14K BLACK OPAL COVERED MATHEY TISSOT WRISTWATCH: 14K yellow gold Mathey Tissot covered wristwatch with 7 round cabochon cut black crystal opals. Blue/Green play-of-color. The opals are prong set in the cover. Silver-tone dial with applied baton markers. Swiss jeweled movement. The watch is running. Triple strand rope bracelet with locking closure and figure eight safety clasp. Weight: 27.0 grams (with movement and crystal). 6 ''