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4 Ct Natural Pear Garnet Engagement Ring 14kt
Located in New York, NY
4ct Natural Pear shape Garnet ring. 10 x 7mm Garnet. Clean clarity and transparent. Dark orange
Category

2010s American Engagement Rings

Materials

Garnet, 14k Gold, Yellow Gold

Edwardian 3.10 Ct. Diamond engagement Cluster Ring
Located in Napoli, IT
brilliant cut diamonds totalling approx 1.50 Ct (G-VVS/VS) UK size: N 1/4 US size: 6.75 Measures: head is 15
Category

Antique Early 1900s European Edwardian Engagement Rings

Materials

Diamond, 18k Gold, Platinum

Ladies' Platinum Diamond Solitaire Engagement Ring 0.65 ct
Located in Laguna Beach, CA
Ladies' diamond solitaire engagement ring. Tests platinum and weighs 4 grams gross weight. The
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Platinum

1.26 Ct, 18K Antique Style Diamond Engagement Ring
By Sebastian Bernard
Located in Los Angeles, CA
This Beautiful Engagement Ring is made in 18K Gold and hosts a 0.40 Ct Round Brilliant natural
Category

2010s American Art Nouveau Engagement Rings

Materials

Diamond, 18k Gold

18K Yellow Gold Diamond Engagement Ring 1.97 ct
Located in Laguna Beach, CA
of round brilliant diamonds on the sides, H, i, color range, Vs clarity. Ring size is 6 1/4 and can
Category

Mid-20th Century Engagement Rings

Materials

Diamond, 18k Gold, Yellow Gold

3.27 Ct Red Ruby Flanked with 0.92 Ct Oval Diamonds Engagement Ring
Located in Miami, FL
Offered here is a classic 3 stone engagement ring, simple yet so elegant. Featuring a large 3.27
Category

2010s Unknown Contemporary Engagement Rings

Materials

Diamond, Ruby, 18k Gold

1.50 CT Sapphire invisible Set & 0.85 CT Diamonds 18K Gold Engagement Ring
By Unbranded
Located in Los Angeles, CA
100% Authentic, 100% Customer Satisfaction Height: 11.5 mm Width: 4 mm Size: 6.5 ( Contact Us for
Category

2010s American Engagement Rings

Materials

Diamond, 18k Gold

1 1/4 Ct Oval Natural Ceylon Blue Sapphire Engagement Ring in 18 Karat Gold, MEN
Located in New York, NY
Oval Natural Blue Sapphire & Diamond Engagement Ring in 18 Karat Yellow Gold Approximately 1 1/4
Category

Early 2000s Engagement Rings

Materials

Diamond, Blue Sapphire, Gold, 18k Gold

Vintage Platinum 1.12 ct Old European Cut Diamond Engagement Ring
Located in Addison, TX
Own a piece of history with this beautiful vintage platinum engagement ring. Featuring a stunning
Category

Mid-20th Century Retro Engagement Rings

Materials

Diamond, Platinum

Estate 2.10 Ct. Antique Cushion Diamond Sapphire Halo Engagement Ring
Located in Napoli, IT
An estate Diamond and sapphire engagement ring featuring a 2.10 Ct antique cushion cut – old mine
Category

Mid-20th Century European Contemporary Engagement Rings

Materials

Diamond, Sapphire, Platinum

GIA Certified Art Deco 2.69 Ct. Old European Engagement Ring
Located in New York, NY
An antique old European cut diamond set in a classic Art Deco era setting, this engagement ring is
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

Retro Platinum & Round Mixed Cut 0.95 Ct Diamond Engagement Ring
Located in Philadelphia, PA
A fine retro diamond engagement ring. Set in a platinum mounting. With a ca. 0.95 ct round mixed
Category

Mid-20th Century Retro Engagement Rings

Materials

Diamond, Platinum

Beauvince Alana Engagement Ring (2.01 ct Radiant Cut GSI1 GIA Diamond)
By Beauvince Jewelry
Located in New York, NY
and creating a stunning engagement ring or alternate fine jewel for a perfectionist. With excellent
Category

2010s Engagement Rings

Materials

Diamond, White Diamond, 18k Gold, White Gold

Beauvince Cynthia Engagement Ring, '1.62 Ct Oval Diamond' in Yellow Gold
By Beauvince Jewelry
Located in New York, NY
Chic and delicate, this Oval solitaire engagement rings features uniquely set baguette diamond
Category

2010s Engagement Rings

Materials

Diamond, White Diamond, 14k Gold, Yellow Gold

Tiffany & Co. Platinum True Round Diamond Engagement Ring .20 ct EVS1
By Tiffany & Co.
Located in New York, NY
Tiffany & Co. engagement ring from the True collection finely crafted in 4 prongs with a basket
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, White Diamond, Platinum

Art Deco 0.80 Ct. Diamond Engagement Ring H SI2 in Platinum
Located in New York, NY
Get deco’d out with this chic and classic Art Deco engagement ring. Thanks to its open table and
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

Art Deco GIA Certified 0.95 Ct. Platinum Engagement Ring I VS2
Located in New York, NY
This is as classic as it gets for an Art Deco engagement ring design. We have a GIA graded old
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

Edwardian 12 MM. Natural Split Pearl 1.60 Ct Diamond Engagement Ring
Located in Napoli, IT
Effective statement to show off or one off engagement ring Excellent condition in spite of being such an old
Category

Antique Early 1900s European Edwardian Engagement Rings

Materials

Diamond, Pearl, Platinum, 18k Gold

Art Deco GIA Certified 1.10 Ct. Diamond Engagement Ring K VS1
Located in New York, NY
: 1.10 ct. Old European Color/Clarity: K / VS1, GIA Certified Accent Stones Type: (4) Early Round
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

18kt White Gold 4 Ct No Heat Vivid Ruby Ring, 1.5 Ct Diamonds, CGL Certificate
Located in Antwerp, BE
Magnificent 18kt White Gold 4.02ct No Heat Vivid Red Ruby Ring, With 1.52ct Diamonds With CGL
Category

21st Century and Contemporary Artisan Engagement Rings

Materials

Diamond, Ruby, 18k Gold, White Gold, Yellow Gold

Art Deco Style Platinum Diamond + Sapphire Engagement Ring 1.74 Ct Center
Located in Narberth, PA
An outstanding contemporarily made engagement ring in the Art Deco style! This stunning piece is
Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Sapphire, Platinum

Victorian 2 ct Old Mine Cut Diamond Engagement Ring 18k Gold & Plat
Located in Joelton, TN
2.ct Old Mine Cut Victorian Diamond Engagement Ring. Clarity VS1-2, Color I-K Size 7 3/4 Circa
Category

Antique Late 19th Century English Late Victorian Engagement Rings

Materials

Diamond, Yellow Gold, 18k Gold, Platinum

Beauvince Iraa Engagement Ring '1.70 Ct Asscher Cut HVVS1 GIA Diamond'
By Beauvince Jewelry
Located in New York, NY
Setting: Prong Set Head Style: 4 Prong Head Finger Size: 6.5 To have the ring sized, please note the
Category

2010s Engagement Rings

Materials

Diamond, White Diamond, Pink Diamond, 18k Gold, Rose Gold, Platinum

GRS 18K 7.34 Ct Colombia Emerald&Diamond Antique Art Deco Engagement Ring
Located in Kaohsiung City, TW
** GRS-Certified 18K 7.34 Ct Colombia Emerald&Diamonds Engagement Ring ** One certified natural
Category

21st Century and Contemporary Taiwanese Contemporary Engagement Rings

Materials

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

Beauvince Ripples Engagement Ring, '1.05 Ct Oval KSI2 EGLUSA Diamond' in Gold
By Beauvince Jewelry
Located in New York, NY
The Ripples engagement ring is one of a kind engagement or statement solitaire ring featuring bold
Category

2010s Engagement Rings

Materials

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

2.01 ct GIA Fancy Yellowish Orange Cushion Diamond Halo Engagement Ring
By J. Birnbach
Located in New York, NY
This ring features a 2.01 carat cut-cornered rectangular modified brilliant diamond, of VS2 clarity
Category

21st Century and Contemporary American Engagement Rings

Materials

Diamond, Platinum

Beauvince Cushion Cut 3 Stone Engagement Ring (3.02 ct HVS1 GIA Diamond)
By Beauvince Jewelry
Located in New York, NY
This beautiful Cushion Cut Diamond Engagement Ring features a stunning 3 carat Solitaire with
Category

2010s Contemporary Engagement Rings

Materials

Diamond, 18k Gold

Vintage GIA Certified 0.77 Ct. Two-Tone Diamond Engagement Ring H SI1
Located in New York, NY
This charming engagement ring features the sweetest 0.77 ct. old European cut as its center. Held
Category

20th Century Unknown Engagement Rings

Materials

Diamond, Platinum

Estate Natural No Heat 3.31 Ct Blue Sapphire Diamond Engagement Solitaire Ring
Located in Napoli, IT
certified oval faceted cut natural unheated sapphire of 3.31 Ct – 4 rectangular faceted diamonds totaling
Category

Late 20th Century European Contemporary Engagement Rings

Materials

Diamond, Blue Sapphire, 18k Gold

Beauvince Love Engagement Ring, '0.71 Ct Princess GVS Diamond' in White Gold
By Beauvince Jewelry
Located in New York, NY
A testament of young love, this Princess engagement ring with heart like accents is symbolic of
Category

2010s Engagement Rings

Materials

Diamond, White Diamond, 18k Gold, White Gold

Art Deco GIA Certified 1.07 Ct. Old European cut Engagement Ring, Platinum
Located in New York, NY
Here's a charming Art Deco era platinum engagement ring, sure to win any girl's heart. A super
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

Art Deco GIA Certified 2.00 Ct. Engagement Ring N VS2 in Platinum
Located in New York, NY
Accent Stones: (4) single cut diamonds Accent Stone Weight: 0.10 ct. Accent Color/Clarity: I-J / SI Ring
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

Art Deco 0.75 Ct. Diamond Engagement Ring G SI1 in 14k Gold
Located in New York, NY
the deco-era engagement ring. At 0.75 carats with a large table and wide open culet, we can't stop
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Gold, 14k Gold

Edwardian 0.96 Ct. Wreath Motif Diamond Engagement Ring M SI1 in Platinum
Located in New York, NY
A beautiful and unique engagement ring by any standard, this Edwardian beauty stands out with its
Category

Early 20th Century Unknown Edwardian Engagement Rings

Materials

Diamond, Platinum

4 Carat Marquise Cut Diamond Engagement Ring GIA Certified LY SI1
Located in New York, NY
KATE -4 CT HALO MARQUISE DIAMOND ENGAGEMENT RING BY MIKE NEKTA GIA CERTIFIED Center Diamond
Category

2010s American Engagement Rings

Materials

Diamond, 18k Gold, Yellow Gold

Beauvince Blossoms Engagement Ring '1.21 Ct Round GSI2 Diamond' in White Gold
By Beauvince Jewelry
Located in New York, NY
solitaire diamond engagement is floral and earthy in nature. Center Diamond Shape: Round Center Diamond
Category

2010s Engagement Rings

Materials

Diamond, White Diamond, White Gold, 14k Gold

4 Carat Round Cut Diamond Engagement Ring GIA Certified D* VVS1
Located in New York, NY
ANN SOLITAIRE DIAMOND ENGAGEMENT RING 18K WHITE GOLD GIA CERTIFIED 3 CT D* VVS1 BY MIKE NEKTA GIA
Category

2010s American Engagement Rings

Materials

Diamond, 18k Gold, White Gold

GIA Certified 4 Ct Three Stone Radiant Trillion Cut Diamond Ring
By Antinori Fine Jewels
Located in Rome, IT
Exquisite three stone diamond ring composed by a GIA certified 4.02 Carat Radiant Cut diamond and
Category

2010s Italian Modern Engagement Rings

Materials

Diamond, White Diamond, 18k Gold, White Gold

GIA Certified Round Brilliant Diamond Solitaire Engagement Ring 5.01 ct J/VVS2
Located in London, GB
A beautiful platinum diamond engagement ring. The ring comprises of a round brilliant cut diamond
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Platinum

1.55 Ct. Aquamarine Blue Sapphire Diamond Engagement Ring in 18K White Gold
Located in Bangkok, TH
An absolutely breathtaking aquamarine with blue sapphire and diamond Art Deco style gold ring
Category

21st Century and Contemporary Thai Art Deco Engagement Rings

Materials

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

Art Nouveau .75 Ct Diamond F VVS/VS Platinum Rare Engagement ring
Located in Napoli, IT
diamonds totalling approx .50 Ct (F/H-VVS/VS) UK size: O 1/4 US size: 7.25 Measures: head is 13 x18 mm. (h
Category

Early 20th Century European Art Nouveau Engagement Rings

Materials

Diamond, Platinum

2.20 Ct. Tourmaline Ruby Diamond Vintage Inspired Engagement Ring in 14K Gold
Located in Bangkok, TH
Crafted in 14k rose gold, this fanciful contemporary, Art Deco inspired ring sees a raised an
Category

21st Century and Contemporary Thai Art Deco Engagement Rings

Materials

Diamond, Ruby, Tourmaline, 14k Gold, Rose Gold

4 Carat Emerald Cut Diamond Engagement Ring GIA Certified E VVS
Located in New York, NY
3.28 CT E VVS2 BY MIKE NEKTA NOOR DIAMOND ENGAGEMENT PLATINUM RING BY MIKE NEKTA GIA CERRTIFIED
Category

2010s American Engagement Rings

Materials

Diamond, Platinum

Real Natural 2 Carat Ct Round Solitaire Diamond Engagement Ring 14k Gold 1
Located in New York, NY
Stunning approx. 2 Carat natural round brilliant diamond hidden halo engagement ring in 14k yellow
Category

2010s American Engagement Rings

Materials

Diamond, 14k Gold

Real Natural 2 Carat Ct 1 Solitaire Round Diamond Engagement Ring 14k Gold
Located in New York, NY
Stunning approx. 2 Carat natural round brilliant diamond hidden halo engagement ring in 14k yellow
Category

2010s American Engagement Rings

Materials

Diamond, 14k Gold

Real Natural 2 Carat Ct Round Solitaire Diamond Engagement Ring 14k Yellow Gold
Located in New York, NY
Stunning approx. 2 Carat natural round brilliant diamond hidden halo engagement ring in 14k yellow
Category

2010s American Engagement Rings

Materials

Diamond, Yellow Gold

Leon Mege Platinum Engagement Ring with 1.66 Ct Old European Cut Diamond
By Leon Mege
Located in New York, NY
blocking its majestic beauty. Finger size: US - 5 3/4 1.66 ct H/SI2 Old European cut diamond; GIA
Category

2010s Contemporary Engagement Rings

Materials

Diamond, Platinum

Late 19th C. 0.67 Ct. Two Tone Yellow Gold Engagement Ring K SI1
Located in New York, NY
This antique engagement ring is romance personified. A buttercup setting holds a mesmerizing 0.67
Category

Antique Late 19th Century Unknown Engagement Rings

Materials

Diamond, Yellow Gold, 18k Gold, Platinum

Mid-Century GIA Certified 0.70 Ct. Diamond Engagement Ring J VS1 in Platinum
Located in New York, NY
perfect under 1 carat engagement ring option. Diamond Details: Primary Stone: 0.70 ct. Old European
Category

Mid-20th Century Unknown Engagement Rings

Materials

Diamond, Platinum

3.60 Ct Pear Shape Pink Topaz 18K Split Shank Engagement Ring with Halo
By Sebastian Bernard
Located in Los Angeles, CA
gold Pave set Engagement Ring with Halo with total diamond weight of 1.40 Ct. on the side. Center
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Topaz, 18k Gold

Beauvince Bianca Engagement Ring (2.01 ct Oval HVS2 GIA Diamond) in White Gold
By Beauvince Jewelry
Located in New York, NY
]A sultry classic, this full bodied oval diamond engagement ring is a stunner with its measurements
Category

2010s Engagement Rings

Materials

Diamond, White Diamond, 18k Gold, White Gold

GIA 17.63 Ct Yellow SI2 Cushion Diamond Pave 18K Engagement Ring with Halo
By Sebastian Bernard
Located in Los Angeles, CA
18k Gold Pave set Split Shank Diamond Engagement Ring with halo. The ring has total weight of 0.90 Ct
Category

21st Century and Contemporary American Contemporary Engagement Rings

Materials

Diamond, Yellow Diamond, 18k Gold

Art Deco GIA Certified 1.55 Ct. Diamond Engagement Ring M VS1 in Platinum
Located in New York, NY
Weight: 1.65 ct. Material: Platinum This ring is currently size 4 and can be resized. Complimentary
Category

Early 20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

David Rosenberg 4.03 Ct Cushion Fancy Intense Yellow GIA Diamond Engagement Ring
By David Rosenberg
Located in Boca Raton, FL
weight of .68 & continues its elegance with a yellow halo .23 carat total weight with 4 micro paves down
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

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

Beauvince Aisha Engagement Ring (2.00 ct Round ISI1 GIA Diamond) in White Gold
By Beauvince Jewelry
Located in New York, NY
Gold Setting: Prong Set Head Style: 4 Prong Setting Finger Size: 6.5 To have the ring sized, please
Category

2010s Engagement Rings

Materials

Diamond, White Diamond, 18k Gold, White Gold

Art Deco GIA Certified 1.02 Ct. Diamond Engagement Ring M SI1 in Platinum
Located in New York, NY
) single cut diamonds Accent Stone Weight: 0.28 ct. Accent Color/Clarity Ring Specifications: Total
Category

Vintage 1920s Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

1 1/3 Ct Natural Real Round Solitaire Diamond Halo Engagement Ring 14k Gold
Located in New York, NY
Classic 1 1/3 Ct brilliant round solitaire diamond halo engagement ring in 14k white gold. The
Category

2010s American Engagement Rings

Materials

Diamond, 14k Gold, White Gold

1.50 Ct. Aquamarine and Diamond Art Deco Style Engagement Ring in 18K Gold
Located in Bangkok, TH
gorgeous designed ring for today’s lifestyles with yesterday’s visual vibe. Art Deco in style, this natural
Category

21st Century and Contemporary Thai Art Deco Engagement Rings

Materials

Aquamarine, Diamond

TJD 0.66 Carat 18 Karat White Gold 4 Prong Diamond Engagement Ring
By TJD
Located in New York, NY
commitment. Crafted in 18 karat white gold, this engagement ring features 0.38 ct centre stone and 0.28 ct of
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, White Gold

0.76 Ct. H VS2 GIA Hearts on Fire Dream Cut Platinum Diamond Engagement Ring
By Hearts On Fire
Located in New York, NY
Hearts on Fire diamond engagement ring finely crafted in platinum featuring a signature square
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, Platinum

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4 Ct Engagement Ring For Sale on 1stDibs

Find the exact 4 ct engagement ring you’re shopping for in the variety available on 1stDibs. Every item for sale was constructed with extraordinary care, often using Gold, Platinum and 18k Gold. You can easily find a 368 antique edition and 604 modern creations to choose from as well. If you’re looking for a 4 ct engagement ring 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 piece, .5 Carat and 1 Carat are consistently popular carat weights. A 4 ct engagement ring from Tiffany & Co., Sarosi By Timeless Gems and Cartier — each of whom created a beautiful version of this treasured accessory — is worth considering. While most can agree that any 4 ct engagement ring from our collection can easily elevate most outfits, but the choice of a Diamond version from the 799 available is guaranteed to add a special touch to your ensemble. Today, if you’re looking for a round cut version of this piece and are unable to find the perfect match, our selection also includes oval cut and emerald cut alternatives. Finding a 4 ct engagement ring for sale for women should be easy, but there are 234 pieces available to browse for unisex as well as men, too.

How Much is a 4 Ct Engagement Ring?

Prices for a 4 ct engagement ring can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $144 and can go as high as $4,450,000, while this accessory, on average, fetches $10,817.

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 4 Ct Engagement Ring
  • 1stDibs ExpertNovember 8, 2023
    The 4Cs of engagement rings are cut, color, clarity and carat weight, but this doesn�t pertain solely to engagement rings. Established by the Gemological Institute of America (GIA), the 4Cs are the guidelines that determine how diamonds are graded. A diamond�s cut pertains to how the stone�s facets interact with the light. There are five main categories of color (judged on the tone and saturation): colorless, near colorless, faint, very light and light. According to the GIA, �clarity is the relative absence of inclusions and blemishes� in a diamond (inclusions are internal features and blemishes refers to surface irregularities). Also per the GIA, �Diamonds are weighed to a thousandth (0.001) of a carat and then rounded to the nearest hundredth, or point. Over a carat, diamond weights are usually expressed in carats and decimals.� Keep in mind that because a three-carat gem can be less valuable then a one-carat stone, weight is not the most important signifier of a stone�s value. Explore a large collection of engagement rings on 1stDibs.