Safe for people with metal allergies. The 0.1 inch (3 mm) birthstone size is now available. Sold in pairs. Due to the nature of the product, it is a shape that is easy to fall off if you pinch the stone. Please be careful when handling it. Available in 12 colors of birthstone garnet amethyst aquamarine diamond emerald lexandrite ruby peridot sapphire light rose topaz blue zirconia. ◆ It does not shine as Swarovski but is cheap, so you can use it easily.