18-karar gold over .925 sterling silver, .925 sterling silver Titanium Pyrite, Matte Black Onyx, Black Spinel gemstones Leather Fireline Wrap bracelet comfortably fits a size 6.5-7.5in wrist Button Closure It is customary to treat most gemstones to achieve enhanced color and durability. Some of these treatments may not be permanent, and may require special care.