This necklace includes natural Australian Fire Opal gemstones measuring 4x6mm, and high quality cubic zirconia's (opals and natural fire opals that are dyed black). This necklace is 925 sterling silver and platinum plated, also available in gold or rose gold color (necklace is 45cm in length and adjustable). This item includes a gift box and a certificate of authenticity with purchase. This item is made to order, please allow 10-15 days for processing and delivery.