Apatite is the gemological name applied to a series of related minerals. It can be found in a wide range of colors, but is better known for its blue to green varieties. Softer than many gemstones, apatite is best suited for earrings and pendants, but with proper care can be used in rings and bracelets. An exotic phenomenal variety, known as cat's-eye apatite, is a highly prized by gemstone collectors.