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21 Carat Diamond Necklace

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18K Rose Gold 21 Carat Diamond Link Chain Necklace
Located in New York, NY
18K Rose Gold 21 Carat Diamond Link Chain Necklace. Crafted out of 18K rose gold, every paperclip
Category

20th Century American Modern Chain Necklaces

Materials

Diamond, 18k Gold, Rose Gold

18K Yellow Gold 21 Carat Diamond Link Chain Necklace
Located in New York, NY
18K Yellow Gold 21 Carat Diamond Link Chain Necklace. Crafted out of 18K rose gold, every paperclip
Category

20th Century American Modern Chain Necklaces

Materials

Diamond, 18k Gold, Yellow Gold

21 Carat Tennis Necklace in with 3-Prong Set Round Diamonds
By Antinori Fine Jewels
Located in Rome, IT
This stunning and impressive Riviera Necklace features substantial Diamond weight of 21 Carats in
Category

2010s Italian Modern Link Necklaces

Materials

Diamond, White Diamond, 18k Gold, White Gold

21 Carat Cushion-Cut AAA Tanzanite & 9.5 Ct Diamonds, Pendant Necklace Estate
Located in New York, NY
This extraordinary, 21 carat tanzanite is truly an extraordinary gemstone. There are total of
Category

Early 2000s Drop Necklaces

Materials

Diamond, Tanzanite, 14k Gold

Natural Yellow Round and White Diamond .21 Carat TW Gold Necklace
Located in New York, NY
RareGemWorld's classic diamond necklace. Mounted in a beautiful 14K Yellow and White Gold setting
Category

21st Century and Contemporary American Contemporary Drop Necklaces

Materials

Diamond, White Diamond, Yellow Diamond, Gold, 14k Gold, White Gold, Yell...

2.00 Carats Drop Pear Shape Diamonds and Ruby Necklace 18k Solid White Gold 21"
Located in Great Neck, NY
18k solid white gold drop pear shape diamonds and ruby necklace, Double link 18k ltalian chain With
Category

2010s Drop Necklaces

Materials

Diamond, White Gold

2.00 Carats Drop Pear Shape Diamonds and Ruby Necklace 18k Solid White Gold 21"
Located in Great Neck, NY
18k solid white gold drop pear shape diamonds and ruby necklace, Double link 18k ltalian chain With
Category

2010s Drop Necklaces

Materials

Diamond, Ruby, White Gold

7.05 Carat Natural Diamond Necklace 14 Karat White Gold G-H SI 21 Grams
Located in New York, NY
7.05 Carat Natural Diamond Necklace 14K White Gold G SI 16 inches 100% Natural Diamonds, Not
Category

21st Century and Contemporary American Contemporary Chain Necklaces

Materials

Diamond, 14k Gold, White Gold

21 Carats + Fancy Shape Diamond By the Yard Necklace in Platinum 36 inches
Located in La Jolla, CA
21 carats Fancy Shape Diamonds Diamond By the Yard Necklace in Platinum Platinum diamond by the
Category

21st Century and Contemporary North American Chain Necklaces

Materials

Diamond, Platinum

21 Carats Pink Sapphire Tennis Necklace 14 Karat White Gold 20''
Located in Great Neck, NY
21 CARATS NATURAL PINK SAPPHIRE TENNIS NECKLACE WHITE GOLD 14K 20 INCH. 3.2MM WIDE. All sapphire
Category

2010s American More Necklaces

Materials

Pink Sapphire, Diamond, 14k Gold, White Gold

Tanzanite Cabochon Pendant 21 Carats Diamonds 18 Karat
Located in North Hollywood, CA
Carats with a Diamond Border of .50 Carats of Diamonds. This pendant is high domed just like the matching
Category

2010s American Modern Pendant Necklaces

Materials

White Diamond, Tanzanite, 18k Gold

19.34 Ct Vivid Blue Oval Cut Sapphire and 5.65 Ct Diamond Necklace in 18W ref71
By Diamond Town
Located in New York, NY
This necklace features 21 oval cut vivid blue sapphires in a graduated pattern, each in a halo of
Category

21st Century and Contemporary Contemporary Link Necklaces

Materials

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

.91 Carat Diamond White Gold Pendant Necklace
Located in Stamford, CT
Four trilliant diamond clustered pendant necklace. Center diamonds surrounded with a halo of round
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Gold, 14k Gold, White 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

.925 Sterling Silver 4.0 Carat Diamond Cross Pendant Necklace
Located in New York, NY
of belief, this beautiful piece is composed of 21 natural round-cut diamonds in a prong setting
Category

21st Century and Contemporary Indian Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, Sterling Silver

.925 Sterling Silver 4.0 Carat Diamond Cross Pendant Necklace
.925 Sterling Silver 4.0 Carat Diamond Cross Pendant Necklace
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H 0.12 in W 1.42 in L 2.21 in
0.51 Carat Diamond/1.05 Carat Ruby 18 Karat Gold Hearts Pendant Necklace
By Sebastian Bernard
Located in Los Angeles, CA
18K Gold Heart shaped Pendant with 21 Invisible Set Princess Cut Rubies (Total Gem Weight 1.05 Ct
Category

2010s American Contemporary Pendant Necklaces

Materials

Ruby, Diamond, 18k Gold

71.00 Carat Sapphire, 10.00 Carat Natural Diamonds, Statement Necklace
Located in Ramat Gan, IL
gorgeous collier includes 71.00 carat lab corundum sapphire and 6.00 carat natural diamonds. Sapphire
Category

2010s Israeli Art Deco Choker Necklaces

Materials

Diamond, Sapphire, 14k Gold, 18k Gold

Seidengang .35 Carat Diamond Yellow Gold Three Flower Necklace
By SeidenGang
Located in Stamford, CT
Authentic Seidengang triple diamond flower 18k yellow gold necklace. 21 round brilliant cut
Category

21st Century and Contemporary Chain Necklaces

Materials

Diamond, Gold, 18k Gold, Yellow Gold

0.18 Carat Diamond/0.80 Carat Blue Sapphire 18K Gold Hearts Pendant Necklace
By Sebastian Bernard
Located in Los Angeles, CA
. Total Diamond Weight: 0.18 Ct Total Gem Weight: 0.80 Ct Total Necklace Weight: 4.4 gr Pendant Size
Category

2010s American Contemporary Pendant Necklaces

Materials

Diamond, Blue Sapphire, 18k Gold

18 Carat White Gold Diamond Tennis Necklace
Located in Cape Town, ZA
: 415mm Width: 0.5mm Weight: 21.g Stone Attributes Stones: Diamond Number: 78
Category

21st Century and Contemporary Link Necklaces

Materials

Diamond, White Gold

0.51 Carat Diamond/1.47 Carat Blue Sapphire 18K Gold Hearts Pendant Necklace
By Sebastian Bernard
Located in Los Angeles, CA
18K Gold Heart shaped Pendant with 21 Invisible Set Princess Cut Blue Sapphires (Total Gem Weight
Category

2010s American Contemporary Pendant Necklaces

Materials

Diamond, Blue Sapphire, 18k Gold

0.24 Carat Diamond/0.75 Carat Blue Sapphire 18K Gold Hearts Pendant Necklace
By Sebastian Bernard
Located in Los Angeles, CA
18K Gold Heart shaped Pendant with 21 Invisible Set Princess Cut Blue Sapphires (Total Gem Weight
Category

2010s American Contemporary Pendant Necklaces

Materials

Diamond, Blue Sapphire, 18k Gold

1.36 Carat Diamond White Gold Rectangular Modern Pendant Necklace
Located in Stamford, CT
Diamond pendant necklace. This rectangle shaped setting has three rows for 21 straight baguette
Category

Late 20th Century Pendant Necklaces

Materials

Diamond, Gold, 14k Gold, White Gold

Peter Suchy GIA Certified .79 Carat Diamond Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Pear shape diamond pendant necklace. GIA certified colorless F pear shape diamond, set in a 14k
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Gold, 14k Gold, White Gold

6.50 Carat Aquamarine Diamond Platinum Kite Shaped Pendant Necklace
Located in Stamford, CT
Aquamarine and diamond pendant necklace. Kite shape aqua center dangle with round and emerald cut
Category

Late 20th Century Modern Chain Necklaces

Materials

Aquamarine, Diamond, Platinum

Color Diamonds 22-21 Karat Gold Handmade Pendant on Leather Choker Necklace
By AB Jewelry NYC
Located in New York, NY
diamonds. The voluptuous pendant shape and luxurious color of high carat gold make a dramatic stylish
Category

21st Century and Contemporary American Contemporary Pendant Necklaces

Materials

Diamond, Blue Diamond, Brown Diamond, Gold, Yellow Gold, 22k Gold

Golden South Seas Pearl Necklace with Diamond and Gold Accents, 21 Inches
By Sarosi By Timeless Gems
Located in Los Angeles, CA
this luxurious necklace that will turn heads wherever you go! Finished length 21 inches Round
Category

21st Century and Contemporary Artisan Beaded Necklaces

Materials

Diamond, White Diamond, South Sea Pearl, Cultured Pearl, Gold, 14k Gold,...

Vintage 4 Carat Tension Set Colombian Emerald & Diamond Chocker Necklace
Located in Miami, FL
Natural emerald and diamond choker necklace in 18k gold. Fixed with a textured polished finish
Category

1990s Colombian Modernist Choker Necklaces

Materials

Diamond, Emerald, 18k Gold

Victorian 3.06 Carat Garnet and Diamond Yellow Gold Snake Necklace
Located in Jesmond, Newcastle Upon Tyne
A stunning, fine and impressive antique Victorian 3.06 carat garnet and 0.13 carat diamond, 21
Category

Antique 1890s Victorian Pendant Necklaces

Materials

Diamond, Garnet, Yellow Gold

2.53 Carat Natural Diamond Necklace 14 Karat White Gold
Located in New York, NY
100% Natural Diamonds, Not Enhanced in any way Round Cut Diamond Necklace 2.53CT G-H SI 14K
Category

21st Century and Contemporary American Contemporary Drop Necklaces

Materials

Diamond, 14k Gold, White Gold

10K Rose Gold 1/2 Carat Diamond Heart Pendant Necklace
Located in New York, NY
A gold and diamond heart shaped pendant. This necklace is made with 31 round and 21 baguette cut
Category

21st Century and Contemporary Indian Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, 10k Gold, Rose Gold

10K Rose Gold 1/2 Carat Diamond Heart Pendant Necklace
10K Rose Gold 1/2 Carat Diamond Heart Pendant Necklace
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H 0.52 in W 0.12 in L 0.56 in
Peter Suchy .28 Carat Diamond White Gold Halo Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Diamond pendant necklace. .21ct center diamond with a halo of 21 round brilliant cut diamonds, in a
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, White Gold, Gold, 14k Gold

27 Carat Combined Mix Shape Diamond Necklace Certified
Located in New York, NY
Looking for a luxurious and elegant diamond necklace for that special person in your life? Look no
Category

2010s American Beaded Necklaces

Materials

Diamond, 14k Gold, White Gold

17.6 Carat Emerald 6.3 Carat Diamond Pendant Necklace Antique Estate Gold
Located in New York, NY
Diamond necklace. The necklace is set with 21 Oval and Pear Cut Fine Green Emeralds. The gorgeous vivid
Category

20th Century Unknown Contemporary Pendant Necklaces

Materials

Diamond, Emerald, Gold, 14k Gold, White Gold

300 Carat 5-Strand Emerald Necklace with 4.8 Carat Diamond & Enamel in 14k Gold
Located in New York, NY
Approximately 300 Carat very fine Emerald Beads 5 Line Necklace With 14 Karat Yellow Gold Clasp
Category

2010s Beaded Necklaces

Materials

Emerald, Diamond, 14k Gold, Yellow Gold, Enamel

21 Carat Square Emerald Bluish Violet & Diamond Fashion Pendants In 18K WG
Located in Chicago, IL
bluish violet tanzanite weighing 21.00 carats and a single oval-cut diamond weighing 0.52 carats as a
Category

2010s Pendant Necklaces

Materials

Diamond, Emerald, White Gold, 18k Gold

1.38 Carat Three-Row Chain 21 Fullcut Diamonds Amazing Decorative Italian Style
Located in Viena, Viena
work, design that convinces!, here we have worked a modern three-row diamond necklace in 750 yellow
Category

2010s Italian Modern Pendant Necklaces

Materials

Diamond, 18k Gold, Yellow Gold

0.25 Carat Diamond & Tsavorite Circle Pendant Necklace 14K White Gold
Located in New York, NY
0.25 Carat Natural Diamond & Tsavorite Circle Pendant Necklace 14K White Gold 100% Natural
Category

21st Century and Contemporary American Contemporary Chain Necklaces

Materials

Tsavorite, Diamond, 14k Gold, White Gold

0.25 Carat Diamond & Sapphire Circle Pendant Necklace 14K White Gold
Located in New York, NY
0.25 Carat Natural Diamond & Sapphire Circle Pendant Necklace 14K White Gold 100% Natural Diamonds
Category

21st Century and Contemporary American Contemporary Chain Necklaces

Materials

Diamond, Sapphire, White Gold, 14k Gold

0.29 Carat diamond 18K Gold Om Lotus Hindu Pendant Necklace
By Oshi Jewels
Located in Bangkok, TH
Handcrafted OM diamond necklace is a perfect everyday wear necklace to bring inner peace and
Category

21st Century and Contemporary Thai Modern Pendant Necklaces

Materials

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

0.29 Carat diamond 14K Gold Om Lotus Hindu Pendant Necklace
By Oshi Jewels
Located in Bangkok, TH
Handcrafted OM diamond necklace is a perfect everyday wear necklace to bring inner peace and
Category

21st Century and Contemporary Thai Modern Pendant Necklaces

Materials

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

18 Karat White Gold Bow-Tie Diamond Necklace '1/5 Carat'
Located in San Francisco, CA
This elegant necklace features round brilliant diamonds micro-prong set in a bow-tie shape
Category

21st Century and Contemporary American Pendant Necklaces

Materials

Diamond, White Gold

18 Karat Yellow Gold Bow-Tie Diamond Necklace '1/5 Carat'
Located in San Francisco, CA
This elegant necklace features round brilliant diamonds micro-prong set in a bow-tie shape
Category

21st Century and Contemporary American Pendant Necklaces

Materials

Diamond, Yellow Gold

18 Karat Rose Gold Bow-Tie Diamond Necklace '1/5 Carat'
Located in San Francisco, CA
This elegant necklace features round brilliant diamonds micro-prong set in a bow-tie shape
Category

21st Century and Contemporary American Pendant Necklaces

Materials

Diamond, Rose Gold

.71 Carat Total Diamond and Diamond Halo Necklace in Platinum, 17 Inches
By Sarosi By Timeless Gems
Located in Los Angeles, CA
with a halo of 21 round brilliant cut diamonds for even more sparkle! This necklace was handmade by our
Category

21st Century and Contemporary American Artisan Chain Necklaces

Materials

Diamond, White Diamond, Platinum

Ruby, Emerald, Diamond 61.00 Carat One of a Kind Necklace 18K
By Emeralds Maravellous
Located in US
% Natural Colombian Emerald Shape or Cut Emeralds: Mix-Cut Total Emerald Weight: Over 21 Carats (108
Category

21st Century and Contemporary American Contemporary Choker Necklaces

Materials

Diamond, Emerald, Ruby, 18k Gold, Yellow Gold

6.42 Carat Floating Emerald with Diamond & Emeralds in 18K Pendant Necklace
By Gad & Co.
Located in Miami, FL
weighing 0.21 carats, and 80 round-cut white diamonds weighing 1 carat total. The chain of the necklace
Category

21st Century and Contemporary North American Baroque Pendant Necklaces

Materials

Diamond, Emerald, Gold, 18k 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

9.00 Carat Aqua Ruby Diamond Rose Gold Pendant
Located in Stamford, CT
Retro Art Deco Aqua, diamond and ruby pendant. 9.00ct oval natural aqua set in 14k rose gold
Category

Early 20th Century Necklace Enhancers

Materials

Aquamarine, Diamond, Ruby, Rose Gold, Gold, 14k Gold

14k Gold 0.14 Carat Diamond Minimalist Evil Eye Protection Necklace
By Oshi Jewels
Located in Bangkok, TH
cut diamonds. This necklace is designed to protect the wearer from the negativity and evil around
Category

21st Century and Contemporary Thai Egyptian Revival Pendant Necklaces

Materials

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

18K Gold 0.14 Carat Diamond Minimalist Evil Eye Protection Necklace
By Oshi Jewels
Located in Bangkok, TH
cut diamonds. This necklace is designed to protect the wearer from the negativity and evil around
Category

21st Century and Contemporary Thai Egyptian Revival Pendant Necklaces

Materials

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

Yellow Gold Diamond Oval Stripe Necklace 21 3/4" - 18k Rnd 1.10ctw Animal Print
Located in Greensboro, NC
Metal Content: 18k Yellow Gold & 18k White Gold Stone Information Natural Diamonds Carat(s
Category

21st Century and Contemporary Chain Necklaces

Materials

Diamond, 18k Gold, Yellow 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

0.15 Carat Diamonds Cross Necklace in 14K White Gold
Located in New York, NY
Diamond Carat Weight: This elegant cross necklace features a total of 0.15 carats of diamonds
Category

21st Century and Contemporary Hong Kong Modern Chain Necklaces

Materials

Diamond, 14k Gold, White Gold

0.1 Carat Diamonds Cross Necklace in 18K Yellow Gold
Located in New York, NY
Diamond Carat Weight: This elegant cross necklace features a total of 0.1 carats of diamonds
Category

21st Century and Contemporary Hong Kong Modern Chain Necklaces

Materials

Diamond, 14k Gold, Yellow Gold

0.1 Carat Diamonds Cross Necklace in 14K Yellow Gold
Located in New York, NY
Diamond Carat Weight: This elegant cross necklace features a total of 0.1 carats of diamonds
Category

21st Century and Contemporary Hong Kong Modern Chain Necklaces

Materials

Diamond, Yellow Gold, 14k Gold

0.1 Carat Diamonds Cross Necklace in 14K White Gold
Located in New York, NY
Diamond Carat Weight: This elegant cross necklace features a total of 0.1 carats of diamonds
Category

21st Century and Contemporary Hong Kong Modern Chain Necklaces

Materials

Diamond, 14k Gold, White Gold

White Gold 21, 56ct Morganite & Diamond Pendant
By Thomas Leyser
Located in Idar-Oberstein, DE
and diamonds. This pendant in 18k white gold is set with a fine Morganite (facetted, loup-clean
Category

21st Century and Contemporary German Contemporary Pendant Necklaces

Materials

Diamond, Morganite, White Gold, 18k Gold

White Gold 21, 56ct Morganite & Diamond Pendant
White Gold 21, 56ct Morganite & Diamond Pendant
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W 0.71 in D 0.4 in L 1.58 in
NYC 18 Karat Yellow Gold 11.84 Carat Diamond and 3.15 Carat, Ruby Necklace
By Cellini
Located in New York, NY
. Total length 21". Diamond weight 11.84 carats Five marquis rubies 3.15 carats
Category

Vintage 1980s Italian Retro Drop Necklaces

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

0.25 Carat Diamond & Pink Sapphire Circle Pendant Necklace 14K White Gold
Located in New York, NY
0.25 Carat Natural Diamond & Pink Sapphire Circle Pendant Necklace 14K White Gold 100% Natural
Category

21st Century and Contemporary American Contemporary Chain Necklaces

Materials

Diamond, Pink Sapphire, 14k Gold, White Gold

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21 Carat Diamond Necklace For Sale on 1stDibs

Surely you’ll find the exact 21 carat diamond necklace you’re seeking on 1stDibs — we’ve got a vast assortment for sale. Frequently made of Gold, White Gold and 18k Gold, this item was constructed with great care. You can easily find a 54 antique edition and 8223 modern creations to choose from as well. Making the right choice when shopping for a 21 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 18th Century and a newer version made as recently as the 21st Century, both of which have proven very popular over the years. As it relates to this specific piece, our collection includes designs that are universally popular, but .5 Carat and 1 Carat carat weights, specifically, are sought with frequency. Finding an appealing 21 carat diamond necklace — no matter the origin — is easy, but LB Exclusive, Oshi Jewels and Roman Malakov each produced a popular version that is worth a look. See these pages for a round cut iteration of this accessory, while there are also oval cut cut and pear cut cut versions available here, too. Most of our 21 carat diamond necklace for sale are for women, but there are 1940 pieces available to browse for men.

How Much is a 21 Carat Diamond Necklace?

The price for a 21 carat diamond necklace starts at $1 and tops out at $3,600,000 with these necklaces, on average, selling for $3,186.

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 21 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.