A look at what is currently available on eBay
 BLACK ONYX SILVER RING UK SIZE Q, US 8 : 925294 US $3.16 
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 Black Onyx Ladies Ring Valentine US $4.99
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 Vintage 60's Pierre CARDIN 14K Gold Onyx Ring US $599.99
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Items recently purchased from this site
CARTIER PANTHERE Pave Diamond Emerald Onyx Gold Ring, CARTIER Rare 18k Gold Diamond Onyx Panthere Dome Ring sz.5, ESTATE ART DECO 1.63 ct OVAL OLD MINE CUT DIAMOND 2ct RUBY ONYX PLATINUM RING, ART DECO 2ctw YELLOW DIAMOND EMERALD ONYX PLATINUM RING, DECO 1.36ctw EURO DIAMOND EMERALD ONYX CUSHION RING, ANTIQUE STYLE 1.70ctw DIAMOND EMERALD ONYX CUSHION RING, ESTATE ART DECO 1.57ct EUROPEAN CUT CENTER DIAMOND EMERALD ONYX PLATINUM RING, ART DECO PLATINUM, EMERALD DIAMONDS & ONYX BYPASS RING, Estate Platinum Art Deco Emerald, Onyx & Diamond Ring , *WOW * ESTATE 1.51 TOTAL DIAMOND WEIGHT DIAMOND & BLACK ONYX PLANTINUM RING**, DRAMATIC ESTATE CUSTOM HEAVY 14K DIAMOND AND ONYX RING, 18K Dome Style Ring With White Onyx And Diamonds 5.50CT, NEW GURHAN 24K GOLD MICRO MOSAIC ONYX DIAMOND RING $14800, Estate Platinum Yellow Gold Emerald Onyx Art Deco Ring, MUST SEE UNIQUE ANTIQUE ART DECO 1.05CT DIAMOND PLATINUM & ONYX ENGAGEMENT RING!, 3 Ladies Designer TRISKO 14K Yellow Gold Diamond Onyx Rings, FANCY DOME RING! BLACK & WHITE ONYX & DIAMONDS 18K , ESTATE X LARGE DIAMOND ONYX CORAL 18KT WHITE GOLD BYPASS COCKTAIL RING #BRR66220, ART DECO 8 SIDED DOMED TOP CALIBRE ONYX .70CT G, VS1 EURO DIAMOND PLATINUM RING, ART DECO CALIBRE BLACK ONYX PLATINUM .70CT H, VS2 OLD EUROPEAN CUT DIAMOND RING, Italian Retro Classic Diamond, Ruby, Sapphire, Emerald & Onyx Inlay Ring 750/18k, $14188 1.84CT PANTHER DESIGN COGNAC DIAMOND,TSAVORITE & WHITE ONYX RING 18K , Estate Platinum Diamond Onyx Art Deco Ring, ASCH GROSSBARDT 14KT GOLD DIAMOND OPAL ONYX INLAID EARRINGS RING SET, BULGARI BVLGARI 18k PINK GOLD SERPENTI ONYX PAVE DIAMOND RING, Roman Chariot Intaglio Onyx Diamond Mens Ring 14K Gold, VAN CLEEF & ARPELS VCA 18K GOLD DIAMOND BLACK ONYX RING, BEBE TUNG 18K750 White Gold Diamond Onyx Ring!, Vintage Diamond, Emerald, Black Onyx & 18k White Gold Engagement Ring-J32851, Estate Platinum Diamond Emerald Onyx Square Ring, 18K LARGE BLACK ONYX & DIAMOND DOME RING MAKE OFFER, ANTIQUE ART DECO .84ct DIAMOND ONYX TABLE RING 1930 , FABULOUS 18 CARAT GOLD TURQUOISE DIAMOND ONYX RING DIAMOND PANTHER NECKLACE, Platinum Men's Black Onyx Ring, Henry Dunay Vintage Estate 18K Yellow Gold Diamond Black Onyx Ring Size 10 , PLATINUM FANCY INTENSE YELLOW DIAMOND IN ONYX PAVE DIAMOND RING, Pre-Owned David Yurman 18K White Gold Noblesse Ring with Diamonds and Black Onyx, HEAVY DUTY 18 K GOLD HARLEY DAVIDSON RING WITH ONYX AND DIAMONDS, █$9000 1.23CT CARVED ONYX & DIAMOND PLATINUM RING █CRESCENT DECO PRIME, 1.75CT Men's Round Brilliant Cut Diamond Pinkie Ring with Onyx14kt White Gold, 14KT Y/G Flat Onyx and Pave' Diamond 0.35ct Ring 12.1gr, C. 1920 PLATINUM FINE WORK ART DECO PLATINUM DIAMOND ONYX RING ENGAGEMENT BAND, Diamond and Carved Black Onyx Ring, GENUINE VICTORIAN 2.90 CT ROSE CUT DIAMOND BLACK ONYX RARE RING - FREE EU P&P!, 14KT Y/G Flat Onyx Channel Set Diamonds 0l.25ct Ring, Designer 18k White Gold Onyx And Diamonds Lizard Ring, Vintage 18K White Gold Onyx and 1CTW Diamond Ring, ELAN LADY'S 18k YELLOW GOLD DIAMOND AND BLACK ONYX RING, 18K WHITE GOLD DIMODOLO BRIGHT GREEN ONYX DIAMOND RING, ELEGANT VINTAGE 18K YELLOW GOLD & 12 DIAMONDS EUROPEAN ONYX SET: RING & BANGLE., ESTATE 18K GOLD ONYX 2.25ct DIAMOND RING, KWIAT VINTAGE COLLECTION #28007B $6350.00 DIAMOND & ONYX RING - SPECTACULAR, ART DECO DIAMOND QUARTZ & ONYX DOME RING NO RESERVE!, ANTIQUE ART DECO STYLE 0.75CT OLD MINE CUT DIAMOND ONYX ENGAGEMENT RING PLATINUM, LARGE ESTATE DIAMOND BLACK ONYX MENS 18KT YELLOW GOLD RING 12MM E/F VVS #16347, 18ct Art Deco Diamond, Emerald, Coral & Onyx Ring M 038, SO CHIC! BUNZ 18K YELLOW GOLD and ONYX .65 CARAT DIAMOND BAND RING, LARGE ESTATE 14K PINK ROSE GOLD DIAMOND BLACK BLACK ONYX ROUND FLOWER RING R1161, 1940's RETRO DECO NATURAL CABOCHON PERSIAN TURQUOISE ONYX DIAMOND PLATINUM RING, Ring 14ky gold 4 diamonds .5 ct black onyx size 9 3/4 Free shipping, BULGARI PYRAMID RING 18KT WHITE GOLD, DIAMOND, BLACK ONYX STONE BVLGARI Size 6, Vintage Platinum Diamond Black Onyx Filigree Ladys Ring, Retail $5,100.00-"B&H" Vintage Diamond,Multi Gems w/Onyx 14K Gold Ring-Size9.5, RARE! AUTHENTIC CARTIER 18K YELLOW GOLD MOTHER OF PEARL BLACK ONYX RING SIZE 7, David Yurman Large Black Onyx 18K Gold cable chain pave diamond RING 6, CHIC Nardi 18k Gold Amethyst, Onyx, & Coral Ring Set, ANTIQUE ONYX Y GOLD VICTORIAN SUITE NECK,BROO,ER,RING, ESTATE LARGE SOLID DIAMOND BLACK ONYX 14KT 2 TONE GOLD FILIGREE MENS RING #20247, VINTAGE TIFFANY & CO 18K GOLD ONYX DIAMOND RING, NEW BVLGARI 18 CT WHITE GOLD AND ONYX BULGARI ROTATING RING AN851998 54mm US-6, BVLGARI 18 CT WHITE GOLD AND ONYX BULGARI ROTATING RING AN851998 53mm / 6 / M½, NEW BVLGARI 18 CT WHITE GOLD AND ONYX BULGARI ROTATING RING AN851998 55mm US-7, Roberto Coin Panda Onyx Diamond Cocktail Ring 18K Gold, Kabana #WRIF264OXMW 14kt White Gold Inlaid White MOP with Onyx and Diamond Ring, Neda Behnam 18K Onyx Garnet and Diamond Tiger Ring, EYE-CATCHING 18K GOLD, DIAMONDS & ONYX LADIES RING, Rare Antique Vintage Onyx Emerald Diamond Ring PLT, Estate Vintage 18K Gold 1.75 CT Diamond Pave Onyx Halo Oval Cocktail Ring Heavy, RARE! AUTHENTIC VINTAGE TIFFANY & CO 18K YELLOW GOLD CORAL ONYX REVERSIBLE RING, NEW 2.15ctw Micro Pave Diamond Show Off Ring 18K White Gold Black Onyx, 14K Yellow Gold Mens Diamond & Onyx Ring Size 10, DON'T MISS THIS GORGEOUS ESTATE RING OF BLACK ONYX & PAVE DIAMONDS 14K, Asprey 18K White Gold Micro Pave Diamond Onyx Ring, Opal Cameo Onyx Diamond 14K Yellow Gold Ring, Judith Ripka 18K Yellow Gold Large Black Onyx Glacier Diamond Ring NEW Size 6, 1900 PLATINUM BEZEL RAISED OVAL ONYX 1.00CT BEADED DIAMOND 14K YELLOW GOLD RING, 14KT Y/G Round Flat Onyx Ring 11.6gr, Estate 18kt YG Black Onyx & Diamonds Ring with Blue Topaz 10.00ct. Circa 1960’s, David Yurman Unique Carved Onyx and Diamond 18kt Yellow Gold Ring, Holzel German Bronze Onyx Figurine of girl ring Holder, B.T Micro Craft 18K750 Yellow Gold Onyx Diamonds Ring,