The Ancients used gemstones to describe the planets.

This beautiful desk set includes the planets in proportionate size and uses polished gemstones to represent the planets. (not necessarily the same as those used by the ancients)

The planets are represented by:
Mercury: Labradorite
Venus: White Quartz
Earth: Sodalite
Mars: Mahogany Obsidian
Jupiter: Tiger's Eye
Saturn: Yellow Calcite
Uranus: Amazonite
Neptune: Blue cat's Eye
Pluto: Poppy Jasper