Phillip Gavriel 18k Yellow Gold and Sterling Silver Amethyst Filigree Bypass Dragonfly Ring From the Dragonfly Collection designed by Phillip Gavriel New York This ring is made of 18k yellow gold and sterling silver with natural amethyst. Ring comes in sizes: 6, 7, 8. The width of the ring is 18mm. It is stamped: 18k 925.