Spider Web Turquoise Shadowbox Pendant in Sterling SIlver

Navajo sterling silver Shadowbox pendant on chain necklace. The pendant is set with a very fine spider web turquoise stone. Stone is pear-shaped and measures 17mm by 15mm. The pendant measures 1 3/4" long by 1". Sterling ball chain is 16" long and has a lobster claw clasp. Chain is marked sterling, The pendant is hallmarked. Acid tested. Has tarnish and old silver polis inside.