These are just a few attributes of Gems, there are more.

Alexandrite: Earth energy

Amazonite: Beltaine

Amber: Sun

Amethyst: Addiction

Apatite: Muscles

Aquamarine: Water - ships and seamen

Aventurine: Money

Beryl: Abdominal illness

Bloodstone: Physical protection

Carnelian: Oratory

Chalcedony: Fertility

Chrysocolla: Fevers

Chrysoprase: Eyesight

Citrine: Jaundice

Diamond: Fidelity

Diopside: Empathy

Emerald: Mother Goddess

Fire Opal: Samhain

Garnet: Blood

Hematite: Blood

Jade: Kidneys - Projection

Jasper: Abdominal illness

Lapis Lazuli: Third eye

Malachite: Repel evil

Moonstone: The Goddess

Obsidian: Fire

Onyx: see chalcedony

Opal: Secrecy

Peridot: Repel evil

Quartz: Physical energy

Rhodocrosite: Vision

Rhodonite: Attraction

Ruby: Repel poisons

Sapphire: Prophecy

Tanzanite: Fertility

Topaz: Healing

Tourmaline: Electricity

Turquoise: Thought