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23 Carat Diamond Necklace

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30 Carat Oval Shape Natural Emerald & 23 Carat Diamond Necklace in 18 Karat Gold
Located in New York, NY
30 Carat Oval Shape Natural Emerald & 23 Carat Diamond Necklace in 18 Karat Gold This spectacular
Category

2010s Drop Necklaces

Materials

Diamond, Emerald, 18k Gold

23 Carat Round Brilliant Diamond Riviera Necklace Certified
Located in New York, NY
Introducing the Earth Mined Diamond Necklace for Ladies. This beautiful necklace features a
Category

2010s American Beaded Necklaces

Materials

Diamond, 14k Gold, White Gold

23 Carat Round Diamond 18K White Gold Riviera Tennis Necklace
By Antinori Fine Jewels
Located in Rome, IT
This exquisite Riviera tennis necklace boasts a total of 23 carats of dazzling diamonds. The
Category

2010s Italian Contemporary Chain Necklaces

Materials

Diamond, Gold, 18k Gold, White Gold

23 Carat Round Brilliant Cut Diamonds 18K Yellow Gold Tennis Necklace
By Antinori Fine Jewels
Located in Rome, IT
our exquisite 23 Carat Diamond Tennis Necklace. Each diamond is meticulously selected for its superior
Category

2010s Unknown Contemporary Link Necklaces

Materials

Diamond, 18k Gold, Yellow Gold

1.65 Carat Mini Diamond Necklace Chain 14 Karat Yellow Gold 23"''
Located in Great Neck, NY
Beautiful 14 Karat Yellow Gold Round Brilliant Cut Diamond Tennis Necklace Chain set on 4 prong
Category

2010s American More Necklaces

Materials

Diamond, White Diamond, 14k Gold, Yellow Gold

1.67 Carat Mini Diamond Necklace Chain 14 Karat Yellow Gold 23''
Located in Great Neck, NY
Beautiful 14 Karat Yellow Gold Round Brilliant Cut Diamond Tennis Necklace Chain set on 4 prong
Category

2010s American More Necklaces

Materials

Diamond, White Diamond, 14k Gold, Yellow Gold

Important Harry Winston Diamond 23 Carat Certified Emerald Pendant Necklace
By Harry Winston
Located in New York, NY
Important Harry Winston Diamond 23 Carat Certified Emerald Pendant Necklace An 18k gold and
Category

Vintage 1960s American Pendant Necklaces

Materials

Diamond, Emerald, 18k Gold, Platinum

Important Natural 23 Carat Ceylon Sapphire Diamond Necklace 1950s Provenance
Located in Lisbon, PT
Important one-of-a-kind 23-carat Ceylon natural no-heat sapphire and diamond convertible necklace
Category

Vintage 1950s Portuguese Modern More Necklaces

Materials

Diamond, Sapphire, Gold, White Gold

Spectacular 23 Carat Round Brilliant Cut Diamond Tennis Riviera Necklace
By Antinori Fine Jewels
Located in Rome, IT
The necklace weighs 23 carat, with 3 prongs setting.
Category

2010s Unknown Modern Multi-Strand Necklaces

Materials

Diamond, 18k Gold, White Gold

Mid Century 23 Carat Diamond Twin Strand Rivière Necklace
Located in Santa Barbara, CA
This astonishing double-strand diamond Rivière necklace certainly delivers the wow factor. Carrying
Category

Mid-20th Century Retro Multi-Strand Necklaces

Materials

Diamond, Platinum

Vintage Pearl and 23 Carat Ruby Strand Turquoise and Diamond Clasp Necklace
Located in Jesmond, Newcastle Upon Tyne
necklace with a 4.20 carat turquoise and 3.38 carat diamond, 18 karat yellow gold clasp; part of our
Category

1990s Unknown Pendant Necklaces

Materials

Diamond, Pearl, Ruby, Turquoise, Yellow Gold

Floating diamonds pendant necklace 14KT1.18ct diamond pendant necklace 23" LONG
Located in Jupiter, FL
Beautiful diamonds pendant necklace, floating diamonds under the glass and long chain at 23
Category

21st Century and Contemporary Pendant Necklaces

GIA Certified 23 Carat Aquamarine and Diamond Necklace in White and Yellow Gold
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This exquisite necklace features an exceptionally fine 23.67 carat octagonal aquamarine with
Category

21st Century and Contemporary North American Artisan Pendant Necklaces

Materials

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

2.09 Carat Diamond Yellow Gold Chain Necklace
By DGI
Located in Los Angeles, CA
This Chain Necklace has a V-Shaped Necklace that has 23 Round Cut Diamonds (Clarity: SI, Color: F
Category

21st Century and Contemporary American Contemporary Chain Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

5 Carat Diamond Necklace 14 Karat Gold Round Riveria Diamond Choker Necklace
By Five Star Jewelry
Located in Austin, TX
diamond necklace is made with natural, high quality, round brilliant diamonds that weigh OVER 5 CARATS
Category

21st Century and Contemporary American Modern Choker Necklaces

Materials

Diamond, 14k Gold, White Gold

7.00 Carat Diamond Platinum Edwardian Pendant Necklace
Located in Stamford, CT
Edwardian Belle Époque diamond pendant necklace. Circa 1910. Three section diamond filled hinged
Category

Early 20th Century Pendant Necklaces

Materials

Diamond, Platinum

Pave Diamond Star Necklace 14k Yellow Gold w 23 Diamonds on Cable Chain
By Five Star Jewelry
Located in Austin, TX
Style: Attached Diamond Number: 23 Diamond Shape: Round Brilliant Diamond Total Weight: .05 ct
Category

21st Century and Contemporary American Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

Necklace Alma David Locco Diamonds 18K White Gold diamonds sustainable
By DAVID LOCCO SUSTAINABLE DIAMONDS
Located in VALDEMORO, ES
FOR EXCHANGES AND RETURNS DIAMONDS WITH LIFETIME WARRANTY CHARACTERISTICS Purity: VVS/VS Carats: 23
Category

2010s Spanish Modern Chain Necklaces

Materials

Diamond, Rose Gold

Necklace Alma David Locco Diamonds 18K Yellow Gold diamonds sustainable
By DAVID LOCCO SUSTAINABLE DIAMONDS
Located in VALDEMORO, ES
FOR EXCHANGES AND RETURNS DIAMONDS WITH LIFETIME WARRANTY CHARACTERISTICS Purity: VVS/VS Carats: 23
Category

2010s Spanish Modern Chain Necklaces

Materials

Diamond, Rose Gold

1.41 Carat All Natural Diamond Tennis Drop Necklace
Located in Great Neck, NY
Stunning 14k yellow gold tennis drop necklace with 1.41 cts all natural diamonds, 34 pieces
Category

2010s American Drop Necklaces

Materials

Diamond, 14k Gold

TJD 0.33 Carat Natural Diamond 14KT Gold Cushion Frame Pendant Necklace
By TJD
Located in New York, NY
0.33 carats. All the diamonds are H-I color, I-2 clarity. This white gold halo pendant will come along
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

60.27 Carat Brown Yellow Diamond Necklace
Located in New York, NY
-yellow colors. 23 diamonds weighing a total of 60.27 carats. The diamonds were certified by GIA but the
Category

21st Century and Contemporary American Drop Necklaces

Materials

Yellow Diamond, Brown Diamond, White Gold, 10k Gold

Necklace Alma David Locco Diamonds Rose Gold | Colorless diamonds 18K sustainabl
By DAVID LOCCO SUSTAINABLE DIAMONDS
Located in VALDEMORO, ES
FOR EXCHANGES AND RETURNS DIAMONDS WITH LIFETIME WARRANTY CHARACTERISTICS Purity: VVS/VS Carats: 23
Category

2010s Spanish Modern Chain Necklaces

Materials

Diamond, Rose Gold

TJD 0.50 Carat Natural Diamond 14 Karat White Gold Circle Pendant Necklace
By TJD
Located in New York, NY
This diamond circle pendant fits any occasion with ease. This beautiful diamond pendant necklace is
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.33 Carat Natural Diamond 14KT Gold Cushion Frame Cluster Pendant Necklace
By TJD
Located in New York, NY
This beautiful cushion pendant necklace is studded with 57 brilliant cut round diamonds and
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.20 Carat Natural Diamond 14KT Gold Cushion Frame Halo Pendant Necklace
By TJD
Located in New York, NY
diamonds in prong and channel setting. The total diamond weight of these pendant is 0.20 carats. All the
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.25 Carat Natural Diamond 14KT Gold Cushion Frame Halo Pendant Necklace
By TJD
Located in New York, NY
cut natural diamonds in prong setting. The total diamond weight of these pendant is 0.25 carats. All
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.07 Carat Natural Diamond 14 Karat Gold Vine Circle Pendant Necklace
By TJD
Located in New York, NY
This beautiful circle pendant necklace is studded with 24 single cut round diamonds in prong
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

23CT VVS Diamond Tennis Necklace
Located in Miami, FL
Features: Material: The necklace is made of 14-karat yellow gold. It has 23 carats of diamonds with very
Category

21st Century and Contemporary European Contemporary Necklace Enhancers

Materials

Diamond, 14k Gold

TJD 0.50 Carat Natural Diamond 14 Karat White Gold Eternity Pendant Necklace
By TJD
Located in New York, NY
in prong setting. The total diamond weight of these diamond pendant is 0.50 carats. All the diamonds
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.25 Carat Natural Diamond 14 Karat Gold Cluster Circle Pendant Necklace
By TJD
Located in New York, NY
pendant. The total diamond weight 0.25 carat and this Pendant suspends along with a cable chain.
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

Ruby Diamond 18 Carat Gold Necklace
Located in Berlin, DE
Pavé Set with 23 cabochon-cut rubies weighing 13,4 ct. and 435 ball shape rubies weighing
Category

Mid-20th Century Art Deco Drop Necklaces

Materials

Diamond, Ruby, 18k Gold, White Gold

0.23 Carat Diamond Chain Necklace 14 Karat White Gold
By DGI
Located in Los Angeles, CA
This Chain Necklace has a Whale Tail as its shape and has 23 Round Cut Diamonds that weigh 0.23
Category

21st Century and Contemporary American Contemporary Chain Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.50 Carat Natural Diamond 14 Karat Gold Oval Frame Halo Pendant Necklace
By TJD
Located in New York, NY
This beautiful oval pendant necklace is studded with 40 single cut, brilliant cut round diamonds
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.10 Carat Natural Diamond 14KT White Gold Heart in Circle Pendant Necklace
By TJD
Located in New York, NY
Show your love with this heart diamond pendant. This beautiful pendant necklace is studded with 38
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.10 Carat Natural Diamond 14KT Rose Gold Heart in Circle Pendant Necklace
By TJD
Located in New York, NY
Show your love with this heart diamond pendant. This beautiful pendant necklace is studded with 38
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, Rose Gold

TJD 0.50 Carat Natural Diamond 14 Karat Yellow Gold Oval Drop Pendant Necklace
By TJD
Located in New York, NY
This diamond drop pendant fits any occasion with ease. This beautiful diamond pendant necklace is
Category

2010s Indian Modern Pendant Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

TJD 0.50 Carat Natural Diamond 14 Karat White Gold Open Circle Pendant Necklace
By TJD
Located in New York, NY
this head-turning pendant. The total diamond weight 0.50 carat and this Pendant suspended along with a
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

TJD 0.33 Carat Baguette Cut Diamond 14 Karat Gold Open Circle Pendant Necklace
By TJD
Located in New York, NY
this head-turning pendant. The total diamond weight 0.33 Carat and this Pendant suspends along with an
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

TJD 0.25 Carat Natural Diamond 14 Karat Yellow Gold Rope Frame Pendant Necklace
By TJD
Located in New York, NY
diamond weight 0.25 carat and this Pendant suspends along with a cable chain.
Category

2010s Indian Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

34 Carat Round Brilliant Diamond Opera Necklace Certified
Located in New York, NY
For Unisex Earth Mined Diamond: Carat Weight: 33.50 Carats Style: Round Brilliant Cut Setting: 3
Category

2010s American Chain Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

14 Karat Rose Gold 0.07 Carat Diamond Safety Pin Necklace
Located in Great neck, NY
This is an adorable safety pin necklace crafted of 14K Rose Gold, featuring 23 round natural White
Category

21st Century and Contemporary Chinese Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, Rose Gold

0.13 Ct Diamond Interlocking Rings Necklace in 14K Gold
By Oshi Jewels
Located in Bangkok, TH
Dainty interlocking two circle diamond necklace, Eternity circle necklace / Gifts for her
Category

21st Century and Contemporary Thai Modern Necklace Enhancers

Materials

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

Peter Suchy GIA Certified 1.00 Carat Diamond White Gold Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Pear shape diamond pendant necklace. GIA certified 1.00 carat pear shaped diamond set in a 14k
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Gold, 14k Gold, White Gold

1.41 Carat All Natural Diamond Tennis Drop Necklace in 14K Yellow Gold
Located in Great Neck, NY
Stunning 14k yellow gold tennis drop necklace with 1.41 cts all natural diamonds, 34 pieces
Category

2010s American Drop Necklaces

Materials

Diamond, Yellow Gold

Tanzanite Necklace With Diamonds 2.74 Carats 14K White Gold
Located in Laguna Niguel, CA
= 2.53 Carat 39 Round Diamonds = 0.21 Carats Metal: 14K White Gold Pendant Dimensions: 23 x 12 mm
Category

21st Century and Contemporary Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, Tanzanite, Gold, 14k Gold, White Gold

Peter Suchy GIA Certified Oval 2.50 Carat Sapphire Diamond Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Crisp and bright sapphire and diamond in a classic pendant necklace. A stunning 2.50 Carat oval
Category

21st Century and Contemporary Pendant Necklaces

Materials

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

1.00 Carat Sapphire Diamond Halo White Gold Heart Pendant Necklace
Located in Stamford, CT
Sapphire and diamond heart pendant necklace. Invisible set blue square sapphire heart with a halo
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Sapphire, Blue Sapphire, Gold, 14k Gold, 18k Gold, White Gold

Peter Suchy EGL Certified .76 Carat Diamond White Gold Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Diamond pendant necklace. Old European cut diamond set in a 14k white gold basket pendant setting
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Gold, 14k Gold, White Gold

0.33 Carat Natural Diamond Pendant Necklace G SI 14K White Gold
Located in New York, NY
0.33 Carat Natural Diamond Pendant Necklace 14K White Gold 100% Natural Diamonds, Not Enhanced in
Category

21st Century and Contemporary American Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

IGI Certified 26.58 Carat Burma Ruby & 18.85 Carat Diamond Necklace in 18K Gold
Located in KOWLOON, HK
focal point of this necklace is the 23 heart-shaped natural rubies, totaling 26.58 carats, each exuding
Category

2010s Hong Kong Modern Choker Necklaces

Materials

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

18k Gold Diamond Cross Necklace Religious Diamond Necklace
By Oshi Jewels
Located in Bangkok, TH
:- Round - Total CTW :- 0.13 ctw. - Number of Diamonds :- 23 Pcs. - Diamond Size :- 1 MM. - Setting Type
Category

21st Century and Contemporary Thai Modern Pendant Necklaces

Materials

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

14K Gold Diamond Cross Necklace Religious Diamond Necklace
By Oshi Jewels
Located in Bangkok, TH
:- Round - Total CTW :- 0.13 ctw. - Number of Diamonds :- 23 Pcs. - Diamond Size :- 1 MM. - Setting Type
Category

21st Century and Contemporary Thai Modern Pendant Necklaces

Materials

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

Heart Necklace in diamonds (Approx. 7 carats) and white Gold
Located in Monte Carlo, MC
White gold heart necklace fully paved with round cut diamonds, for approximately 7 carats, and its
Category

Mid-20th Century European Pendant Necklaces

Materials

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

Heart Necklace in diamonds (Approx. 7 carats) and white Gold
Heart Necklace in diamonds (Approx. 7 carats) and white Gold
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H 1.58 in W 1.19 in L 9.06 in
0.20 Carat Natural Diamond Horseshoe Necklace Pendant 14K White Gold Chain
Located in New York, NY
100% Natural Diamonds, Not Enhanced in any way Round Cut Diamond Necklace with 18'' chain 0.20CT
Category

21st Century and Contemporary American Contemporary Pendant Necklaces

Materials

Diamond, 14k Gold, White Gold

Victorian 1.30 Carat Sapphire and Diamond Necklace, circa 1880s
Located in London, GB
. The beautiful sapphire is 1.30 carat and is surrounded by a heart shaped halo of old cut diamonds. The
Category

Antique 1880s Unknown Victorian Pendant Necklaces

Materials

Sapphire, Diamond, 18k Gold, Silver

1 Carat Diamond Heart Pendant/ Necklace 14 Karat White Gold with Chain
Located in New York, NY
Approximately 1 Ct Diamond Heart Pendant/ Necklace 14 Karat White Gold with Chain Diamond Weight
Category

2010s Drop Necklaces

Materials

Diamond, White Gold, 14k Gold

Iolite Pendant Necklace With Diamonds 1.71 Carats 14K Yellow Gold
Located in Laguna Niguel, CA
23 Diamonds = 0.18 Carats Metal: 14K Yellow Gold Pendant Dimensions: 19 x 11 mm
Category

21st Century and Contemporary Contemporary Pendant Necklaces

Materials

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

14k Gold Diamond Cross Necklace Lariat Diamond Cross Necklace
By Oshi Jewels
Located in Bangkok, TH
Diamond Cross Necklace is made of 14k solid gold available in three colors of gold, Rose Gold
Category

21st Century and Contemporary Thai Gothic Revival Chain Necklaces

Materials

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

18k Gold Diamond Cross Necklace Lariat Diamond Cross Necklace
By Oshi Jewels
Located in Bangkok, TH
Diamond Cross Necklace is made of 18k solid gold available in three colors of gold, Rose Gold
Category

21st Century and Contemporary Thai Gothic Revival Chain Necklaces

Materials

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

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23 Carat Diamond Necklace For Sale on 1stDibs

Find the exact 23 carat diamond necklace you’re shopping for in the variety available on 1stDibs. Frequently made of Gold, 18k Gold and White Gold, this item was constructed with great care. Our collection of these items for sale includes 26 vintage editions and 80 modern creations to choose from as well. Making the right choice when shopping for a 23 carat diamond necklace may mean carefully reviewing examples of this item dating from different eras — you can find an early iteration of this piece from the 20th Century and a newer version made as recently as the 21st Century, both of which have proven very popular over the years. There have been many well-made iterations of the classic 23 carat diamond necklace over the years, but those made by Emilio!, FERRUCCI and LB Exclusive are often thought to be among the most beautiful. A round cut version of this piece has appeal, but there are also pear cut and cushion cut versions for sale. Most of our 23 carat diamond necklace for sale are for women, but there are 30 pieces available to browse for men.

How Much is a 23 Carat Diamond Necklace?

On average, a 23 carat diamond necklace at 1stDibs sells for $10,965, while they’re typically $450 on the low end and $322,240 for the highest priced versions of this item.

Finding the Right necklaces for You

We are fortunate to know much of the world’s long and dazzling history of necklaces, as this type of jewelry was so treasured that it was frequently buried with its owners.

Lapis lazuli beads adorned necklaces unearthed from the royal graves at the ancient Iraqi civilization of Sumer, while the excavation of King Tut’s burial chamber revealed a sense of style that led to a frenzy of Art Deco designs, with artisans of the 1920s seeking to emulate the elegant work crafted by Ancient Egypt’s goldsmiths and jewelry makers. 

In ancient times, pendant necklaces worn by royalty and nobles conferred wealth and prestige. Today, wearing jewelry is about personal expression: Luxury diamond necklaces exude confidence and can symbolize the celebratory nature of a deep romantic relationship, while paper-clip chain-link necklaces designed by the likes of goldsmith Faye Kim are firmly planted in the past as well as the present. Kim works exclusively with eco-friendly gold, and these fashionable, fun accessories owe to the design of 19th-century watch fobs. 

For some, necklaces are thought of as being a solely feminine piece, but this widely loved accessory has been gender-neutral for eons. In fact, just as women rarely took to wearing a single necklace during the Renaissance, men of the era layered chains and valuable pendants atop their bejeweled clothing. In modern times, the free-spirited hippie and counterculture movements of the 1960s saw costume-jewelry designers celebrating self-expression through colorful multistrand necklaces and no shortage of beads, which were worn by anyone and everyone. 

Even after all of these years, the necklace remains an irrefutable staple of any complete outfit. Although new trends in jewelry are constantly emerging, the glamour and beauty of the past continue to inform modern styles and designs. In a way, the cyclical history of the necklace differs little from its familiar looped form: The celebrated French jewelry house Van Cleef & Arpels found much inspiration in King Tut, and, now, their Alhambra collection is a go-to for modern royals. Vintage necklaces designed by David Webb — whose work landed him on the cover of Vogue in 1950, two years after opening his Manhattan shop — were likely inspired by the ornamental styles of ancient Greece, Mesopotamia and Egypt

On 1stDibs, browse top designers like Cartier, Tiffany & Co. and Bulgari, or shop by your favorite style, from eye-catching choker necklaces to understated links to pearl necklaces and more. 

Questions About 23 Carat Diamond Necklace
  • 1stDibs ExpertNovember 6, 2023
    There is no hard-and-fast rule for how many carats a diamond necklace should be. On average, solitaire diamond necklaces range from 0.5 to 1 carat, but you can find pieces with larger and smaller stones. Tennis chains that feature continuous diamonds set into links usually have much higher total carat weights. For example, one might feature 60 individual diamonds, each 0.20 carats in size, for a total carat weight of 12.0 carats. Shop a wide range of diamond necklaces on 1stDibs.