This vintage 18K textured gold unisex ring is set with a cabochon cut silver black obsidian (natural volcanic glass). The obsidian is finely engraved with a coat of arms: a shield with a ramping lion beneath a princely crown.
The obsidian measures 15 x 12 mm (9/16 x 1/2 in.)
Weight 13.24 grams.
Width of the ring is 18 mm (2/3 in.)
Ring size  7.5 (18 mm) sizable