These .925 Sterling Silver earrings feature high quality lab created blue opals and rich purple Cubic Zirconia, CZ stones in a stylish, wild iris flower design. ---Most Opals used in Jewelry are grown in a lab or, "Lab Created" like the Opals used in our Jewelry. Natural Opals are a soft stone and prone to cracking. Lab Created Opals are strong, more vibrant and have "Fire" and consistency to their coloration. Additional Details ------------------------------ Product description: These .925 Sterling Silver earrings feature high quality lab created blue opals and rich purple Cubic Zirconia, CZ stones in a stylish, wild iris flower design. ---Most Opals used in Jewelry are grown in a lab or, "Lab Created" like the Opals used in our Jewelry. Natural Opals are a soft stone and prone to cracking. Lab Created Opals are strong, more vibrant and have "Fire" and consistency to their coloration.