—Cosma Collection Clean forms showcasing the beauty of gold and diamonds. The Cosma Signet Ring is designed to emulate the diamonds shape in a solid octagon shape. Handcrafted in polished 18K gold. Engraving is available for this piece. Please make a note of desired engraving in the "Notes" box at checkout. ( 8 characters max ) Available in Yellow Gold, White Gold & Rose Gold — Platinum upon request. — Handcrafted in Los Angeles, California.