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Black Onyx Pendants

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Vintage Modernist Sterling Silver & Black Onyx Pendant - Mexico - 20th Century
Located in Chatham, CA
Vintage modernist large sterling silver and bezel set black onyx pendant - hinged loop - unsigned
Category

Late 20th Century Mexican Modernist Pendant Necklaces

Materials

Onyx, Sterling Silver

Carrera y Carrera Granada 18k Yellow Gold and Black Onyx Pendant, 10076404
By Carrera y Carrera
Located in North Miami Beach, FL
18K Yellow Gold and Black Onyx pendant. 18K Yellow Gold cable chain with lobster claw lock. The
Category

21st Century and Contemporary Pendant Necklaces

Materials

Yellow Gold

3.92 Carat Burma Natural Ruby & Black Onyx Pendant in 18k Solid Rose Gold
By GEM PLAZA
Located in Jaipur, Rajasthan
Magnificent Burma Ruby, Black onyx Pendant. Ruby: 3.92 carats Black onyx - 1.64 carat Rose Gold
Category

21st Century and Contemporary Indian Modernist Chain Necklaces

Materials

Onyx, Ruby, Gold, 18k Gold, Rose Gold

Round Cylindric Pillar Black Onyx Pendant (With Solid 14K Yellow Gold)
Located in Kowloon, HK
Drop and Dangle Obsidian Black Onyx cylindric stick tube Pendant with solid 14K Yellow Gold. A
Category

2010s Hong Kong Pendant Necklaces

Materials

Onyx, 14k Gold, Yellow Gold

18K White & Yellow Gold Diamond & Yellow Citrine & Black Onyx Pendant Necklace
Located in New York, NY
elegant addition to any outfit choice. A master of good fortune, a 22x16mm pear cut black onyx rests at
Category

21st Century and Contemporary Thai Contemporary Pendant Necklaces

Materials

Onyx, Citrine, White Diamond, Diamond, Yellow Gold, White Gold, 18k Gold

Art Deco Locket Rose Cut Diamond Platinum Pansy Flower Black Onyx Pendant
Located in New York, NY
an exquisite diamond set Pansy Flower on the carved Black Onyx and Platinum locket. The picture
Category

Early 20th Century Unknown Art Deco Pendant Necklaces

Materials

Diamond, Onyx, Platinum

18K White Gold Diamond Accent & Sky Blue Topaz & Black Onyx Pendant Necklace
Located in New York, NY
beauty. The centerpiece is an eye-catching 25x15mm pear cut black onyx in a 4-prong setting with a rich
Category

21st Century and Contemporary Thai Contemporary Pendant Necklaces

Materials

Blue Topaz, Topaz, Onyx, White Diamond, Diamond, White Gold, 18k Gold

14 Karat Gold Flaming Jet Black Onyx Pendant Earrings Suite
Located in New York, NY
14kt gold Jet Black Onyx Earrings Pendant Suite Earrings: 1.5 x .78inch Pendant: 1.4 x .76 inch
Category

2010s American Stud Earrings

Materials

Onyx, 14k Gold, Yellow Gold

Diamond Ruby Black-Onyx Gold Skull Pendant
Located in Beverly Hills, CA
framed in a smooth piece of black onyx. Pendant Length: 1.2 inches Chain Length: 18 inches
Category

21st Century and Contemporary American Pendant Necklaces

Materials

Diamond, Onyx, Ruby, Gold, 18k Gold, Rhodium

Art Deco Black Onyx Marcasite Necklace Sterling Silver Bow Motif Antique
Located in New York, NY
. THE PENDANT NECKLACE HAS A MAGNIFICENT ROUND BLACK ONYX PENDANT SET WITH A STERLING SILVER BOW MOTIF
Category

Early 20th Century Unknown Art Deco Pendant Necklaces

Materials

Marcasite, Onyx, Sterling Silver

"J.H.S." Huge Abstract Silver 925 with Black Onyx Pendant with Necklace
Located in New York, NY
Maker mark "J.H.S." huge abstract 925 Silver pendant centered with an oval onyx measures 3 1/2
Category

Vintage 1970s Mexican Baroque Necklace Enhancers

Modern Sacred 18k Rose Gold Talisman Pendant Necklace with Black Onyx
By REBECCA LI
Located in Valencia, CA
. Black Onyx means Protection & Luck. Pendant: Metal Type: 18K Rose Gold Gemstone: Black Onyx Pendant
Category

2010s American Contemporary Pendant Necklaces

Materials

Onyx, Gold, 18k Gold, Rose Gold

Antique Black Onyx Seed Pearl Gold Brooch Pendant
Located in Rotterdam, NL
An antique 19th century black onyx pendant created with pearls set in a gold floral decor. The oval
Category

Antique Late 19th Century Dutch Victorian Pendant Necklaces

Materials

Onyx, Pearl, Gold, 14k Gold, Yellow Gold

Syna Yellow Gold Swivel Pendant with Black Onyx Moon Quartz & Diamonds
By Syna Jewels
Located in Fort Lee, NJ
black onyx pendant captivates with its 4-carat and 4-carat stones, respectively, and 0.14 carats of
Category

2010s Unknown Contemporary Pendant Necklaces

Materials

Diamond, Onyx, Quartz, 18k Gold, Yellow Gold

NEW 18K Gold GIA Trillion Diamond Black Onyx Triangle Solitaire Pendant Necklace
Located in Montclair, NJ
claw clasp that ensures safe wear. A simply elegant and very classy diamond and black onyx pendant
Category

2010s American Pendant Necklaces

Materials

Diamond, Onyx, 18k Gold, White Gold

Art Deco 30 Carat Amethyst Onyx and Pearl Necklace
Located in Santa Barbara, CA
Gemstones: Cultured Pearls Buff Top Black Onyx Pendant Dimensions: 1 1/8" W x 1 1/8" H x 1/2" T Chain: 15 1
Category

Vintage 1920s Art Deco Pendant Necklaces

Materials

Amethyst, Onyx, Pearl, 18k Gold, White Gold

Ippolita 18K Yellow Gold Rock Candy Lollipop Black Onyx Necklace #16085
By Ippolita
Located in Washington Depot, CT
Ippolita 18K Yellow Gold Rock Candy Lollipop Black Onyx Necklace Black onyx pendant with 18 karat
Category

21st Century and Contemporary Chain Necklaces

Materials

Onyx, Yellow Gold, 18k Gold, Gold

Victorian Black Onyx 3.50 Carat Coral and Demantoid Garnet Yellow Gold Locket
Located in Jesmond, Newcastle Upon Tyne
panel which allows a personal memento or keepsake to be displayed. This black onyx pendant is suspended
Category

Antique 1890s Pendant Necklaces

Materials

Coral, Garnet, Onyx, Yellow Gold

Victorian Black Onyx 3.50 Carat Coral and Demantoid Garnet Yellow Gold Locket
Victorian Black Onyx 3.50 Carat Coral and Demantoid Garnet Yellow Gold Locket
Free Shipping
H 0.61 in W 1.57 in D 0.61 in Dm 1.57 in L 2.87 in
Platinum Black Onyx & Diamond Pendant
Located in Big Bend, WI
Platinum black onyx and diamond pendant with 14K white gold fancy Deco link chain. The center
Category

Antique Early 1900s Unknown Pendant Necklaces

Materials

Diamond, Onyx, 14k Gold, White Gold, Platinum

Modern Opal Black Onyx Diamond Platinum Pendant
Located in Beverly Hills, CA
. A carved smooth piece of black onyx has a 9.94 carat opal set on top of it creating a great contrast
Category

2010s Pendant Necklaces

Materials

Diamond, Onyx, Opal, Platinum

Black Onyx and Diamond Butterfly Pendant Necklace
Located in Miami, FL
diamond butterfly pendant necklace with black onyx wings. Features 14K yellow gold .42 carat total
Category

2010s North American Modern Pendant Necklaces

Materials

Diamond, Onyx, 14k Gold, Yellow Gold

Oval Black Onyx Filigree Pendant, Sterling Silver, Vintage
Located in McLeansville, NC
This stunning vintage black onyx filigree pendant is crafted from sterling silver and features an
Category

Vintage 1960s Pendant Necklaces

Materials

Onyx, Sterling Silver

Tiffany T Diamond and Black Onyx Circle Pendant
By Tiffany & Co.
Located in Bethesda, MD
yellow gold • Circa: 2020s • Gemstones: Black Onyx and Diamonds • Diamond: =.05ct • Chain Length: 16-18
Category

2010s Italian Pendant Necklaces

Materials

Diamond, Onyx, 18k Gold

24.34 Carat Emerald, Black Onyx and Diamond Pendant
By Royaal Stones Ltd
Located in Bangkok, Thailand
An art-deco inspired natural 24.34 carat vivid green Zambian Emerald, black onyx and Diamond link
Category

21st Century and Contemporary Art Deco Pendant Necklaces

Materials

Diamond, Emerald, Onyx, 18k Gold, Yellow Gold

Black-Onyx Diamond Gold and Rhodium Skull Pendant
Located in Beverly Hills, CA
A sleet diamond studded skull! It is set over a 47.50 carat piece of black onyx and is set with
Category

21st Century and Contemporary American Pendant Necklaces

Materials

Diamond, Onyx, Gold, 18k Gold, Rhodium

Black Onyx Diamond Meghna Jewels Claw Pendant Necklace
By Meghna Jewels
Located in Hoffman Estate, IL
this stunning Claw Pendant. Cast in 18K Gold and sterling silver. It is hand set in 10.03-carats black
Category

20th Century Modern Pendant Necklaces

Materials

Diamond, Onyx, 18k Gold, Sterling Silver

Sophia D. Black Onyx and Diamond Platinum Pendant
By Sophia D
Located in New York, NY
Sophia D's platinum set pendant with a pear shape center diamond weighing 1.05 carats accented by
Category

2010s American Art Deco Pendant Necklaces

Materials

Diamond, Onyx, Platinum

Diamond Onyx Pendant Necklace
Located in New York, NY
This exquisite diamond and onyx pendant is rendered in solid platinum. The pendant is shaped like a
Category

Mid-20th Century Pendant Necklaces

Materials

Diamond, Onyx, Platinum

Black Onyx Laughing Buddha Pendant (With 14K Yellow Gold)
Located in Kowloon, HK
The 'Cha'an Onyx Laughing Buddha Pendant' takes inspiration from the traditional laughing Buddha
Category

2010s Hong Kong Pendant Necklaces

Materials

Onyx, 14k Gold, Yellow Gold

Black Jade Pendant with Onyx and Diamonds Art Deco Style
Located in Southbury, CT
white diamonds, a 12mm ring of glossy black onyx, and then a second larger "D" shaped diamond encrusted
Category

Vintage 1980s Unknown Artisan Pendant Necklaces

Materials

Diamond, Jade, Onyx, Black Jade

Tiffany & Co Ziegfeld Black Onyx Pearl Bead Silver Daisy Pendant
By Tiffany & Co.
Located in London, GB
Step into timeless glamour with the Tiffany & Co. Ziegfeld Black Onyx Pearl Bead Silver Daisy
Category

2010s Pendant Necklaces

Materials

Onyx, Pearl, Silver

Antique, Large Onyx Gold Pendant, Enhancer with Black Enamel
Located in Berlin, DE
Antique, historical, large onyx gold pendant. The pendant can also be converted into a brooch
Category

Antique 19th Century Victorian Pendant Necklaces

Materials

Onyx, Gold, Enamel

Antique Portrait Enamel, Gold and Rose cut Diamond locket Pendant, c. 1860
Located in Aspen, CO
and is attached on a carved black onyx pendant. The verso has ornate initials in gold surrounded by a
Category

Antique 1860s American Neoclassical Pendant Necklaces

Materials

Diamond, Gold, 14k Gold, Enamel

14k Art Deco Black Onyx & Amethyst 13.82ctw Pendant
Located in Laguna Hills, CA
the center is an iced-quartz stone suspended by black onyx carved in an X shape. Diamonds are set in
Category

21st Century and Contemporary American Art Deco Pendant Necklaces

Materials

Amethyst, Diamond, Onyx, Ruby, 14k Gold, Yellow Gold

Black Onyx and Diamond Square Necklace/Pendant White Gold
Located in Miami, FL
Gold Metal Purity: 18k Stones: Diamonds, Black Onyx Total Carat Weight: 1.5 ct Total Item Weight (g
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Onyx, 18k Gold, White Gold

Syna Yellow Gold Black Onyx Illusion Pendant with Diamonds
By Syna Jewels
Located in Fort Lee, NJ
Created in 18 karat yellow gold Black onyx 65 carats approx. Diamonds 0.50 carat approx. Chain sold
Category

2010s Thai Contemporary Pendant Necklaces

Materials

Diamond, Onyx, 18k Gold, Yellow Gold

14 Karat Yellow Gold Black Onyx Tear Drop Pendant
Located in Scottsdale, AZ
Designer: custom Material: 14K yellow gold Dimensions: pendant measures 34 x 14mm Weight: 3.65
Category

21st Century and Contemporary Pendant Necklaces

Materials

Onyx, 14k Gold, Yellow Gold

Black Onyx Topaz Mother of Pearl Flower Pendant Necklace
By Meghna Jewels
Located in Hoffman Estate, IL
Cast from sterling silver. These stud earrings are hand set with 3.97 carats black onyx, .55 carats
Category

21st Century and Contemporary Unknown Modern Pendant Necklaces

Materials

Onyx, Topaz, Sterling Silver

10.22ct Black Onyx Circle Sterling Silver Spiga Chain Pendant Necklace
By Gems and Jewels UK
Located in Birmingham, GB
Black Onyx Circle Sterling Silver Pendant Necklace. Beautiful 10.22ct black onyx circle pendant
Category

21st Century and Contemporary Pendant Necklaces

Materials

Onyx, Silver, Sterling Silver

Carrera Y Carrera Ginkgo Black Onyx Yellow Gold Pendant Necklace
By Carrera y Carrera
Located in Holland, PA
18k Yellow Gold Black Onyx Ginkgo Pendant Necklace by Carrera Y Carrera. Details: Measurements
Category

21st Century and Contemporary Spanish Pendant Necklaces

Materials

Onyx, 18k Gold

14 Karat Yellow Gold Black Onyx Inlay Slider Pendant #13343
Located in Washington Depot, CT
Vintage 14 Karat Yellow Gold Black Onyx Inlay Slider Pendant- This lovely pendant features one
Category

20th Century Pendant Necklaces

Materials

Onyx, Yellow Gold

Diamond Black Onyx Marquise Meghna Jewels Claw Pendant Necklace
By Meghna Jewels
Located in Hoffman Estate, IL
This Claw necklace is cast in 14K gold & sterling silver. It is hand set in 7.54 carats black onyx
Category

21st Century and Contemporary Unknown Modern Pendant Necklaces

Materials

Onyx, Diamond, Sterling Silver, 14k Gold

Kowloon Black Onyx Dragon Pendant with 14K Yellow Solid Gold
Located in Kowloon, HK
The 'Kowloon Onyx Dragon Pendant' is a nostalgic jewel, representing Hong Kong's 'Nine Dragons
Category

2010s Hong Kong Pendant Necklaces

Materials

Onyx, 14k Gold, Yellow Gold, Gold

1.00 Carat Round Black Onyx & Diamond Yellow Gold Pendant Necklace
Located in Great Neck, NY
This Black Onyx & Diamond Pendant is a stunning and timeless accessory that can add a touch of
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Onyx, 14k Gold, Yellow Gold

1.00 Carat Round Black Onyx & Diamond White Gold Pendant Necklace
Located in Great Neck, NY
This Black Onyx & Diamond Pendant is a stunning and timeless accessory that can add a touch of
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Onyx, 14k Gold, White Gold

Syna Yellow Gold Mini Black Onyx Drop Pendant with Diamonds
By Syna Jewels
Located in Fort Lee, NJ
sold separately Handcrafted in 18 karat yellow gold, this pendant features black onyx of at least 10
Category

2010s Unknown Contemporary Pendant Necklaces

Materials

Onyx, Diamond, 18k Gold, Yellow Gold

VAN CLEEF & ARPELS Magic Alhambra Black Onyx Yellow Gold Pendant Necklace
By Van Cleef & Arpels
Located in New York, NY
lucky clover pendant crafted in 18k yellow gold and set with black onyx. The chain length is adjustable
Category

1990s Pendant Necklaces

Materials

Onyx, Yellow Gold

Square Onyx Pendant, Sterling Silver, Geometric Pendant, Mexican
Located in McLeansville, NC
This stunning square onyx pendant is made of sterling silver and measures 1.25 inches in size. Its
Category

Vintage 1970s Pendant Necklaces

Materials

Onyx, Sterling Silver

18 Karat White Gold Black Onyx and Diamond Tiger Pendant
Located in Scottsdale, AZ
Color: G / H Clarity: VS-SI1 Dimensions: pendant measures 60 x 53mm Weight: 32.27 grams
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Onyx, 18k Gold, White Gold

14K Yellow Gold Hollow Cross Pendant with Black Cabachon Onyx #15149
Located in Washington Depot, CT
14K Yellow Gold Hollow Cross Pendant with Black Cabachon Onyx This gorgeous hollow cross pendant
Category

20th Century Pendant Necklaces

Materials

Onyx, Gold, 14k Gold, Yellow Gold

Victorian Black Onyx Natural Pearl Diamond 18 Kt Locket Pendant
Located in Napoli, IT
Memories Keeper Superb Victorian period 1880 ca, large carved Onyx locket pendant with scroll open
Category

Late 20th Century European Victorian Pendant Necklaces

Materials

Diamond, Onyx, Natural Pearl, 18k Gold

Cartier White Black Caresse D'orchidees Flower Diamond Onyx Pendant Necklace
By Cartier
Located in San Diego, CA
Cartier Caresse d'Orchidees par Cartier Diamond & Onyx Pendant Necklace Style: Pendant Ref. number
Category

2010s French Pendant Necklaces

Materials

Diamond, Onyx, 18k Gold, White Gold

Vintage Georg Hornemann Carved Jadeite Jade Black Onyx Diamond Pendant Necklace
By Georg Hornemann
Located in Montclair, NJ
pierced and carved throughout and set at the center of a black onyx custom made frame that is further
Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Jade, Onyx, White Gold

Marlo Laz Black Diamond Black Onyx Opal 14K Rose Gold Evil Eye Pendant Necklace
By Marlo Laz
Located in New York, NY
evil eye with our own sculptural, ornate perspective and an ode to surrealism. Black onyx for
Category

2010s American Contemporary Pendant Necklaces

Materials

Black Diamond, Onyx, Opal, 14k Gold

Antique Black Onyx and Diamond Yellow Gold Cross Pendant, circa 1850
Located in Jesmond, Newcastle Upon Tyne
silver setting. The substantial body of the pendant has been crafted in black onyx, in the form of a
Category

Antique 1850s Unknown Pendant Necklaces

Materials

Diamond, Onyx, Gold, 18k Gold, Yellow Gold

Black and Grey Shaded Carved Jade Pendant with Diamond, Emerald and Black Onyx
By Artisan NYC
Located in New York, NY
One of a kind beautiful black and grey carved Jade pendant with round and baguette diamonds and
Category

21st Century and Contemporary Indian Artisan Pendant Necklaces

Materials

Diamond, Emerald, Jade, Onyx, 18k Gold, Silver

King Odysseus Pendant Necklace in 18Kt Rose Gold with Black Diamonds and Onyx
By Nicofilimon the Jewelry Designer
Located in Athens, GR
Smashing, One of a kind, 18Kt rose gold necklace - Pendant, round shape, with black diamonds & onyx
Category

2010s Greek Neoclassical Pendant Necklaces

Materials

Black Diamond, Onyx, Rose Gold, 18k Gold

Black Onyx Hardstone Yellow Gold EOS GREEK Goddess Carved Pendant Necklace
Located in Stamford, CT
Original 1890-1910 layered black and white onyx Cameo with an enamel outer rim. The Goddess of the
Category

Mid-20th Century Pendant Necklaces

Materials

Onyx, Gold, 14k Gold, Yellow Gold

Black Onyx Diamond and Pearl Gold and Platinum Pendant Art Deco
Located in Jesmond, Newcastle Upon Tyne
A stunning, fine and impressive antique black onyx, seed pearl and 0.13 carat diamond, platinum and
Category

Vintage 1930s Unknown Art Deco Pendant Necklaces

Materials

Diamond, Onyx, Pearl, Gold, 15k Gold, Platinum

Antique Art Deco 14k Yellow Gold Diamond & Black Onyx Filigree Pendant Necklace
Located in Montclair, NJ
gold and black onyx combined with the masterful Art Deco Workmanship is truly something special! Enjoy
Category

Vintage 1920s Art Deco Pendant Necklaces

Materials

Diamond, Onyx, Yellow Gold

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Black Onyx Pendants For Sale on 1stDibs

On 1stDibs, there are many options to choose from in our inventory of black onyx pendants. These distinct designs — crafted with great care and often made from Gold, 18k Gold and Yellow Gold — can elevate any look. Find a collection of 80 vintage versions or 74 modern creations for a more contemporary example of these cherished accessories. Our collection is diverse and broad-ranging, and pieces in stock date back to the 19th Century while others were produced as recently as the 21st Century. Pieces in our collection of black onyx pendants made by Art Deco jewelers — as well as those associated with Contemporary — are very popular. Versions of these items have been a part of the life’s work for many jewelers, but those produced by David Yurman, Van Cleef & Arpels and Cartier are consistently popular. Many pieces in our collection are stylish for most occasions, but Onyx versions, from our inventory of 117, can add a particularly distinctive touch to your look, day or night. A selection of round cut, mixed cut and pear cut can be found today on these pages. Most of our black onyx pendants for sale are for women, but there are 53 pieces available to browse for men.

How Much are Black Onyx Pendants?

Prices for black onyx pendants start at $134 and top out at $147,500 with these necklaces, on average, selling for $2,100.

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 Black Onyx Pendants
  • 1stDibs ExpertOctober 12, 2021
    The material of the ring setting is a driving factor in what a black onyx ring is worth. An onyx ring with a sterling silver ring setting can be purchased at under $30 as well. Black onyx is a semi-precious gemstone, with prices ranging from $1 to $500 per carat. Find a collection of vintage and designer black onyx rings on 1stDibs today.
  • 1stDibs ExpertApril 5, 2022
    One way to tell if your black onyx is real or not is to use a scratch test. Because black onyx clocks in at 6.5 to 7 on the Mohs scale of mineral hardness, it can’t be scratched by softer materials. Use a copper penny or a steel knife and scratch the surface of your stone. If the object leaves a scratch on the stone, it isn’t real black onyx. On 1stDibs, you’ll find a collection of genuine black onyx jewelry from some of the world’s top sellers.
  • A black onyx ring is a ring set with an onyx gemstone. Onyx is a semi-precious gemstone that typically comes in the color black.