Gübelin Ring 750 Yellow Gold Lapis Lazuli 

Inlaid with a lapis lazuli plaque and with carved figural gold frame in a mask motif and set with onyx cabochons, with a squared U shaped shank, stamped Exclusive / Gübelin / 750.
24.45 x 26.48 mm; Ring size 8.5 on mandrel; 13.5 grams, Hallmark
Very good condition