The link between heavenly bodies and gems is continued in the concept of birthstones. Birthstone lists vary because some are arranged according to the zodiac and some according to calendar months.
The list presented below is an abbreviated amalgamation of the most authentic traditions. However, it is always more beneficial to use a stone to which you are spontaneously attracted rather than one you feel you should have simply because it is linked to your zodiac sun sign, which is only one aspect of your full birthchart.
ARIES (March 21-April 19)
Carnelian, Bloodstone, Jasper, Diamond
TAURUS (April 20-May 20)
Tourmaline, Tigers Eye, Topaz, Emerald
GEMINI (May 21-June 20)
Aquamarine, Citrine, Chrysocolla, Tigers Eye, Pearl
CANCER (June 21-July 22)
Moonstone, Pearl, Ruby, Emerald
LEO (July 23-August 22)
Ruby, Heliodor, Sunstone, clear Quartz
VIRGO (August 23-September 22)
Sapphire, Peridot, Carnelian, Citrine
LIBRA (September 23-October 22)
Lapis Lazuli, Opal, Aventurine, Peridot
SCORPIO (October 23-November 21)
Obsidian, Herkimer Diamond, Topaz, Aquamarine
SAGITTARIUS (November 22-December 21)
blue Quartz, Amethyst, Malachite, Turquoise
CAPRICORN (December 22-January 19)
Jet, black Onyx, clear Quartz, black Tourmaline
AQUARIUS (January 20-February 18)
Amethyst, Sapphire, Chalcedony, Garnet
PISCES (February 19-March 20)
Turquoise, Pearl, Rose Quartz, Aquamarine
- source: "The Essential Crystal Handbook" by Simon and Sue Lilly.