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Used Gia Certified Diamonds

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GIA Certified 2.05 Carat Diamond Stud Earrings 14 Karat Gold
Located in New York, NY
Handcrafted GIA Certified Diamond Stud Earrings featuring 2.05 Carat Total Diamond Weight G-H / SI2
Category

2010s American Contemporary Used Gia Certified Diamonds

Materials

Diamond, 14k Gold, White Gold

GIA Certified 8.00 Carat G/VS2 Oval Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
lustrous GIA Certified Diamond of 8,00 carats , in perfect oval shape , G color VS2 clarity , very sparkly
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 1.00 Carat Heart Shape Diamond 18K Gold Cocktail Ring
Located in New Delhi, Delhi
with a GIA Certified Diamond of 1,00 Carat , in perfect heart cut , I color VS2 clarity , very sparkly
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

Diana M. Fancy Intense Yellow Diamonds 21.57ct Rounds VS GIA Natural Platinum
By Diana M. Jewels
Located in New York, NY
One of a kind platinum earrings adorned with GIA certified diamonds. The centerpiece comprises of
Category

21st Century and Contemporary American Modern Used Gia Certified Diamonds

Materials

Yellow Diamond, Platinum

GIA Certified 9.50 Carats F/VS1 Oval Shape Diamonds 18K Gold Ring
Located in New Delhi, Delhi
gold with 3 pieces of lustrous GIA Certified Diamonds of 3,50 carats + 3,00 carats + 3,00 carats = 9,50
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 4.00 Carats F/VS2 Emerald Shape Diamond 18K Gold Solitaire Rings
Located in New Delhi, Delhi
lustrous GIA Certified Diamond of 4,00 carats F color VS2 clarity, in perfect emerald shape, and dazzling
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Emerald, 18k Gold

GIA Certified 3.45 Carat Pear Round Brilliant Diamond Drop Platinum Earrings
Located in London, GB
These Beautiful GIA Certified Diamond Pear Shaped Drop Double Halo Earrings feature 2 GIA Pear
Category

2010s British Modern Used Gia Certified Diamonds

Materials

White Diamond, Diamond, Platinum

GIA Certified 15.00 Carat G/VS2 Natural Diamond 18K Gold Ring
Located in New Delhi, Delhi
come in 18k gold with a lustrous GIA Certified Diamond of 15,00 carats, in perfect shape, G color VS2
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

18k Gold

GIA Certified 2.30 Carat Pear Shaped Platinum Diamond Drop Halo Modern Earrings
Located in London, GB
These Beautiful GIA Certified Diamond Pear Shaped Drop Halo Earrings feature 2 GIA Pear Brilliant
Category

2010s British Modern Used Gia Certified Diamonds

Materials

White Diamond, Diamond, Platinum

GIA Certified 2.58ct Pear Shape Diamond 5.00ct Diamond Dangling Earrings
Located in New York, NY
This is a stunning pair of 18k white gold earrings. The earrings feature 2 sparkling GIA certified
Category

20th Century Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified Artdeco Asscher Diamond Studs
By M&V Vanguard Jewelry
Located in New York, NY
Diamond Earrings with Asscher Cut GIA Certified Diamonds 0.91 ct & 0.92 ct stones
Category

2010s American Art Deco Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 1.10 Carats Round Brilliant Cut G/SI1 Solitaire Ring 18K Gold
Located in New Delhi, Delhi
This ring sounds absolutely stunning! Featuring 1.10 carats of round brilliant cut GIA certified
Category

21st Century and Contemporary Italian Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified .90 Carat and .36 Carat Round Diamond Engagement Ring Platinum
Located in New York, NY
Modernist Solitaire & Accent. GIA Certified Diamond engagement ring. .90ct. Natural Round Cut
Category

2010s American Modernist Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 3.00 Carats FLAWLESS/ D Pear Shape Diamond 18K Gold Solitaire Ring
Located in New Delhi, Delhi
gold with a lustrous GIA Certified Diamond of 3,00 carats, D color( extra white) Flawless clarity, very
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 3.00 Carats FLAWLESS clarity D color Heart Shape Diamond Gold Ring
Located in New Delhi, Delhi
with a lustrous GIA Certified Diamond of 3,00 carats , FLAWLESS clarity , D color , in perfect Heart
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Gold

GIA Certified .59 Cart Round Cut Diamond Raised Crown Ring Flush 14 Karat
Located in New York, NY
GIA Certified Diamond engagement ring. Raised Crown, Flush mount GIA Certificate: 1152592795
Category

2010s American Used Gia Certified Diamonds

Materials

Diamond, 14k Gold, Yellow Gold

GIA Certified 6.00 Carats D/VVS2 Emerald Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
in 18k gold a lustrous GIA Certified Diamond of 6,00 carats, in perfect emerald shape , D color
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Emerald, 18k Gold

GIA Certified 5.00 Carats F/VS1 Round Brilliant Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
gold with a lustrous GIA Certified Diamond of 5,00 carats, in perfect round brillant shape, F color VS1
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 3.00 Carats D/VS2 Marquise Shape Diamonds 18K Gold Solitarie Ring
Located in New Delhi, Delhi
lustrous GIA Certified Diamond of 3,00 carats, in perfect shape, D color VS2 clarity, very sparkly, and
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 6.00 Carat Heart Shape Diamonds 18K Gold Double Ring
Located in New Delhi, Delhi
it speaks louder. Magnificent double ring come in 18k gold with 2 lustrous pieces of GIA Certified
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

0.66 Carat Oval Diamond F/VS1 GIA Engagement Ring
Located in New York, NY
This is a beautiful halo set oval cut diamond engagement ring crafted with 0.66 carat GIA certified
Category

21st Century and Contemporary American Modern Used Gia Certified Diamonds

Materials

Diamond, 14k Gold, White Gold

GIA Certified 8.00 Carats F/VS1 Emerald Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
gold with a lustrous GIA Certified Diamond of 8,00 carats , in perfect emerald shape , F color VS1
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Emerald, 18k Gold

GIA Certified Aquamarine Diamond Necklace in White Gold
Located in New York, NY
surrounded by a square halo of round brilliant diamonds weighing a total of 1.25cts. Aqua is GIA certified
Category

21st Century and Contemporary American Romantic Used Gia Certified Diamonds

Materials

Diamond, Aquamarine, White Gold

GIA Certified 3.00 Carats F/VS1 Diamonds 18k Gold Solitaire Ring
Located in New Delhi, Delhi
lustrous GIA Certified Diamond of 3,00 carats, in perfect shape, F color VS1 clarity, very sparkly, and
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

18k Gold

GIA Certified 1.00 Carat Diamond Rose Gold engagement Ring
Located in New York, NY
Handcrafted GIA Certified Diamond Ring featuring 1.00 Carat Round Brilliant Cut Diamond with H
Category

2010s American Art Deco Used Gia Certified Diamonds

Materials

Diamond, 18k Gold, Rose Gold

GIA Certified 10.00 Carats Round Brillant Shape Diamonds 18K Gold Earrings
Located in New Delhi, Delhi
in 18k gold with 2 pieces of lustrous GIA Certified Diamonds , in perfect round brillant shape, of
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 7.00 Carats G/VS1 Emerald Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
light and sophistication on yourself. Magnificent ring come in 18k gold with a lustrous GIA Certified
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Emerald, 18k Gold

GIA Certified 2.00 Ct D/VVS1 Pear Shape Diamond 18K Gold Solitaire Ring
Located in New Delhi, Delhi
come in 18k gold with a lustrous GIA Certified Diamond of 2,00 carats , in perfect pear shape, D color
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 3.00 Ct FLAWLESS / D color Heart Shape Diamond 18K Gold Pendant
Located in New Delhi, Delhi
perfect also as a investment. Stunning pendant come in 18k gold with a lustrous GIA Certified Diamond of
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 3.00 Ct FLAWLESS/ D color Heart Shape Diamond 18K Gold Pendant
Located in New Delhi, Delhi
perfect also as a investment. Stunning pendant come in 18k gold with a lustrous GIA Certified Diamond of
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 10 Carat Diamond Earrings in 18K White Gold
By Antinori Fine Jewels
Located in Chicago, IL
GIA Certified Diamond Earrings in 18K White Gold These breathtaking earrings showcase ten
Category

2010s Italian Modern Used Gia Certified Diamonds

Materials

Diamond, White Diamond, White Gold

GIA Certified 5.00 Carats E/VS2 Oval Shape Diamonds 18K Gold Solitaire Ring
Located in New Delhi, Delhi
. Magnificent ring come in 18k gold with a lustrous GIA Certified Diamond of 5,00 carats, E color VS2 clarity
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 5.00 Carats G/VVS Square Emerald Shape Diamond 18k Gold Ring
Located in New Delhi, Delhi
18k gold with a GIA Certified Diamond of 5,00 carats , in perfect shape , G color VVS clarity, very
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Emerald, 18k Gold

GIA Certified 3.00 Carats D/VS1 Pear Shape Diamond 18K Gold Pendant
Located in New Delhi, Delhi
necklace come in 18k gold with lustrous GIA Certified Diamond of 3,00 carats, D color (extra white color
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 4.33 Carats D/VVS2 Marquise Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
. Magnificent ring come in 18k gold with lustrous GIA Certified Diamond of 4,33 carats, in perfect marquise
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 11 Carat F VS2 Pear Cut Diamond Ring
Located in Chicago, IL
Exquisite 11-Carat GIA-Certified Diamond Ring Indulge in the brilliance of this extraordinary 11
Category

2010s American Contemporary Used Gia Certified Diamonds

Materials

Diamond, White Diamond, Platinum

1.85 Carat 5 Stone Diamond Rose Gold Anniversary Band Ring GIA Certified
By H H Jewels
Located in Miami, FL
the diamonds are certified by GIA. Slip on this exquisite piece for a classic-meets-modern style
Category

2010s American Used Gia Certified Diamonds

Materials

Diamond, Rose Gold, Gold, 18k Gold

GIA Certified 5.00 Carats E Color Radiant Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
come in 18k gold with a lustrous GIA Certified Diamond of 5,00 carats, in perfect radiant shape, E
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

NALLY GIA Diamond Drop Earrings
Located in New York, NY
brilliant cut diamonds, total weight 0.65 carats color: E-F, clarity: VS, with suspended with two GIA
Category

2010s American Artist Used Gia Certified Diamonds

Materials

Diamond, Platinum

AIG Certified 3.00 Ct Burma Ruby GIA Certified 1.00 Ct Diamonds 18K Gold Ring
Located in New Delhi, Delhi
heated, and 2 pieces of dazzling GIA Certified Diamonds of 0,50 +0,50 cts = 1,00 carats in total , in
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Ruby, 18k Gold

Peter Suchy GIA Certified 3.25 Carat Diamond Yellow Gold Stud Earrings
By Peter Suchy
Located in Stamford, CT
Original old mine cushion cut diamond stud earrings. GIA certified diamonds circa 1880. Set in new
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, Gold, 18k Gold, Yellow Gold

GIA Certified 2.00 Carats F/VS1 Round Brillant Shape Diamond 18K Gold RIng
Located in New Delhi, Delhi
. Magnificent ring come in 18k gold with lustrous GIA Certified Diamond of 2,00 carats, in perfect round
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 4.00 Carats F/VS1 Marquise Cut Diamond 18K Gold Ring Solitaire
Located in New Delhi, Delhi
gold with a lustrous GIA Certified Diamond of 4,00 carats , in perfect marquise shape , F color VS
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 0.62ct Diamond Solitaire Ring in 18K Gold (J/SI1)
Located in Miami, FL
A classic and elegant GIA-certified diamond solitaire ring, crafted in 18K yellow gold. The
Category

Early 2000s Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

Certified 2ct FSI Emerald Cut Diamond Engagement Ring with 22ct Yellow Gold
Located in Brisbane, AU
2ct FSI emerald cut exquisite diamond Ready to post Platinum with 22ct yellow gold detail GIA
Category

2010s Australian Artist Used Gia Certified Diamonds

Materials

Diamond, Emerald, 22k Gold, Rose Gold, White Gold, Yellow Gold, Platinum

GIA Emerald Natural Diamond 1.60ct F/VS1 Loose GIA XX $2000 Credit, Inscription
By GIA
Located in San Diego, CA
Exquisite loose 1.60ct emerald-cut diamond certified by GIA with laser inscription number
Category

2010s American Modern Used Gia Certified Diamonds

Materials

Green Sapphire, Emerald, Multi-gemstone, Rubelite, Ruby, Sapphire, Blue ...

GIA Certified 5.00 Carat Marquise Shape Diamond 18K Gold Ring
Located in New Delhi, Delhi
diamonds. Light is eternal, diamonds are forever. Magnificent ring come with a lustrous fancy GIA Certified
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 1.58 Carat Fancy Brownish Greenish Yellow SI2 Clarity Diamond
Located in บางรัก, TH
the brightness of yellow, creating a complex and rich coloration. Our GIA Certified Diamond is a
Category

2010s Asian Used Gia Certified Diamonds

Materials

Diamond

GIA Certified 2.05 Carat Emerald Cut Diamond Stud Earrings 14 Karat White Gold
Located in New York, NY
Handcrafted GIA Certified Diamond Stud Earrings featuring 2.05 Carat Total Weight Emerald Cut G-H
Category

2010s American Contemporary Used Gia Certified Diamonds

Materials

Diamond, 14k Gold, White Gold

GIA Certified 6.00 Ct D/VS2 Marquise Shape Diamonds 18K Gold Earrings
Located in New Delhi, Delhi
ok your look. Stunning earrings come in 18k gold with 2 pieces of lustrous GIA Certified Diamonds of
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 5.00 Carats Emerald Shape 18k Gold Ring
Located in New Delhi, Delhi
lustrous GIA Certified Diamond of 5,00, in perfect emerald shape, J color SI1 clarity, very sparkly , and
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Emerald, 18k Gold

GIA Certified 5.00 Ct F/VS1 Marquise Shape Diamond 18K Gold Solitaire Ring
Located in New Delhi, Delhi
GIA Certified Diamond of 5,00 carats, in perfect marquise shape, F color VS1 clarity , very sparkly
Category

21st Century and Contemporary Used Gia Certified Diamonds

Materials

Diamond, 18k Gold

GIA Certified 9.01 Carat Natural Oval Brilliant G Color Diamond Engagement Ring
Located in Los Angeles, CA
A Magnificent 9.01 carat Natural GIA Certified Diamond Engagement Ring. The center stone is laser
Category

2010s North American Modern Used Gia Certified Diamonds

Materials

Diamond, Platinum

GIA Certified 1.39 Carat Diamonds Engagement Ring 14k White Gold
Located in Miami, FL
GIA Certified 1.39 Carat Diamonds Engagement Ring 14k White Gold. Beautiful GIA Certified diamond
Category

1990s Used Gia Certified Diamonds

Materials

Diamond, 14k Gold, White Gold

GIA Certified 0.53 Carat Natural Fancy Cushion Diamond Engagement Halo Ring
By Jay Rawat
Located in Jaipur, IN
A chic and classic engagement ring with a beautiful cushion shape GIA certified diamond in the
Category

21st Century and Contemporary Indian Modern Used Gia Certified Diamonds

Materials

Diamond, 18k Gold, White Gold

GIA Certified Cushion Diamond Platinum Engagement Cocktail Ring
By Dover Jewelry
Located in Miami, FL
prong set cushion modified brilliant GIA certified diamond approx. 0.81 carat, H color, VS1 clarity
Category

2010s American Art Deco Used Gia Certified Diamonds

Materials

Diamond, Platinum

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

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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 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 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 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.