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Used Gia Certified Diamonds

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GIA Certified 3.00 Ct FLAWLESS / D color 18K Gold Solitarie Ring
Located in New Delhi, Delhi
come in 18k gold with a lustrous GIA Certified Diamond of 3,00 carats , Flawless clarity , D color
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 2.63 Carat Diamonds Yellow Gold Platinum Dangle Earrings
Located in Stamford, CT
Early 1900's Old European brilliant cut diamond dangle earrings. 2 GIA certified diamonds set in
Category

Early 20th Century Used Gia Certified Diamonds

Materials

Diamond, Gold, 18k Gold, Yellow Gold, Platinum

GIA Certified 4.00 Carats E/VS1 Round Brillant Shape Diamond 18K Gold Necklace
Located in New Delhi, Delhi
necklace come in 18k gold with lustrous GIA Certified Diamond o 4,00 carats, in perfect round brillant
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 20.00 Carats F/VS1 Pear Shape Diamonds Platinum Gold Earrings
Located in New Delhi, Delhi
in platinum with 2 pieces of lustrous GIA Certified Diamonds of 10,00 carats + 10,00 carats= 20,00
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 3.00 Carat F/VS1 Heart Shape Diamond 18K Gold Solitaire Ring
Located in New Delhi, Delhi
in 18k gold with dazzling GIA Certified Diamond of 3,00 carat, in perfect heart shape, F color , VS
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

Emerald Cut Diamond Tennis Line Bracelet
By Diamond Scene New York
Located in New York, NY
A SENSATIONAL bracelet! A beautiful layout of GIA Certified diamonds, all with ideal measurements
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 5.00 Carats F/VS1 Marquise Shape Diamonds 18K Gold Ring
Located in New Delhi, Delhi
Certified Diamond of 5,00 carats, F color VS1 clarity, very sparkly, and surrounded by dazzling round
Category

21st Century and Contemporary Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified Natural Diamond 14K 585 Yellow Gold Pendant
Located in New York, NY
GIA Certified Diamond Pendant Saatchi&Co is delighted to showcase this exquisite piece. Please
Category

Mid-20th Century Contemporary Used Gia Certified Diamonds

Materials

Diamond, 14k Gold, Yellow Gold

1.01 Carat Cushion Cut Diamond I/VS2 GIA Halo Engagement Ring
Located in New York, NY
coverage for a great price. GIA certified diamond of I color VS2 clarity, near colorless and very slightly
Category

21st Century and Contemporary American Modern Used Gia Certified Diamonds

Materials

Diamond, 18k Gold, White Gold

GIA Certified 3.00 Carats FLAWLESS Clarity D Color 18K Gold Solitarie Ring
Located in New Delhi, Delhi
Gold with a lustrous GIA Certified Diamond of 3,00 carats , in perfect radiant shape , D color
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified Fancy Light Yellow Cushion Diamond 3.50 Carat TW Gold Earrings
Located in New York, NY
RareGemWorld's beautiful GIA certified diamond earrings. Mounted in a beautiful 18K Yellow Gold
Category

21st Century and Contemporary Contemporary Used Gia Certified Diamonds

Materials

Diamond, Yellow Diamond, Gold, 18k Gold, Yellow Gold

GIA Certified 6.00 Ct F/VVS1 Marquise Shape Diamonds 18K Gold Earrings
Located in New Delhi, Delhi
in 18k gold with 2 pieces of lustrous GIA Certified Diamonds of 3,00 cts + 3,00 cts =6,00 cts in
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 5 Carat D Color Flawless Radiant Cut Diamond Ring
By Antinori Fine Jewels
Located in Chicago, IL
Exquisite in every detail, this captivating ring features a radiant-cut GIA-certified diamond at
Category

2010s Unknown Modern Used Gia Certified Diamonds

Materials

Diamond, Gold, 18k Gold, White Gold

GIA Certified 11.00 Carats D/VVS1 Oval Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
you go. Magnificent ring come in 18k gold with a lustrous GIA Certified Diamond of 11,00 carats, in
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

Platinum Chandelier Earrings with Pear Shape and Marquise Diamonds
By Diana M. Jewels
Located in New York, NY
Platinum diamond chandelier earrings with 5 gia certified diamonds, features 30.50ct of round, pear
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 1.70 Carat Round Double Halo Split Shank Diamond Ring
By EMD Diamonds
Located in New York, NY
weighing 1.70 is beautifully set in white gold. The GIA-certified diamond boasts an exquisite J and SI1
Category

21st Century and Contemporary American Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Gold

GIA Certified 1.20 Carat Oval Diamond Engagement Platinum Ring
Located in Chicago, IL
This exquisite 1.20ct GIA Certified diamond engagement ring features a stunning oval-shaped center
Category

2010s American Art Deco Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 5.00 Carats F/VVS2 Princess Shape Diamond 18K Gold Solitaire Ring
Located in New Delhi, Delhi
lustrous GIA Certified Diamond of 5,00 carats , in a perfect princess shape, F color VVS2 clarity, very
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 1.52 Carat Round Double Halo Split Shank Diamond Ring
By EMD Diamonds
Located in New York, NY
weighing 1.52 is beautifully set in white gold. The GIA-certified diamond boasts an exquisite I and I1
Category

21st Century and Contemporary American Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Gold

GIA Certified 1.81 Carat Round Double Halo Split Shank Diamond Ring
By EMD Diamonds
Located in New York, NY
weighing 1.81 is beautifully set in yellow gold. The GIA-certified diamond boasts an exquisite J and VS2
Category

21st Century and Contemporary American Contemporary Used Gia Certified Diamonds

Materials

Diamond, Yellow Gold

Art Deco GIA Certified 0.50 Carat Diamond Ruby Platinum Engagement Ring
Located in Hong Kong, HK
platinum for lasting beauty and strength. At its heart lies a resplendent GIA certified diamond, weighing
Category

21st Century and Contemporary Hong Kong Art Deco Used Gia Certified Diamonds

Materials

Diamond, Ruby, Platinum

GIA Certified 5.00 Carats FLAWLESS clarity E color 18K Gold Solitaire Ring
Located in New Delhi, Delhi
gold with a lustrous GIA Certified Diamond of 5.00 carats, FLAWLESS clarity, so sparkly , E color , in
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

1.41ct GIA certified fancy yellow diamond loose
Located in Boca Raton, FL
GIA certified diamond, beautiful fancy yellow, comes with box and papers! Natural Color Diamond
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Yellow Diamond

AIG Certified 4.00 Carat Zambian Emerald GIA Diamonds 18K Gold Ring
Located in New Delhi, Delhi
of side GIA Certified Diamonds of 0,30 x 2=0,60 , D color VS2 clarity, very sparkly , and 52 pieces
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Emerald, 18k Gold

GIA Certified 0.50 Carat F Colour VVS1 Clarity Diamond
Located in บางรัก, TH
remains a top choice for those seeking brilliance and elegance. Also, GIA certified diamond is that has
Category

2010s Asian Used Gia Certified Diamonds

Materials

Diamond

GIA Certified 7.90 Carats Flawless D Color Marquise Shape Diamonds 18K Gold Ring
Located in New Delhi, Delhi
come in 18k gold with lustrous GIA Certified Diamond of 7,90 carats , in perfect marquise shape, D
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

Striking 7.64 Ct GIA Certified Zambian Emerald and Diamond Ring
By Hakimi s Gem
Located in Chicago, IL
versatile wear. -Emerald: Emerald-cut, 6.89 carats, GIA certified -Diamonds: 2 bullet-cut, 0.75 carats
Category

21st Century and Contemporary Modern Used Gia Certified Diamonds

Materials

Diamond, Emerald, Platinum

GIA Certified Natural Fancy Yellow and White Diamond "Toi et Moi" Crossover Ring
Located in Los Angeles, CA
karat yellow gold, Natural Fancy Intense Yellow & White GIA certified diamonds. Featuring a 1.59 Carat
Category

21st Century and Contemporary American Modern Used Gia Certified Diamonds

Materials

Diamond, 18k Gold, Platinum

Peter Suchy GIA Certified 5.03 Carat Sapphire Diamond Platinum Dangle Earrings
By Peter Suchy
Located in Stamford, CT
Sapphire and diamond dangle earrings. 2 deep blue oval GIA certified sapphires with 2 oval GIA
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

Brilliant 1.41ct Pair of Round-Shaped Diamonds - GIA Certified
Located in רמת גן, IL
Brilliant 1.41ct Pair of Round-Shaped Diamonds - GIA Certified A dazzling duo of perfectly matched
Category

2010s Israeli Used Gia Certified Diamonds

Materials

Diamond

Certified 2.03 Carat Three-Stone Engagement Ring, with Two GIA Emeralds
Located in New York, NY
emerald cut features 2.03 cts J/VS1. Side GIA certified diamonds features 1.01 ct I/VS1 and 1.00ct I/VS1
Category

21st Century and Contemporary American Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 2.20 Carat Round Double Halo Split Shank Diamond Ring
By EMD Diamonds
Located in New York, NY
-certified diamond boasts an exquisite H and SI1 , ensuring exceptional brilliance and clarity that will
Category

21st Century and Contemporary American Contemporary Used Gia Certified Diamonds

Materials

Diamond, Yellow Gold

1.50ct GIA certified Heart diamond Fancy Intense Yellow
Located in Boca Raton, FL
GIA certified diamond, natural fancy intense yellow diamond weighing 1.50ct. Natural Color Diamond
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Yellow Diamond

Beautiful 4.02 Carat GIA Certified Natural Burma Ruby and Diamond Ring, Platinum
By Hakimi s Gem
Located in Chicago, IL
GIA certified pear-shaped diamonds totaling 1.00 carat. The ruby is heat-treated and displays
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Ruby, Platinum

GIA Certified 24 Carat White Brilliant Cut Tennis Diamond Bracelet
By Antinori Fine Jewels
Located in Chicago, IL
luxurious 18kt white gold, this stunning piece features 29 GIA-certified diamonds totaling 24 carats. Each
Category

2010s Unknown Contemporary Used Gia Certified Diamonds

Materials

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

GIA Certified Natural Yellow Pear Diamond 1.52 Carat TW Gold Cocktail Ring
Located in New York, NY
RareGemWorld's beautiful GIA certified diamond ring. Mounted in a beautiful 18K Yellow and White
Category

21st Century and Contemporary Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Diamond, Yellow Diamond, Gold, 18k Gold, White Gold, Yell...

GIA Certified Natural Yellow Radiant Diamond 1.04 Carat TW Gold Cocktail Ring
Located in New York, NY
RareGemWorld's beautiful GIA certified diamond ring. Mounted in a beautiful 18K Yellow Gold setting
Category

21st Century and Contemporary Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Diamond, Yellow Diamond, Gold, 18k Gold, White Gold, Yell...

14K Yello White Gold Mix Shapes GIA Certified Designer Diamond Ring 1.25 CT. TW
Located in San Francisco, CA
diamonds are GIA certified. Diamond Number 1: Shape: Marquise Weight : 0.36 Carat Color: H Clarity: VVS2
Category

21st Century and Contemporary American Used Gia Certified Diamonds

Materials

Diamond, 14k Gold, White Gold

GIA Certified 2.50 Carats D/VVS1 Heart Shape Diamonds 18K Gold Solitaire Ring
Located in New Delhi, Delhi
solitaire ring come in 18k gold with lustrous GIA Certified Diamond of 2,50 carats, in perfect heart shape
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

Huge Loose GIA certified heart brilliant diamond 4.57ct
Located in Boca Raton, FL
GIA certified diamond, stunning heart brilliant 4.57 carats! Natural Diamond: Color: Fancy Yellow
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond

1.12 Fancy Pink diamond GIA certified Beautiful sparkle!
Located in Boca Raton, FL
GIA certified diamond, natural fancy pink color 1.12 carats! Natural Color Diamond: Color: Fancy
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Pink Diamond

Bespoke GIA Square Pear 19.38 Carat Yellow White Platinum Diamond Drop Earrings
By Hasbani Diamonds
Located in London, GB
- Cornered Rectangular Modified Brilliant GIA Certified Diamonds Y to Z in color with VS1 to VVS2 clarity
Category

2010s British Modern Used Gia Certified Diamonds

Materials

Diamond, White Diamond, Yellow Diamond, Platinum

GIA Certified Natural Yellow Cushion Diamond 2.10 Carat TW Gold Drop Earrings
Located in New York, NY
RareGemWorld's beautiful GIA certified diamond earrings. Mounted in a beautiful 18K Yellow and
Category

21st Century and Contemporary Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Diamond, Yellow Diamond, Gold, 18k Gold, White Gold, Yell...

GIA Certified 1.01 Carat D Color VS2 Clarity Heart Shape Diamond
Located in Los Angeles, CA
GIA Certified Diamond Shape- Heart Brilliant Diamond Carat Weight- 1.01 Color- D Clarity- VS2
Category

21st Century and Contemporary Unknown Modern Used Gia Certified Diamonds

Materials

Diamond

GIA Certified 10.00 Carat Natural Diamonds 18k Gold Flower Ring
Located in New Delhi, Delhi
pieces of GIA Certified Diamonds of 2 carat each , in pear cut, 10,00 carats in total , H color VS
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 4.07 Carat Old Europeana Cut Diamond Engagement Platinum Ring
Located in Chicago, IL
original vintage, GIA certified diamond with an impressive size of 4.07 carats, showcasing a gorgeous old
Category

2010s American Contemporary Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 2.01 Carat Cushion Diamond Halo White Gold Pendant Necklace
By EMD Diamonds
Located in New York, NY
gold, this GIA certified diamond pendant necklace features a 2.01 carat cushion cut natural diamond
Category

21st Century and Contemporary American Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Gold

GIA Certified 1.5 Carat Cushion Diamond Halo Yellow Gold Pendant Necklace
By EMD Diamonds
Located in New York, NY
gold, this GIA certified diamond pendant necklace features a 1.50 carat cushion cut natural diamond
Category

21st Century and Contemporary American Contemporary Used Gia Certified Diamonds

Materials

Diamond, Yellow Gold

GIA Certified 0.50 Carat E Colour VVS1 Clarity Diamond
Located in บางรัก, TH
, a 0.50 carat diamond symbolizes sophistication and timeless beauty. Also, GIA Certified Diamond is
Category

2010s Asian Used Gia Certified Diamonds

Materials

Diamond

GIA Certified 0.51 Carat G Colour vs2 Clarity Diamond
Located in บางรัก, TH
, fluorescence, and proportions. A GIA certified diamond guarantees that the stone is natural and not
Category

2010s Asian Used Gia Certified Diamonds

Materials

Diamond

GIA Certified Heart Shaped Pendant
By Issac Nussbaum
Located in New York, NY
Exquisite GIA certified diamond heart shape pendant necklace. This dazzling heart shape diamond
Category

2010s American Modern Used Gia Certified Diamonds

GIA Certified 0.50 Carat H Colour vvs1 Clarity Diamond
Located in บางรัก, TH
Certified Diamond is that has been graded and verified by the Gemological Institute of America (GIA), one of
Category

2010s Asian Used Gia Certified Diamonds

Materials

Diamond

GIA Certified 0.70 Carat D Colour VS2 Clarity Diamond
Located in บางรัก, TH
like VVS or IF, making it a desirable and timeless option. Also, GIA certified diamond is that has
Category

2010s Asian Used Gia Certified Diamonds

Materials

Diamond

GIA Certified 3.40 Carats Emerald Cut Diamond Earrings in 18 Karat White Gold
By Rewa Jewellery
Located in Bangkok, TH
These GIA-certified diamond earrings feature two emerald-cut diamonds with a combined weight of
Category

2010s Used Gia Certified Diamonds

Materials

Diamond, Emerald, Gold, 18k Gold, White Gold

Estate GIA Certified Fancy Yellow Pear Shaped Diamond Necklace
Located in Scottsdale, AZ
Estate GIA certified fancy yellow pear shaped diamond necklace. Centering one fancy yellow pear
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Yellow Diamond

GIA Certified 31 Carat Oval Diamond Bracelet
By Antinori Fine Jewels
Located in Chicago, IL
dazzling array of GIA certified oval diamonds. Each oval diamond is meticulously set in a basket claw prong
Category

2010s Unknown Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Diamond, Platinum

5 Carat GIA Light Yellow Elongated Radiant Diamond Three Stone Ring
By Rare Colors
Located in New York, NY
Size 6.5 GIA certified diamond Making Extraordinary Attainable with Rare Colors
Category

2010s American Used Gia Certified Diamonds

Materials

Diamond, Yellow Diamond, 18k Gold, Platinum

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Used Gia Certified Diamonds For Sale on 1stDibs

On 1stDibs, there are many options to choose from in our inventory of used gia certified diamonds. These distinct designs — crafted with great care and often made from Gold, Platinum and 18k Gold — can elevate any look. Find a collection of 2461 vintage versions or 9444 modern creations for a more contemporary example of these cherished accessories. Our inventory is broad and distinctive, with accessories on offer that were made as long ago as the 18th Century to those produced as recently as the 21st Century. The designs in our inventory of used gia certified diamonds bearing Modern or Contemporary hallmarks are very popular. Antinori Fine Jewels, Roman Malakov and Peter Suchy each produced beautiful examples of these items that are worth considering. Today, if you’re looking for round cut used gia certified diamonds and are unable to find the perfect match, our selection also includes oval cut and cushion cut alternatives. There aren’t many items for men in our collection of used gia certified diamonds, as most of the options available are for women.

How Much are Used Gia Certified Diamonds?

On average, used gia certified diamonds at 1stDibs sell for $22,343, while they’re typically $1 on the low end and $475,940,000 for the highest priced versions of this item.

The Legacy of Diamond in Jewelry Design

Antique diamond rings, diamond tiaras and dazzling vintage diamond earrings are on the wish lists of every lover of fine jewelry. And diamonds and diamond jewelry are primarily associated with storybook engagements and red-carpet grand entrances — indeed, this ultra-cherished gemstone has a dramatic history on its hands.

From “A Diamond Is Forever” to “Diamonds Are a Girl’s Best Friend,” pop culture has ingrained in our minds that diamonds are the most desired, the most lasting and the most valuable gemstone. But what makes the diamond so special? Each stone — whether it’s rubies, sapphires or another stone — is unique and important in its own right. April babies might claim diamonds for themselves, but just about everyone wants this kind of sparkle in their lives!

There are several factors that set diamonds apart from other stones, and these points are important to our gem education.

Diamonds are minerals. They are made up of almost entirely of carbon (carbon comprises 99.95 percent; the remainder consists of various trace elements). Diamonds are the hardest gemstones, ranking number 10 on the Mohs Hardness Scale. Even its name, diamond, is rooted in the Greek adamas, or unconquerable. The only object that can scratch a diamond is another diamond. Diamonds are formed deep within the earth at very high temperatures (1,652–2,372 degrees Fahrenheit at depths between 90 and 120 miles beneath the earth’s surface) and are carried up by volcanic activity. Diamonds are quite rare, according to the Gemological Institute of America, and only 30 percent of all the diamonds mined in the world are gem quality.

In the 1950s, the Gemological Institute of America developed the 4Cs grading system to classify diamonds: clarity, color, cut and carat weight. Not all diamonds are created equal (there are diamonds, and then there are diamonds). The value of the diamond depends on the clarity (flawless diamonds are very rare but a diamond's value decreases if there are many blemishes or inclusions), color (the less color the higher the grade), cut (how the diamond’s facets catch the light, certain cuts of diamonds show off the stone better than others) and carat weight (the bigger, the better).

When you start shopping for a diamond engagement ring, always prioritize the cut, which plays the largest role in the diamond's beauty (taking the time to clean your diamond ring at least every six months or so plays a role in maintaining said beauty). And 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

Shop antique and vintage diamond rings, diamond necklaces and other extraordinary diamond jewelry on 1stDibs.  

Questions About Used Gia Certified Diamonds
  • 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.