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3ct Oval Diamond

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1/3 Ct, Oval Diamond Ring, Half Bezel Diamond Band, 14K Solid Gold, SI GH
Located in New York, NY
Colorless Related Keywords: Oval Diamond, 14k Gold Ring, Rose Gold Ring, Prongs, Diamond Ring, Cocktail
Category

2010s American Contemporary Fashion Rings

Materials

Diamond, Gold

Vintage 1980's 3ct Oval Cut Amethyst Ring with Diamonds
Located in Boston, MA
Vintage 1980's 3ct Oval Cut Amethyst Ring with Diamonds - the amethyst weighs approximately 3ct and
Category

Vintage 1980s Unknown Contemporary Cocktail Rings

Materials

Amethyst, Diamond

0.31 ct Brown Diamond Cluster 3 Oval Ring
Located in New York, NY
oriented oval-like shapes, each filled with lustrous Brown Diamonds. The rich and earthy tones of the
Category

21st Century and Contemporary Cluster Rings

Materials

Brown Diamond, 14k Gold, Rose Gold

Vintage 3 Stone 3.36 Ct Oval Morganite & Diamond White Gold Ring
Located in New York, NY
3.36 Ct Morganite oval has an excellent peachy pink color and is complemented by a vivid diamond on
Category

21st Century and Contemporary Contemporary Bridal Rings

Materials

Diamond, Morganite, White Gold

3ct Aquamarine Pendant w Natural Diamonds in Solid 14K White Gold Oval 11x9mm
Located in Columbus, OH
This beautiful pendant features a stunning 3ct sea blue oval aquamarine with natural earth-mined
Category

2010s American Modern Pendant Necklaces

Materials

Aquamarine, Diamond, White Diamond, Gold, 14k Gold, White Gold

5.40 ct Natural Fancy Yellow Oval Diamond 3 Stone Engagement Ring GIA Scarselli
By SCARSELLI
Located in New York, NY
Three Stone Engagement Ring with GIA certified 5.40 carat Fancy Yellow Oval Cut Diamond center
Category

2010s American Contemporary Engagement Rings

Materials

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

GIA Certified 3 Ct Natural Oval Ruby & Diamond Pendant Necklace 14K Yellow Gold
Located in New York, NY
GIA Certified 3 Ct Natural Oval Ruby & Diamond Pendant Necklace 14 Karat Yellow Gold This
Category

Early 2000s Pendant Necklaces

Materials

Diamond, Ruby, Yellow Gold, 14k Gold

3ct Oval Deep Blue Sapphire Wedding Women Ring with Diamond in 18k Yellow Gold
By VR Jewels
Located in Houston, TX
3 ct Sapphire and Diamond Ring in 18K Gold featuring natural sapphire of 3 carats and diamonds of
Category

21st Century and Contemporary American Art Deco Wedding Rings

Materials

Diamond, Sapphire, Blue Sapphire, Gold, 18k Gold, Yellow Gold

3 Carat Oval Treated Ruby & 1.25 ct Diamond Ring 14 Karat White Gold Size 6
Located in New York, NY
Introducing a truly stunning piece, behold the 3 Carat Oval Treated Ruby & 1.25 ct Diamond Ring in
Category

2010s Cocktail Rings

Materials

Diamond, Ruby, 14k Gold, White Gold

Vintage Blue Zircon Diamond Cluster Ring 3ct Zircon
Located in Kendal, GB
hue. It weighs approx. 3ct and is framed by ten sparkling brilliant cut diamonds around the outside
Category

Vintage 1960s European Retro Cluster Rings

Materials

Diamond, Zircon, Blue Zircon, 18k Gold, White Gold, Yellow Gold

Certified 3ct Sapphire and Diamond 18ct Gold Ring
By David Jerome
Located in Bishop's Stortford, Hertfordshire
This ring designed by David Jerome is from his private collection and features one oval cut
Category

21st Century and Contemporary British Contemporary Cluster Rings

Materials

Sapphire, Diamond, 18k Gold, White Gold

3ct Natural Ruby Cross Diamond Pendant 18kt
Located in New York, NY
color Natural 3ct Rubies Brilliant oval, full cuts clean clarity & transparent Cross: 35 x 25mm
Category

2010s American Pendant Necklaces

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

3ct Natural Ruby Cross Diamond Pendant 18kt
3ct Natural Ruby Cross Diamond Pendant 18kt
Free Shipping
W 1.38 in L 0.99 in
Oval Pendant Locket - 18k Yellow Gold - Turquoise Enamel 3 Diamonds 0.04 ct G VS
By Victor Mayer
Located in Pforzheim, DE
Victor Mayer oval pendant locket 18k yellow gold, emerald turquoise vitreous enamel, 3 diamonds
Category

21st Century and Contemporary German Contemporary Pendant Necklaces

Materials

Diamond, 18k Gold, Yellow Gold, Enamel

Oval Floral Locket Pendant 18k Yellow Gold Red/Orange Enamel 3 Diamonds 0.04 ct
By Victor Mayer
Located in Pforzheim, DE
Collection, translucent red, orange vitreous enamel, 3 diamonds, total 0.04 ct, G VS, measurements app. 14.8
Category

21st Century and Contemporary German Arts and Crafts Pendant Necklaces

Materials

Diamond, 18k Gold, Yellow Gold, Enamel

3ct Blue Tanzanite & Diamond Ring In 950pt platinum
Located in Bloomington, MN
3ct Blue Tanzanite & Diamond Ring In 950pt platinum Introducing this beautiful Tanzanite ring
Category

Late 20th Century Modern Fashion Rings

Materials

Diamond, Tanzanite, Platinum

Oval Locket Pendant 18k White Gold Blue Vitreous Enamel 3 Diamonds 0.04 ct G VS
By Victor Mayer
Located in Pforzheim, DE
enamel, 3 Diamonds, total 0.04 ct, G VS, measurements app. 24.7 mm x 14.8 mm About the creator Victor
Category

21st Century and Contemporary German Arts and Crafts Pendant Necklaces

Materials

Diamond, White Gold, 18k Gold, Enamel

Art Deco Platinum Clip Brooch Amethyst 3 Ct Diamonds Unisex, 1920
Located in Herzelia, Tel Aviv
Art Deco Platinum Clip Brooch Amethyst 3 Ct Diamonds Unisex, 1920 This is a stunning Art Deco clip
Category

Vintage 1920s Art Deco Brooches

Materials

Amethyst, Diamond, Platinum

11 Ct Fine Multi Sapphire & 3 Ct Diamond Cocktail Flower Ring in 18 Kt Gold 6.5
Located in New York, NY
11 Ct Fine Multi Sapphire & 3 Ct Diamond Cocktail Flower Ring in 18 Kt Gold 6.5 18 Karat yellow
Category

2010s Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Rose Gold, 18k Gold

18K Gold Black Rhodium Sapphire Diamond 3ct Cluster Clip-On Earrings
By Unbranded
Located in New York, NY
Sapphire Center Stone Shape: Oval Center Stone Carat Weight: 0.75ct approx. each Number of Diamonds: 30
Category

Late 20th Century Unknown Retro Clip-on Earrings

Materials

Diamond, Blue Diamond, Sapphire, Pink Sapphire, Gold, 18k Gold, White Go...

Antique Opal and 3ct Old Cut Diamond 18ct Gold Cluster Cocktail Ring
Located in St Helens, GB
A superb Opal and Diamond cluster ring. Solid 18 carat gold example. Designed with an oval shaped
Category

20th Century Victorian Cluster Rings

Materials

Diamond, Opal, Gold

Ruby 3 Ct. Each Earrings White Gold with Circle of Diamonds with Certificate
By Crivelli
Located in Roma, IT
Ruby 3 ct. Each Earrings White Gold with Circle of Diamonds, with Certificate. Contemporary Design
Category

2010s Italian Contemporary Clip-on Earrings

Materials

Diamond, Ruby, 18k Gold, White Gold

Rare 3ct Carat Tsavorite Garnet Diamond Halo Ring 18ct White Gold Valuation
Located in Mona Vale, NSW
with a halo of white diamonds that are graded VS2-SI1 and colour G-H by the independent valuer. They
Category

2010s Tanzanian Modern Engagement Rings

Materials

Diamond, Garnet, Tsavorite, White Gold

3ct Fine Australian White Opal Oval Cabochon 18k Yellow Gold Pendant Necklace
By Gems and Jewels UK
Located in Birmingham, GB
opal with beautiful play of colour and an excellent oval cabochon cut. Set in a fine 18k yellow gold 4
Category

21st Century and Contemporary Pendant Necklaces

Materials

Opal, Gold, 18k Gold, Yellow Gold

GIA Certified 3.20 Ct. Unheated Blue Sapphire and Diamond Platinum 3-Stone Ring
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This gorgeous blue sapphire and diamond three-stone ring features a brilliant 3.20 carat oval
Category

21st Century and Contemporary North American Artisan Three-Stone Rings

Materials

Diamond, Blue Sapphire, Sapphire, Platinum

3ct Emerald Bezel Set with Diamond Slice Halo 14K Yellow Gold Engagement Ring
Located in Osprey, FL
resizing) ♥ Band width: 2.4mm ♥ Material: 14K yellow gold ♥ Gemstone: Center emerald is 3ct, Diamonds
Category

2010s American Engagement Rings

Materials

Emerald, Diamond, 14k Gold, Yellow Gold

English 9K White Gold Natural 1.3ct Emerald & 0.36ct 1/3ct Diamond Accent Engage
Located in Chesham, GB
15mm, Length 10mm Genuine Natural Emerald & Diamonds - One large central Oval cut 8x6mm (0.32"x0.24
Category

2010s British Victorian Bridal Rings

Materials

Diamond, Emerald, 9k Gold, White Gold

3 Carat Tanzanite and 1 Ct Diamond Pendant or Necklace 14 Karat Yellow Gold
Located in New York, NY
3 Carat Tanzanite and 1 Ct Diamond Pendant or Necklace 14 Karat Yellow Gold Tanzanite Weight
Category

2010s Drop Necklaces

Materials

Diamond, Tanzanite, 14k Gold, Yellow Gold

Art Deco French Sapphire Diamond Ring 3ct of Sapphire Circa 1920
Located in Kendal, GB
an array of marquise cut diamonds, French cut sapphires and a larger oval cut sapphire bezel set in
Category

Vintage 1920s French Art Deco Cocktail Rings

Materials

Diamond, Sapphire, Platinum

1-1/3 ct. Sterling Silver Blue Sapphire and Single-Cut Diamond Stud Earrings
By Affinity Designs LLC
Located in New York, NY
Indulge in the elegance of our Blue Sapphire and White Diamond Stud Earrings in Sterling Silver
Category

2010s Asian Retro Hoop Earrings

Materials

Diamond, Blue Sapphire, Sterling Silver

1-3/4 ct. Aquamarine and Diamond Accent 14K Rose Gold Pendant Necklace
By Affinity Designs LLC
Located in New York, NY
Indulge in the elegance of our Aquamarine and White Diamond Drop Pendant Necklace in 14K Rose Gold
Category

2010s Asian Contemporary Pendant Necklaces

Materials

Aquamarine, Rose Gold

Antique Vintage Italian Ring 3ct Sapphire 2ctw Diamonds 18K Gold Ø 10.25 US/ 8gr
Located in SE
dark Blue/with slight tint of Green Sapphire 10mm x 8mm / ca. 3ct and 14 pave set rose cut Diamonds Ø
Category

Vintage 1930s Italian Art Deco Cluster Rings

Materials

Diamond, Sapphire, 18k Gold

Modernist Stylized Rose Pendant Necklace with 3ct White Diamonds & 18kt Gold
Located in New York, NY
yellow gold and diamonds. The pendant is flooded with 3 carats of modern cut white diamonds of beautiful
Category

20th Century Italian Modern Pendant Necklaces

Materials

White Diamond, Gold

14k Gold 2.13ct Genuine Natural Alexandrite Earrings with 1/3ct Diamonds #J1721
Located in Big Bend, WI
Exceptional 14k Gold 2.13ct Genuine Natural Alexandrite Earrings with 1/3ct Diamonds #J1721 14K
Category

20th Century Contemporary Dangle Earrings

Materials

Alexandrite, Diamond, 14k Gold

3-1/4 ct. Blue Topaz & Diamond Accent 18K Yellow Gold over Sterling Silver Ring
By Affinity Designs LLC
Located in New York, NY
Indulge in the elegance of our Oval Swiss Blue Topaz with Round White Diamond Accented 18K Yellow
Category

2010s Asian Contemporary Fashion Rings

Materials

Diamond, Blue Topaz, Sterling Silver, Gold Plate

Lotus East West Ring with 3ct Emerald Solitaire, Blue Sapphire and Diamonds
By Ri Noor
Located in Houston, TX
approximately 3ct, pave set blue sapphire petals in a lotus motif, and pave set brilliant cut white diamonds
Category

2010s Engagement Rings

Materials

Diamond, Emerald, Sapphire, Blue Sapphire, 14k Gold, White Gold

3/4 ct. 14K Rose Gold Pear Aquamarine with Diamond Accent Drop Pendant Necklace
By Affinity Designs LLC
Located in New York, NY
Indulge in the elegance of our 14K Rose Gold Pear Aquamarine with Diamond Accented Drop Pendant
Category

2010s Asian Contemporary Pendant Necklaces

Materials

Aquamarine, Rose Gold

Platinum Tima Delicate Scattered Organic Design Diamond Ring '3/4 Ct. tw'
Located in San Francisco, CA
love of Oval, Pear, and Round shape diamonds creates the ultimate organic ring. It's stackable-Its fun
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, Platinum

14k yellow Gold Contemporary Oval Sapphire & Oval Diamond Ring
Located in Lexington, KY
showcases a 3 stone ring design with diamonds on the shoulders and a sapphire center stone. Though the
Category

Vintage 1950s American Contemporary Three-Stone Rings

Materials

Diamond, Sapphire, 14k Gold, Yellow Gold

Oval Sapphire and Diamond Ring
Located in Derby, NY
Elegant sapphire and diamond ring with a vivid "East-West" oval sapphire, 0.94 ct./0.95 ct
Category

21st Century and Contemporary Unknown Modern Fashion Rings

Materials

Sapphire, Diamond, 18k Gold, White Gold

Amazing 3ct Spread Rose Cut Diamond Salt and Pepper 14ct Gold Solitaire Ring
Located in St Helens, GB
, oval shaped rose cut diamond solitaire ring in full grain bezel setting. The salt and pepper diamond
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Gold

Amazing 3ct Spread Rose Cut Diamond Salt and Pepper 14ct Gold Solitaire Ring
Located in St Helens, GB
, oval shaped rose cut diamond solitaire ring in full grain bezel setting. The salt and pepper diamond
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Gold

Pendant Locket Necklace 18k Yellow Gold Turquoise Enamel 3 Diamonds 0.04 ct G VS
By Victor Mayer
Located in Pforzheim, DE
Material: 18k Yellow Gold Vitreous enamel: emerald turquoise Diamonds: 3 diamonds, total 0,04 ct, G VS
Category

21st Century and Contemporary German Contemporary Pendant Necklaces

Materials

Diamond, 18k Gold, Yellow Gold, Enamel

3ct Rubelite Tourmaline Set in "Forget Me Knot" Ring 18ct Gold
Located in Brisbane, AU
3ct oval cut Rubellite Tourmaline set in Forget Me Knot design Custom made to order* Please
Category

2010s Australian Artist Cocktail Rings

Materials

Rubelite, Tourmaline, Gold, 18k Gold

18k Yellow Gold Tima Delicate Scattered Organic Design Diamond Ring '3/4 Ct. Tw'
Located in San Francisco, CA
love of Oval, Pear, and Round shape diamonds creates the ultimate organic ring. It's stackable-Its fun
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, Yellow Gold

18K White Gold Tima Delicate Scattered Organic Design Diamond Ring '3/4 Ct. tw'
Located in San Francisco, CA
love of Oval, Pear, and Round shape diamonds creates the ultimate organic ring. It's stackable-Its fun
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, White Gold

14K Rose Gold Tima Delicate Scattered Organic Design Diamond Ring '3/4 Ct. Tw'
Located in San Francisco, CA
love of Oval, Pear, and Round shape diamonds creates the ultimate organic ring. It's stackable-Its fun
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, Rose Gold

18K Rose Gold Tima Delicate Scattered Organic Design Diamond Ring '3/4 Ct. tw'
Located in San Francisco, CA
love of Oval, Pear, and Round shape diamonds creates the ultimate organic ring. It's stackable-Its fun
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, Rose Gold

14k Yellow Gold Tima Delicate Scattered Organic Design Diamond Ring '3/4 Ct. Tw'
Located in San Francisco, CA
love of Oval, Pear, and Round shape diamonds creates the ultimate organic ring. It's stackable-Its fun
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, Yellow Gold

14K White Gold Tima Delicate Scattered Organic Design Diamond Ring '3/4 Ct. tw'
Located in San Francisco, CA
love of Oval, Pear, and Round shape diamonds creates the ultimate organic ring. It's stackable-Its fun
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, White Gold

Black Rhodium Over 18K White Gold 1 3/8 Ct Diamond & White Quartz Dangle Earring
Located in New York, NY
stuns in 346 total diamonds set carefully within pave settings and totaling 1 3/8 cttw with an
Category

21st Century and Contemporary Thai Contemporary Dangle Earrings

Materials

Quartz, Diamond, White Diamond, 18k Gold, Rhodium, White Gold

3 Carat Fancy Yellow Oval Diamond Halo Ring
Located in New York, NY
Juicy 3ct Fancy Yellow Oval full of color, no bow tie and amazing shine Set in a Platinum and 18kt
Category

2010s Fashion Rings

Materials

Yellow Diamond, Yellow Gold, Platinum

Antique German Ring 3ct Aquamarine solid 18K Gold Ø 6.75 US /4.4gr
Located in SE
Aquamarine stone 10 mm x 8 mm x 4.6 mm / ca. 3 ct ct, color light Blue with tint of Green. The Crown is 16
Category

Vintage 1930s German Art Deco Solitaire Rings

Materials

Aquamarine, 18k Gold

Mesmerizing 1ct Oval Diamond Ring in 18K White Gold
Located in רמת גן, IL
cut: Oval Brilliant color: F clarity: VS2 cut grade: EX 2 diamond side stones of total: 0.27 ct. cut
Category

2010s Israeli Engagement Rings

Materials

Diamond, 18k Gold, White Gold

Antique Diamond Brooch Interlinked Ovals
Located in Zurich, Zollstrasse
14 K yellow Gold brooch showcasing 3 interlinked ovals set with 44 old european cut Diamonds
Category

Antique 1880s Unknown Late Victorian Brooches

Materials

Diamond, 14k Gold, Yellow Gold

Antique Diamond Brooch Interlinked Ovals
Antique Diamond Brooch Interlinked Ovals
Free Shipping
W 0.75 in L 1.97 in
English Victorian Style 14K Yellow Gold Total 3ct Blue Topaz Trilogy Ring
Located in Chesham, GB
) oval cut Blue Topaz in a gorgeous 14ct Yellow Gold setting with a carving on its shoulders. Made from
Category

2010s British Victorian Three-Stone Rings

Materials

Topaz, Blue Topaz, 14k Gold, Yellow Gold

Oval ruby ring.
By Daizy Jewellery
Located in Istanbul, TR
. Gemstones: Ruby: oval cut, 1 ct, red color, transparent. Other stones: Diamonds: round brilliant cut, G/Vs
Category

2010s Turkish Modern Cocktail Rings

Materials

Diamond, Ruby, 14k Gold

Oval emerald ring.
By Daizy Jewellery
Located in Istanbul, TR
Jewellery. Metal: 14k gold Weight: 3 gr depends from size. Gemstones: Emerald: oval cut, 0.8 ct, green
Category

2010s Turkish Modern Engagement Rings

Materials

Diamond, Emerald, 14k Gold

14k Gold Floral Ring with Oval Apatite, Diamonds and Pearls
By Daizy Jewellery
Located in Istanbul, TR
with inclusions (See in photo) Diamonds: G/VS1, brilliant cut, weight - 0.06 ct (3 pieces x 0.02 ct
Category

2010s Turkish Modern Fashion Rings

Materials

Diamond, Pearl, Apatite, 14k Gold

Oval Red Processed Gemstone Ring Diamond Solid 10K Yellow Gold Diamond Jewelry
By Spectrum Jewels
Located in IN
Item Code :- STR-2074 Gross Wt :- 4.93 gm 10k Yellow Gold Wt :- 3.07 gm Diamond Wt :- 0.55 ct
Category

21st Century and Contemporary Indian Modern Cocktail Rings

Materials

Diamond, 10k Gold, Yellow Gold

Le Vian 7 Carat Oval Morganite Chocolate Diamond Rose Gold Ring
By Le Vian
Located in Great Neck, NY
Chocolatier® sweetened with accents of 1/3 cts. Chocolate Diamonds (1/3 ct. t.w.) and White Diamonds (3/8 ct
Category

2010s Fashion Rings

Materials

White Diamond, Brown Diamond, Morganite, 14k Gold, Rose Gold

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3ct Oval Diamond For Sale on 1stDibs

You are likely to find exactly the 3ct oval diamond you’re looking for on 1stDibs, as there is a broad range for sale. Every item for sale was constructed with extraordinary care, often using Gold, White Gold and 18k Gold. Find an antique version now, or shop for 65 vintage or 191 modern creation for a more contemporary example of these cherished accessories. If you’re looking for a 3ct oval diamond from a specific time period, our collection is diverse and broad-ranging, and you’ll find at least one that dates back to the 18th Century while another version may have been produced as recently as the 21st Century. For this particular accessory, there are many different carat weights to choose from, but .5 Carat and 1 Carat versions are of considerable interest. There have been many well-made iterations of the classic 3ct oval diamond over the years, but those made by House of R&D, Alexander Beverly Hills and Cellini are often thought to be among the most beautiful. Today, if you’re looking for an oval cut version of this piece and are unable to find the perfect match, our selection also includes round cut and brilliant cut alternatives. There aren’t many items for men if you’re seeking a 3ct oval diamond, as most of the options available are for women and unisex.

How Much is a 3ct Oval Diamond?

On average, a 3ct oval diamond at 1stDibs sells for $7,698, while they’re typically $1 on the low end and $442,800 for the highest priced versions of this item.
Questions About 3ct Oval Diamond
  • 1stDibs ExpertOctober 12, 2021
    One of the best settings for oval diamonds is the prong. The most frequent and classic setting type, it exposes the majority of the diamond and lets more light penetrate, increasing its brightness and shine.
  • 1stDibs ExpertJune 30, 2023
    What three diamonds mean on a wedding ring is largely a matter of personal interpretation. However, many people associate the stones with a couple’s past, present and future. To others, the trio of stones may symbolize the Holy Trinity. On 1stDibs, shop a selection of diamond wedding rings.
  • 1stDibs ExpertSeptember 28, 2021
    A 3-carat diamond’s worth varies depending on the 4Cs of diamond quality – color, cut, clarity and carat. On average, a 3-carat diamond could cost you between $7,200 to $51,000. It is also likely that the price range per carat will be even broader. On 1stDibs, you can find a variety of 3-carat diamond jewelry today.
  • 1stDibs ExpertFebruary 27, 2024
    In terms of dimensions, how large a 3-carat diamond is varies. The shape of the diamond will determine its length and width. Weighing 600 milligrams, diamonds that are 3 carats are generally considered to be large stones. On 1stDibs, shop a large collection of diamond jewelry from some of the world's top dealers.
  • 1stDibs ExpertAugust 24, 2021
    A 2 carat oval diamond is approximately 10.23mm × 6.82mm × 4.16mm in size. These diamonds usually have an approximate face-up area of 57.21 mm². Find a variety of diamonds on 1stDibs.
  • 1stDibs ExpertFebruary 13, 2023
    Whether a 3-carat diamond is considered big is largely a matter of personal opinion. The average diamond is 1 to 2 carats in size. On 1stDibs, shop a selection of diamond jewelry.
  • 1stDibs ExpertFebruary 22, 2021
    The three diamonds on an engagement ring mean friendship, love, and fidelity or past, present, and future.This type of ring is also called a Trinity or trilogy ring.