Add a unique touch to your collection with our Tiger Eye unpolished tumblestone ornament. Tiger's eye (also called Tigers eye or Tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre. The undulating contrasting bands of colour and lustre make it a popular member of the quartz group. Curious Minds Did You Know?¬â€ Quartz crystals have a piezoelectric property that is widely used in electronics to make watches, radios and many other electric devices!