Because Great Jewelry Is Art. Shop this modern geometric bold chain necklace by David Webb. Crafted in 18K Yellow gold, featuring an octagonal onyx as a focal center piece suspended from an open link flat rectangular chain. 18 inches long. Diamonds. Center Diamond Weight: 0.00 Metal Type: Platinum & 18K Yellow Gold Metal Weight: 95.3 gr. Signed: WEBB Condition: Excellent. Stock: RR7415