
Located in Tokyo, JP
A gorgeous ring featuring GIA Certified 0.43 Carat, Nature Brazilian Alexandrite and 0.84 Carats of
Category

21st Century and Contemporary Japanese Modern Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 0.63 Carat Brazilian Alexandrite and Diamond Ring set in Platinum
Located in Tokyo, JP
A gorgeous ring featuring GIA Certified 0.63 Carat, Nature Brazilian Alexandrite and 0.24 Carats of
Category

21st Century and Contemporary Japanese Modern Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 0.86 Carat Brazilian Alexandrite and Diamond Ring set in Platinum
Located in Tokyo, JP
A gorgeous ring featuring GIA Certified 0.86 Carat, Nature Brazilian Alexandrite and 0.50 Carats of
Category

21st Century and Contemporary Japanese Modern Engagement Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 1.38 Carat Brazilian Alexandrite and Diamond Ring Set in Platinum
Located in Tokyo, JP
A gorgeous ring featuring a GIA Certified 1.38 Carat, Natural Brazilian Alexandrite and 0.53 Carats
Category

21st Century and Contemporary Japanese Modern Engagement Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 1.39 Carat, Brazilian Alexandrite and Diamond Ring Set in Platinum
Located in Tokyo, JP
A gorgeous Ring featuring a GIA Certified 1.39 Carat, Natural Alexandrite and 2.40 Carats of
Category

21st Century and Contemporary Japanese Modern Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 0.92 Carat Brazilian Alexandrite and Diamond Ring set in Platinum
Located in Tokyo, JP
A gorgeous ring featuring a GIA Certified 0.92 Carat, Natural Brazilian Alexandrite and 0.31 Carats
Category

20th Century Japanese Modern Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 0.51 Carat Brazilian Alexandrite and Diamond Ring Made in Platinum
Located in Tokyo, JP
A gorgeous ring featuring GIA Certified 0.51 Carat, Natural Brazilian Alexandrite and 0.63 Carats
Category

21st Century and Contemporary Japanese Modern Cluster Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 2.00 Carat Natural Color-Changing Alexandrite Ring Set in Platinum
Located in Tokyo, JP
A gorgeous ring featuring a 2.00 Carat, Natural Alexandrite and 0.34 Carats of Diamond Accents set
Category

21st Century and Contemporary Japanese Modern Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

14K Yellow Gold Halo Diamond GIA Certified 3 Carat Oval Alexandrite Earrings
Located in Los Angeles, CA
Yellow Gold, .583. GIA Report Number 5234326889 Stones- Two Oval Matching Alexandrites 3.00 Carats, 36
Category

21st Century and Contemporary American Art Deco Drop Earrings

Materials

Alexandrite, Diamond, 14k Gold, Yellow Gold

GIA Certified 1.21 Carat Alexandrite and 1.50 Carat Diamonds Set in Platinum
Located in Trumbull, CT
Platinum. You can see color change on the GIA Cert which is on the one of the photo or you can log in to
Category

Antique Mid-19th Century American Artisan Engagement Rings

Materials

Alexandrite, Diamond, Platinum

6.53 Carat GIA Cert Alexandrite Diamond Gold Ring
Located in Miami, FL
18K White Gold Ring Featuring a 6.53ct GIA Certified Cushion Cut Alexandrite Accented by
Category

21st Century and Contemporary American More Rings

Materials

Alexandrite, Diamond, 18k Gold

Natural Alexandrite 3.29 cts Sri Lanka Origin GIA Cert Diamond Necklace
Located in Beverly Hills, CA
Diamond Trillions Cuts on Each Side . Gia certified Report Number 110189930363 Oval Alexandrite 3.29 cts
Category

1990s Japanese Pendant Necklaces

Materials

Alexandrite, Diamond, Platinum

Natural Alexandrite Diamond Gold Hinged Bracelet
Located in Stamford, CT
Natural Alexandrite untreated GIA certified color change hinged bracelet with full cut diamonds
Category

1990s More Bracelets

Materials

Alexandrite, Diamond, 14k Gold, Yellow Gold

GIA Certified Alexandrite Oval Color Changing Diamond Halo Split Shank Ring 14k
Located in GREAT NECK, NY
Material: 14K Rose Gold Center Stone Details: 1 Oval Alexandrite at 1.06 Carats - GIA Certificate
Category

2010s American Contemporary Engagement Rings

Materials

Alexandrite, Diamond, Rose Gold, 14k Gold

1.27ct Oval Yellowish Green to Yellowish Brown Alexandrite GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Alexandrite The GIA report reads as follows: GIA Report Number
Category

2010s Sri Lankan Contemporary Loose Gemstones

Materials

Alexandrite

Stunning 2.51ct Alexandrite Gemstone - GIA Certified
Located in רמת גן, IL
Stunning 2.51ct Alexandrite Gemstone - GIA Certified This stunning 2.51-carat oval Alexandrite
Category

2010s Israeli Loose Gemstones

Materials

Alexandrite

GIA Certified 8.41 Carat Natural Color Change Alexandrite
Located in New York, NY
This stunning oval 8.41 carat genuine alexandrite – a rare color-change variety of chrysoberyl – is
Category

2010s Sri Lankan Loose Gemstones

Materials

Alexandrite

Alexandrite Oval, .86 Carat Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This .86 carat, GIA-certified oval alexandrite is the perfect shape for a 3-stone ring! It exhibits
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Alexandrite, Chrysoberyl

GIA Certified 1.90 Carat Alexandrite and Diamond Ring
Located in Trumbull, CT
Natural GIA Certified Pear shape 1.90 Carat Alexandrite and round white diamonds 0.63 Carat set in
Category

21st Century and Contemporary American Art Deco Engagement Rings

Materials

Alexandrite, 18k Gold

Alexandrite Ring with Diamonds is Rare Even Among Alexandrite Rings
Located in Northampton, MA
they're backlit by the sun. This GIA certified alexandrite measures 7.11 mm x 5.93 mm and has a depth of
Category

Early 2000s American Contemporary Cocktail Rings

Materials

Alexandrite, Diamond, Platinum

Alexandrite Chrysoberyl .78 Carat Loose Gemstone, GIA Certified - RTP
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This .78 carat alexandrite chrysoberyl is a gorgeous teal green color in fluorescent/daylight with
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Alexandrite, Chrysoberyl

2.14 Carat Ceylon Alexandrite Diamond Platinum Halo Ring, GIA Certified
Located in Beverly Hills, CA
. Certified by the GIA as natural with no treatment. Ring Size: 6.25 Weight: 9.0 grams
Category

21st Century and Contemporary American Contemporary Fashion Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 2.63 Carat Natural Color-Change Brazilian Alexandrite Ring
Located in Tokyo, JP
A gorgeous ring featuring a GIA Certified 2.63 Carat, Natural Brazilian Alexandrite and 1.96 Carats
Category

21st Century and Contemporary Japanese Modern Cluster Rings

Materials

Alexandrite, Diamond, Platinum

GIA Certified 2.52 Carat Oval Natural Alexandrite Diamond Platinum Ring
Located in Houston, TX
This beautiful 2.52ct Oval natural Alexandrite shows a lovely color change from Yellowish Green
Category

21st Century and Contemporary American Fashion Rings

Materials

Alexandrite, Diamond, Platinum

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Gia Certified Alexandrite For Sale on 1stDibs

You are likely to find exactly the gia certified alexandrite you’re looking for on 1stDibs, as there is a broad range for sale. Frequently made of Gold, White Gold and 18k Gold, this item was constructed with great care. You can easily find a 3 antique edition and 31 modern creations to choose from as well. You’re likely to find the perfect gia certified alexandrite among the distinctive items we have available, which includes versions made as long ago as the 20th Century as well as those produced as recently as the 21st Century. For this particular accessory, there are many different carat weights to choose from, but 1.5 Carat and 2 Carat versions are of considerable interest. Creating a gia certified alexandrite has been a part of the legacy of many jewelers, but those produced by Alberto, Beyond Fine Jewelry and Claude Morady Estate Jewelry are consistently popular. An oval cut version of this piece has appeal, but there are also cushion cut and pear cut versions for sale. When shopping for a gia certified alexandrite, you’ll find that there are less available pieces for unisex or men today than there are for women.

How Much is a Gia Certified Alexandrite?

On average, a gia certified alexandrite at 1stDibs sells for $18,950, while they’re typically $3,995 on the low end and $89,890 for the highest priced versions of this item.

Finding the Right Rings for You

Antique and vintage rings have long held a special place in the hearts of fine jewelry lovers all over the world.

No matter their origin or specific characteristics, rings are timeless, versatile accessories. They’ve carried deep meaning since at least the Middle Ages, when diamond rings symbolized strength and other kinds of rings were worn to signify romantic feelings or to denote an affiliation with a religious order. Rings have also forever been emblematic of eternity.

Over time, rings have frequently taken the form of serpents, which have long been associated with eternal life, health and renewal. Italian luxury jewelry house Bulgari has become famous for its widely loved Serpenti motif, for example, and its Serpenti ring, like the other accessories in the collection, began as an homage to jewelry of the Roman and Hellenistic eras. The serpent is now a popular motif in fine jewelry. Jewelry devotees have long pined for rings adorned with reptiles, thanks to antique Victorian rings — well, specifically, Queen Victoria’s illustrious engagement ring, which took the form of a gold snake set with rubies, diamonds and an emerald (her birthstone). Designs for Victorian-era engagement rings often featured repoussé work and chasing, in which patterns are hammered into the metal.

Engagement rings, which are reliably intimidating to shop for, are still widely recognized as symbols of love and commitment. On 1stDibs, a range of buying guides can be found for those in the market for antique engagement ringsvintage engagement rings or Art Deco engagement rings

The most collectible antique engagement rings and vintage engagement rings are those from the Victorian, Edwardian and Art Deco eras. Named for the monarchies of the four King Georges, who in succession ruled England starting in 1714 (plus King William’s reign), antique Georgian rings, be they engagement rings or otherwise, are also coveted by collectors. Pearls, along with colored gemstones like garnets, rubies and sapphires, were widely used in Georgian jewelry. The late-1700s paste jewelry was a predecessor to what we now call fashion or costume jewelry

The Art Nouveau movement (1880–1910) brought with it rings inspired by the natural world. Antique Art Nouveau rings might feature depictions of winged insects and fauna as well as women, who were simultaneously eroticized and romanticized, frequently with long flowing hair. Art Deco jewelry, on the other hand, which originated during the 1920s and ’30s, is by and large “white jewelry.” White metals, primarily platinum, were favored over yellow gold in the design of antique Art Deco rings and other accessories as well as geometric motifs, with women drawn to the era’s dazzling cocktail rings in particular.

Whether you’re hunting down a chunky classic for a Prohibition-themed cocktail party or seeking a clean contemporary design to complement your casual ensemble, find an exquisite collection of antique, new and vintage rings on 1stDibs.

Questions About Gia Certified Alexandrite
  • 1stDibs ExpertApril 5, 2022
    You can tell if alexandrite is real by looking at the size and clarity of the stone. Large and clear alexandrite is extremely rare, which means finding a real one like this is doubtful. Synthetic alexandrites often contain spherical bubbles or tadpole inclusions. You’ll also want to check the color change, as real alexandrite changes from a greenish hue to something that’s reddish Shop a collection of alexandrite jewelry from some of the world’s top sellers on 1stDibs.
  • 1stDibs ExpertApril 5, 2022
    Yes, Cartier diamonds are indeed GIA certified. The Gemological Institute of America (GIA) works closely with Cartier and certifies everything from the cut and clarity to the color of the gem. Shop a collection of expertly vetted Cartier jewelry from some of the world’s top sellers on 1stDibs.
  • 1stDibs ExpertFebruary 22, 2021
    When a diamond is GIA certified, it means that the stone has undergone the meticulous set of grading procedures that have been established by the Gemological Institute of America. The GIA is not a jeweler — it is an independent, nonprofit group that sets the standards for determining the quality of a diamond.
  • 1stDibs ExpertAugust 17, 2021
    In the United States, diamond rings are certified by an official gemological laboratory known as the Gemological Institute of America. A certified diamond ring means that the diamond has undergone a quality analysis by experts at an institution such as the GIA and these experts have issued a lab report that is indicative of the grading process.
  • 1stDibs ExpertMarch 22, 2022
    Whether Neil Lane diamonds are GIA-certified or not depends on the piece. All of the diamonds featured in rings and other jewelry designs from the Neil Lane Couture collection do carry GIA certification. Pieces made for third-party retailers may not. On 1stDibs, find a collection of Neil Lane jewelry.
  • 1stDibs ExpertFebruary 13, 2023
    While diamond studs don't need to be GIA-certified to be sold, experts typically recommend that you only purchase diamonds that carry certification from the Gemological Institute of America (GIA) or Authentic Gem Security Lab (AGSL). Certifications bring transparency to the buying process, allowing you to know the level of quality of a diamond before you purchase it. Shop a collection of vintage and modern diamond gemstone earrings from some of the world’s top jewelers on 1stDibs.
  • 1stDibs ExpertAugust 15, 2024
    Many experts believe that buying a GIA-certified diamond is worth it. The Gemological Institute of America (GIA) has a well-established reputation for providing accurate, trustworthy ratings and certifications. A diamond that carries a GIA certification has undergone rigorous examinations and tests to assess its quality, which can make it a good investment. Find a diverse assortment of diamond jewelry on 1stDibs.