This piece is a black rutilated quartz ring set in sterling silver. Size 8

This piece is a black rutilated quartz ring set in sterling silver. The gemstone is clear quartz containing natural needle-like inclusions of black rutile minerals, which are a form of black tourmaline. Gemstone: Black Rutilated Quartz (also known as Tourmalinated Quartz). Appearance: The stone is characterized by striking black needle-like fibers within a transparent or translucent quartz base.