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25 Carat Diamond Ring Princess Cut

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.94 Carat Princess Cut Diamond Engagement Ring, 14 Karat White Gold Square Halo
Located in Greensboro, NC
Diamonds Clarity: I2 (solitaire); SI2 - I1 (accents) Color: G Cuts: Princess (solitaire) & Round
Category

21st Century and Contemporary Unknown Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1ct Princess cut Diamond& Diamond Ring In White Gold
Located in Bloomington, MN
1ct Princess cut Diamond& Diamond Ring In White Gold Discover the allure of this exquisite ring
Category

21st Century and Contemporary Contemporary Fashion Rings

Materials

Diamond, 14k Gold, White Gold

White Gold Diamond Solitaire Ring, 14 Karat Princess Cut 1.02 Carat EGL, USA
Located in Greensboro, NC
Diamond Clarity: I1 Color: H - I Cut: Princess Carat: 1.02ct Solitaire’s EGL USA Report Number: US
Category

20th Century Unknown Solitaire Rings

Materials

Diamond, 14k Gold, White Gold

10K Rose Gold 1/3 Carat Princess Cut Diamond Composite Square Shape Ring
Located in New York, NY
: Diamond Type: Natural White Diamonds Diamond Count: 25 Princess-Cut Diamond Diamond Color: H-I Diamond
Category

21st Century and Contemporary Indian Contemporary Fashion Rings

Materials

Diamond, White Diamond, 10k Gold, Rose Gold

14 Karat White Gold Princess Cut Diamond Eternity Ring with 3.50 Carat
By Gregory Mikaelian & Sons, Inc.
Located in Los Angeles, CA
14k white gold ladies princess cut diamond eternity, containing 25 princess cut diamonds; color "G
Category

2010s American Art Deco Wedding Rings

Materials

Diamond, 14k Gold

Artdeco Princess White Golden Ring 14 Carat with Rose Cut Diamonds
Located in Heemstede, NL
Artdeco princess ring with rose cut diamonds. Absolutely stunning ring with rose cut diamonds in
Category

Vintage 1920s European Art Deco Band Rings

Materials

Diamond, 14k Gold, Gold

Silver Black Diamond Ring, 925 Princess Cut 1.00ct Men's Solitaire
Located in Greensboro, NC
Stone Information: Natural Diamond Treatment: Color Enhanced Color: Black Cut: Princess Carat
Category

21st Century and Contemporary Solitaire Rings

Materials

Black Diamond, Sterling Silver, Silver

Silver Black Diamond Ring, 925 Princess Cut 1.00ct Men's Solitaire
Located in Greensboro, NC
This ring is a size 11 - 11 1/4, but it can be re-sized up or down 1 size for a $25 fee. Once a
Category

Late 20th Century Unknown Cocktail Rings

Materials

Black Diamond, Silver

Sterling Silver Black Diamond Ring, 925 Princess Cut 1.20ctw Men's
Located in Greensboro, NC
; Black Cuts: Princess (solitaire) & Round Brilliant (accents) Solitaire's Carat: 1.00ct Accents
Category

Late 20th Century Unknown Cocktail Rings

Materials

Black Diamond, Sterling Silver

0.80 Cttw. Princess Cut Diamond Halo Engagement Ring 14K White Gold
Located in beverly hills, CA
Estate 14k white gold diamond engagement ring features a princess cut diamond weighing
Category

2010s Engagement Rings

Materials

Diamond, 14k Gold, White Gold

Princess Cut Diamond Engagement Ring .87ct EGL Wedding Ring Set 14K Brand New
Located in Dearborn, MI
Brand New EGL Princess Cut 3 Stone Diamond Engagement Ring .87ct Wedding Ring Set 14K White Gold
Category

2010s Engagement Rings

Materials

Diamond, 14k Gold, White Gold

Diamond Halo Engagement Ring, 18 Karat White Gold Princess .88 Carat
Located in Greensboro, NC
! Crafted in 18k white, yellow, and rose gold, this NEW piece showcases a sparkling princess cut diamond
Category

21st Century and Contemporary Unknown Engagement Rings

Materials

Diamond, Rose Gold, White Gold, Yellow Gold

2.30 Carat Princess Cut Natural Sapphire and Diamond Half Eternity Band Ring
Located in Tokyo, JP
A beautiful half eternity band ring featuring 2.30 Carats Natural Princess Cut Sapphires and 0.65
Category

21st Century and Contemporary Japanese Modern Cluster Rings

Materials

Diamond, Sapphire, Blue Sapphire, 18k Gold, White Gold

Sterling Silver Black Diamond Ring, 925 Princess Cut 1.00ct Men's Solitaire
Located in Greensboro, NC
Stone Information: Natural Diamond Treatment: Color Enhanced Color: Black Cut: Princess Carat
Category

Late 20th Century Unknown Solitaire Rings

Materials

Black Diamond, Sterling Silver

Silver Black Diamond Ring, 925 Princess Cut 1.00ct Men's Solitaire
Located in Greensboro, NC
This ring is a size 11 - 11 1/4, but it can be re-sized up or down 1 size for a $25 fee. Once a
Category

21st Century and Contemporary More Rings

Materials

Black Diamond, Silver

Sterling Silver Black Diamond Ring, 925 Princess Cut 1.20ctw Men's
Located in Greensboro, NC
- H; Black Cuts: Princess (solitaire) & Round Brilliant (accents) Solitaire's Carat: 1.00ct
Category

21st Century and Contemporary More Rings

Materials

Black Diamond, Sterling Silver

Sterling Silver Black Diamond Ring, 925 Princess Cut 1.00ct Men's
Located in Greensboro, NC
This ring is a size 9 - 9 1/4, but it can be re-sized up or down 1 size for a $25 fee. Once a ring
Category

21st Century and Contemporary More Rings

Materials

Black Diamond, Sterling Silver

White Gold Diamond Three-Stone Engagement Ring, 14k Princess Cut 1.00ctw
Located in Greensboro, NC
White Gold Stone Information Natural Diamonds Total Carats: 1.00ctw Cut: Princess Color: G - H
Category

21st Century and Contemporary More Rings

Materials

Diamond, White Gold

Sterling Silver Black Diamond Ring, 925 Princess Cut 1.00ct Men's Solitaire
Located in Greensboro, NC
Stone Information: Natural Diamond Treatment: Color Enhanced Color: Black Cut: Princess Carat
Category

21st Century and Contemporary More Rings

Materials

Black Diamond, Sterling Silver

White Gold Black & White Diamond Halo Engagement Ring, 14k Princess Cut 1.14ctw
Located in Greensboro, NC
: Natural Diamond Solitaire Carat: .44ct (weighed) Cut: Princess Color: F Clarity: SI2 Size: 4.3mm X
Category

21st Century and Contemporary More Rings

Materials

White Diamond, White Gold

White Gold Diamond Halo Engagement Ring & Wedding Band, 14k Princess 1.72ctw
Located in Greensboro, NC
diamonds. These rings are a size 9, but they can be re-sized up 2 sizes for a $30 fee each or down 1
Category

Late 20th Century Wedding Rings

Materials

Diamond, White Gold

14K White Gold 2 1/5 Carat Princess and Baguette Diamond Bypass Kite-Set Ring
Located in New York, NY
: Diamond Type: Natural White Diamond Diamond Count: Total 25 Diamond includes 9 Princess and 16 Baguette
Category

21st Century and Contemporary Indian Modern Fashion Rings

Materials

Diamond, White Diamond, 14k Gold, White Gold

Vintage 4.10 Carat Diamond and 18k White Gold Eternity Ring
Located in Jesmond, Newcastle Upon Tyne
grades) F/G Clarity (average grades) VS1/VS2 Cut Princess Content 4.10 carats Number of Diamonds 25
Category

20th Century Band Rings

Materials

Diamond, 18k Gold, White Gold

IGI Certified Diamond Engagement Ring, in 18K White Gold, Hand Cut Lucere
Located in London, GB
cut diamonds. UK ring size "L" / US "6" / German "52 (16.6)" / Spain "12" / France "52" / Italy "11
Category

2010s British Modern Cluster Rings

Materials

White Diamond, Diamond, 18k Gold, White Gold

Semi-Mount Engagement Ring 14 Karat White Gold for Center Diamonds .38 Carat
Located in Greensboro, NC
Information: Natural Diamond Accents Clarity: SI1 - SI2 Color: G Cut: Princess Total Carats: 0.38ctw
Category

21st Century and Contemporary Unknown Engagement Rings

Materials

Diamond, 14k Gold, White Gold

14K Yellow Gold Diamond Cocktail Ring, 1.50tdw, 4.8g
Located in Laguna Beach, CA
three .25 carat princess cut diamonds. One has a chip on the surface. The other diamonds are round
Category

20th Century Cocktail Rings

Materials

Diamond, Yellow Gold

Diamond Ring 14K White Gold Vintage Estate 2.20 TDW Marquise
By Estate Jewelry
Located in East Brunswick, NJ
are .25 carat each, two more - .18 carat each, and two princess cut diamonds total .10 carat. The
Category

20th Century Cluster Rings

Materials

Diamond, 14k Gold, White Gold

New Semi-Mount Engagement Ring 14k White Gold for Center Diamonds .38ctw
Located in Greensboro, NC
Information: Natural Diamond Accents Clarity: SI1 - SI2 Color: G Cut: Princess Total Carats: 0.38ctw
Category

Late 20th Century Unknown Engagement Rings

Materials

Diamond, White Gold

5.58 ct IGI Yellow Round and Trapezoid Diamond High Jewellery Ring "Astoria 558"
Located in KAATSHEUVEL, NL
diamond 3 stones engagement ring. Round brilliant cut engagement ring with Light Yellow VVS2 center stone
Category

21st Century and Contemporary Italian Contemporary Three-Stone Rings

Materials

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

14K White Gold 2.0 Carat Diamond Double Loop Pendant Necklace
Located in New York, NY
White Diamonds Diamond Count: Total 25 Diamonds Includes 13 Baguette and 12 Princess-Cut Diamonds
Category

21st Century and Contemporary Indian Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, 14k Gold, White Gold

14K White Gold 2.0 Carat Diamond Double Loop Pendant Necklace
14K White Gold 2.0 Carat Diamond Double Loop Pendant Necklace
Free Shipping
H 0.79 in W 0.6 in L 0.79 in
10K White Gold 1/3 Cttw Diamond Double Triangle Pendant Necklace
Located in New York, NY
: Total 44 Diamond includes 19 Round and 25 Princess-Cut Diamonds Diamond Color: H-I Diamond Clarity: SI1
Category

21st Century and Contemporary Indian Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, White Gold, 10k Gold

3.44 Carat Natural Yellow Diamond Princess Cluster Diamond Ring
Located in New York, NY
HJN Inc. Ring featuring a 3.44 Carat Natural Yellow Diamond Princess Cluster with Round Diamonds
Category

21st Century and Contemporary Chinese Modern Fashion Rings

Materials

Diamond, White Diamond, Yellow Diamond, Platinum

Marcel Salloum V Shaped Sky Blue Princess Cut Diamond Ring
By Marcel Salloum
Located in London, London
V Shaped Sky Blue Princess Cut Diamond and Platinum Ring. It's suitable worn as an every day ring
Category

2010s British Contemporary Wedding Rings

Materials

Blue Diamond, Platinum

2.55 Carat Oval Cut Diamond All the Way around Bridal Ring in Platinum
By Kian Design
Located in South Perth, AU
ring. Princess cut diamonds: F colour, SI clarity, 4 x 2.5 mm, 25 = 2.55 carat total weight Weight
Category

2010s Australian Art Deco Bridal Rings

Materials

Diamond, White Diamond, Platinum

1.39 Carat Natural Yellow Princess Cluster Diamond Pendant
Located in New York, NY
HJN Inc. Ring featuring a 1.39 Carat Natural Yellow Princess Cluster Diamond Pendant Natural
Category

21st Century and Contemporary Chinese Modern Pendant Necklaces

Materials

Diamond, White Diamond, Yellow Diamond, Platinum

Diamond Solitaire Engagement Ring, Platinum Princess Cut .49 Carat
Located in Greensboro, NC
ring showcases a sparkling princess cut diamond solitaire held in a timelessly elegant cathedral-style
Category

20th Century Unknown Engagement Rings

Materials

Diamond, Platinum

LEO Diamond Ring White Gold and Platinum, 14 Karat LEO Princess .53 Carat
By The Leo Diamond
Located in Greensboro, NC
& Platinum (head) Stone Information: Natural Diamond Carat: .53ct Cut: LEO Princess Color: G Clarity: Si2
Category

20th Century Unknown Solitaire Rings

Materials

Diamond, 14k Gold, White Gold, Platinum

1.72 Carat Princess Cut Diamond Ring and Wedding Band 14 Karat Gold Halo
Located in Greensboro, NC
diamonds. These rings are a size 9, but they can be re-sized up 2 sizes for a $30 fee each or down 1
Category

20th Century Unknown Engagement Rings

Materials

Diamond, 14k Gold, White Gold

0.55 Carat Natural Princess Cut Sapphire and Diamond Half Eternity Band Ring
Located in Tokyo, JP
A beautiful half eternity band ring featuring 0.55 Carats Natural Princess Cut Sapphires and 0.41
Category

21st Century and Contemporary Japanese Modern Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

0.80 Carat Princess Cut Natural Sapphire and Diamond Half Eternity Band Ring
Located in Tokyo, JP
A beautiful half eternity band ring featuring 0.80 Carats Natural Princess Cut Sapphires and 0.35
Category

21st Century and Contemporary Japanese Modern Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

1.72 Carat Princess Cut Diamond Ring and Wedding Band 14 Karat Gold Halo
Located in Greensboro, NC
diamonds. These rings are a size 9, but they can be re-sized up 2 sizes for a $30 fee each or down 1
Category

21st Century and Contemporary Unknown Engagement Rings

Materials

Diamond, 14k Gold

Yellow Gold Diamond Engagement Ring, 14k Princess Cut .48ctw
By Leo Schachter
Located in Greensboro, NC
engagement ring! Fashioned in 14k yellow and white gold, this piece showcases a princess cut diamond
Category

20th Century More Rings

Materials

Diamond, Yellow Gold

LEO Princess Diamond Ring, 14 Karat Gold and Platinum VVSI I .75 Carat
By Leo Schachter
Located in Greensboro, NC
- Clarity: VVS1 Color: I Cut: Princess Carat: 0.75ct Peek-a-Boo Accent in Shank: Natural Diamond - Clarity
Category

20th Century Unknown Solitaire Rings

Materials

Diamond, 14k Gold, Yellow Gold, Platinum

GIA Certified 1.07 Carat Diamond Engagement Ring
Located in Miami, FL
Elegant engagement ring crafted in platinum, featuring a GIA certified 1.07 carat princess cut
Category

2010s American Contemporary Engagement Rings

Materials

Diamond, Platinum

Diamond Ring, 18 Karat White Gold Three-Stone with Accents Round Cut 1.00 Carat
Located in Greensboro, NC
Surprise your princess with this gorgeous engagement ring! Fashioned in high purity 18k white gold
Category

20th Century Unknown Engagement Rings

Materials

Diamond, 18k Gold, White Gold

White Gold Diamond Three-Stone Ring, 18 Karat Round Brilliant Cut 1.00 Carat
Located in Greensboro, NC
Surprise your princess with this gorgeous engagement ring! Fashioned in high purity 18k white gold
Category

20th Century Unknown Three-Stone Rings

Materials

Diamond, 18k Gold, White Gold

Diana-Style, 1.24 Carat, Natural Round-Cut Ruby and Diamond Ring Set in Platinum
Located in Tokyo, JP
A beautiful Princess Diana Style Halo Ring featuring a 1.24 Carat, Natural, Round-Cut Ruby and 0.50
Category

21st Century and Contemporary Japanese Modern Cluster Rings

Materials

Diamond, Ruby, Platinum

Composite Golden Yellow Sapphire and Diamond Halo Ring, 14 Karat Gold 1.45 Carat
Located in Greensboro, NC
Color: Yellow Cut: Princess Cut Brilliant Carats: 0.75ctw Natural Diamonds - Clarity: SI1 - SI2 Color
Category

20th Century Unknown Cocktail Rings

Materials

Diamond, Yellow Sapphire, 14k Gold, White Gold, Yellow Gold

LB Exclusive 18k White Gold 1.20 Ct Diamond Ring
By LB Exclusive
Located in Southampton, PA
setting of a mixture of round and princess cut diamonds. The ring has a band thickness of 3 mm, a top
Category

21st Century and Contemporary Band Rings

Materials

Diamond, White Gold

Yellow Gold Semi-Mount Engagement Ring, 14k for Center Diamonds .32ctw
Located in Greensboro, NC
& 14k White Gold Stone Information: Natural Diamond Accents Total Carats: .32ctw Cut: Princess
Category

20th Century More Rings

Materials

Diamond, Yellow Gold

White Gold Diamond Cluster Halo Ring, 14k Princess Cut .25ctw Engagement
Located in Greensboro, NC
Information: Natural Diamonds Clarity: I1 - I2 Color: H - I Cuts: Princess & Round Brilliant Total
Category

Antique 19th Century Unknown More Jewelry

Materials

White Gold

18 Karat White Gold Diamond Small Square Baguette Dangling Earring Ring Set
Located in Los Angeles, CA
ct 8 Princess Cut Stone = 0.15 ct Length: 0.50 inches / Width: 0.42 inches Ring: 8 Round Diamonds
Category

2010s American Stud Earrings

Materials

Diamond, White Diamond, 18k Gold, White Gold

White Gold Diamond Solitaire Engagement Ring, 18k Princess Cut .14ct Promise
Located in Greensboro, NC
Stone Information: Natural Diamond Carat(s): .14ct Cut: Princess Color: F Clarity: SI1 Size
Category

Late 20th Century More Rings

Materials

Diamond, White Gold

New Diamond & Sapphire Ring, 14k Yellow Gold Engagement Round Cut .71ctw
Located in Greensboro, NC
This magnificent NEW ring will delight your princess for a lifetime! Composed of glowing 14k yellow
Category

Late 20th Century Unknown Engagement Rings

Materials

Diamond, Sapphire, Yellow Gold

Fine Diamond Platinum Eternity Band Ring
Located in Aspen, CO
A fine diamond eternity band with approximately 3.75 cts. of fine white well matched princess cut
Category

21st Century and Contemporary American Contemporary Wedding Rings

Materials

Diamond, Platinum

1.00 Carat Diamond White Gold Engagement Ring
Located in Stamford, CT
Invisible set princess cut engagement ring. The princess cut diamonds are set in three groups of
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Gold, 14k Gold, White Gold

Tiffany & Co. GIA Platinum Blue Sapphire Diamond Ring 18.26 TCW Unheated Ceylon
Located in Sylvania, GA
18.26 Carat Antique Ring of Very Rich Platinum,18K & HUGE Diamonds & GIA Certified Sapphire that
Category

Antique 19th Century Cocktail Rings

Materials

Diamond, Blue Sapphire, Platinum

Alexandra Mor Two-Stone Princess-Cut and Oval-Cut Diamond Ring
By Alexandra Mor
Located in New York, NY
Design. An Alexandra Mor two-stone Diamond ring featuring a .51 ct. F VVS1 GIA Princess-cut Diamond and
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Platinum

Baguette Ruby Princess Diamond Gold Custom Band Ring
Located in Columbia, MO
diamond weighing .25 carat (G/VS) & 2 baguette cut rubies that are top quality. The entire ring has a
Category

21st Century and Contemporary American Band Rings

Materials

Diamond, Ruby, White Diamond, 24k Gold, Yellow Gold

Rose Gold Princess Diamond Double Halo Engagement Ring and Wedding Band Set
Located in Columbia, MO
in sparkly diamonds. The center princess cut diamond weighs 1/2 carat & grades as I/I1 in quality
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, White Diamond, Gold, 14k Gold, Rose Gold, White Gold

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25 Carat Diamond Ring Princess Cut For Sale on 1stDibs

Surely you’ll find the exact 25 carat diamond ring princess cut you’re seeking on 1stDibs — we’ve got a vast assortment for sale. Each design created in this style — which was crafted with great care and often made from gold, 18k gold and white gold — can elevate any look. You can easily find a 204 antique edition and 430 modern creations to choose from as well. You’re likely to find the perfect 25 carat diamond ring princess cut among the distinctive items we have available, which includes versions made as long ago as the 19th Century as well as those produced as recently as the 21st Century. There have been many well-made iterations of the classic 25 carat diamond ring princess cut over the years, but those made by Tiffany & Co., OGI Ltd and Roman Malakov are often thought to be among the most beautiful. A princess cut version of this piece has appeal, but there are also round cut and oval cut versions for sale. Finding a 25 carat diamond ring princess cut for sale for women should be easy, but there are 172 pieces available to browse for unisex as well as men, too.

How Much is a 25 Carat Diamond Ring Princess Cut?

On average, a 25 carat diamond ring princess cut at 1stDibs sells for $3,635, while they’re typically $132 on the low end and $720,000 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 25 Carat Diamond Ring Princess Cut
  • 1stDibs ExpertSeptember 28, 2021
    A princess cut diamond ring is a genre of the diamond cuts often used in engagement rings. Possessing the technical name square modified brilliant, these rings are peculiarly crafted into a square or a rectangle shape, giving it an exquisite look of an inverted pyramid with four beveled sides. Shop a range of antique and vintage princess cut diamond rings on 1stDibs.
  • 1stDibs ExpertSeptember 28, 2021
    Like with most diamond products, the price of a 1-carat princess cut diamond can range dramatically. On 1stDibs, find 1-carat princess cut diamond rings, earrings, necklaces and bracelets starting at $999 to $16,500.
  • 1stDibs ExpertNovember 8, 2023
    How big a 2-carat diamond with a princess cut is varies from piece to piece. However, the average size is 7 millimeters by 7 millimeters. The measurement is around 9/32 inches, so a 2-carat princess-cut diamond will be just a little over a quarter-inch in size. On 1stDibs, find an assortment of princess-cut diamond jewelry.