Metal parts: Alloy I've recently become fascinated with opals. This is a natural, high-quality opal. Different beauty can be seen when you change the angle. Notes: ***Photos are taken in natural light. Photos are not processed. ***Because I am an amateur, there may be some color differences between the actual product and the photos due to the shooting angle and lighting. Please understand! ***All are unprocessed natural stones. ***For perfectionists: There is no perfect thing in this world. Please keep this in mind. Please refrain from purchasing this product!!! Thank you for your understanding.