• Black Opal • Birthstone of October • 925 Sterling Silver • Handmade • Charming and everyday wear -- Translucent, vividly multi-coloured, and full of fire, these beautiful natural Black Opals have been set in a classic 6 prong sterling silver earring mounting. A perfect neutral stud earring, that will easily transition from day or workwear to kick up your heels out on the town.