Multicolor agate gemstones belong to the quartz family of minerals. This group of quartz is the second most abundant mineral on the earth's crust. Agate gemstones occur in a wide range of colors and patterns, and almost all agate will be multicolored due to unique banding.

What stone is colorful?

Ruby is the most popular colored stone. When the mineral known as corundum is of gem quality and a vivid red color, it is called "ruby." Historically mined in Asia, many rubies such as these are now being found in Africa.

What rock has rainbow colors in it?

Iris agate is a finely-banded agate that can produce a rainbow of color from a diffraction grating effect.