Stone: Black Opal
Metal(s): Copper/Brass/Mixed Metals. May not be suitable for individuals with metal allergies.
Chain/Cord: Black leather cord, 1.5 mm in diameter
Closure: Adjustable double slipknot
Black opals are very rare, and are only found in Australia! Opals are mineraloids; water-filled amorphous silicates, which form via slow silicate deposits over time.