This is an artificial stone developed for decorative purposes, modeled after diamonds. It has a high refractive index and shines so similarly to a diamond that it's often mistaken for one. Material: The base metal is silver 925, with a platinum finish. This surface treatment increases the surface hardness, making it scratch-resistant and giving it the beautiful shine of platinum. It also prevents dulling and blackening, making it easy to care for. Size: Approximately 2cm (diameter of the pendant) Chain: Approximately 36cm to 41cm, adjustable This necklace is a no-brand item.