Edwardian 18k Gold Blue Sardonyx Signet Ring tiffany & co This brooch features two faceted

This brooch features two faceted gems making up the abdomen and cephalothorax of a spider

Crafted in yellow metal (I'd say brass based on the weight) with green leather cover and jump ring for wear as a pendant/charm

It is mentioned in The Romance of Princess Amelia

The process is credited to Charles Goodyear

Edwardian 18k Gold Blue Sardonyx Signet Ring tiffany & co This brooch features two facetedDATE: Edwardian, c. 1910 Elegant antique signet ring dating from the early 20th century, circa 1910. The long oval head is set with a blue sardonyx panel, yet uncarved, but ready for its nicolo intaglio (or to be honest it looks great blank as it is). The ring is crafted in 18 karat gold, featuring stylish pierced trifurcation to the shoulders. STONES Sardonyx MEASUREMENTS Head: 16. 3 x 7. 3mm Width of band: 1. 4mm WEIGHT 2. 7g MARKS Stamped 18ct