Ornamental quartz is a type of gemstone that is often used in jewelry and other decorative items. Two examples of ornamental quartz are AGATE and tigerseye. AGATE is a banded form of quartz that is usually found in a variety of colors, while tigerseye is a quartz with a golden-brown color and a silky luster. Both AGATE and tigerseye are popular for their unique patterns and colors, making them popular choices for jewelry and other decorative items.