This Antique White Opal stick pin was converted to the ring you see. The Opal is simply bezel set and paired with a wide 14k gold band to balance it out. The Opal scintillates with greens, reds and blues.
Here is a little history on opal lore https://www.gia.edu/opal-history-lore
Gemstones: Natural White Opal Measurements: 14.7 x 10.8 mm Weight: 3.80 cts estimated weight
Measurements: 12 x 16 mm / 5.2 mm high off finger / shank 2.4 mm wide Metal: 14k yellow gold Size: 7.5 Markings: 14K & Makers Mark on back Weight: 3.4 grams Circa: 1910
