A look at what is currently available on eBay
 7mm BRILLIANT ROUND NATURAL COGNAC QUARTZ #R502 US $3.15 
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 COGNAC QUARTZ FACETED HEART CONCAVE CUT BEADS 9 MM E20 US $9.98
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 Barbara Bixby cognac quartz ring (7) US $159.00
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Items recently purchased from this site
6.01 Ct Oval Envy Green Mystic Quartz and Cognac Red Diamond 18k White Gold Ring, 5.21 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k White Gold Ring, 5.21 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k Yellow Gold Ring, 6.18 Ct Oval Envy Green Mystic Quartz and Cognac Red Diamond 18k White Gold Ring, 5.38 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k White Gold Ring, 5.38 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k Yellow Gold Ring, 6.01 Ct Oval Envy Green Mystic Quartz and Cognac Red Diamond 14k White Gold Ring, 5.21 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 14k Yellow Gold Ring, 5.21 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 14k White Gold Ring, KRYPELL SILVER 14K GOLD COGNAC QUARTZ DIAMOND EARRINGS, JOHN HARDY Batu Sari Cognac Quartz & Diamond Earrings, JOHN HARDY 18K STERLING COGNAC QUARTZ DIAMOND ENHANCER, 6.18 Ct Oval Envy Green Mystic Quartz and Cognac Red Diamond 14k White Gold Ring, 5.38 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 14k White Gold Ring, 5.38 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 14k Yellow Gold Ring, JOHN HARDY LARGE SS/18K GOLD DIAMOND COGNAC QUARTZ RING BATU SARI $1795, 2.32 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k Yellow Gold Ring, 2.32 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k White Gold Ring, 2.32 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k Rose Gold Ring, JOHN HARDY BATU SARI COGNAC QUARTZ GOLD & SILVER BRACLET NEW, KRYPELL STERLING 14K GOLD COGNAC QUARTZ BRACELET $2270, 5.21 Ct Ruby Red Oval Mystic Quartz and Cognac Red Diamond 18k White Gold Ring, 4.19 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k White Gold Ring, 4.19 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 18k Rose Gold Ring, CHARLES KRYPELL DIAMOND COGNAC QUARTZ EARINGS 14K / SS, 2.32 Ct Oval Ruby Red Mystic Quartz and Cognac Red Diamond 14k Yellow Gold Ring,