Check out this post by Cerridwen Greenleaf
Gemstones and crystals have healing powers based on ancient belief systems passed down from the Chaldeans and metaphysicians of the old world. Among the treasure trove of knowledge they passed down are these crystal cures:
Sapphire has violet energy; worn first on Saturday on the middle finger of the right hand two hours before sunset, the stone is said to be curative for kidneys, epilepsy, tumors and sciatica.
Diamonds, containing rays of indigo light, are for eyes, nose, asthma, laziness and drunkenness, especially if worn on the right pinkie on Friday with the waxing moon. Worn on Sundays, diamonds enhance spiritual understanding when worn on the left ring finger.
Emerald has green light rays and can help with the heart, ulcers, cancer, asthma, and influenza, when worn on the right side pinkie on Wednesday two hours after dawn. On Tuesdays, wear it on the other hand for calm, sound sleep and to repel bad dreams and nightmares.
Pearls radiate orange rays and operate as a curative for work on Monday mornings. They help with insanity, diabetes, colic and fever.
Topaz has blue rays and helps with laryngitis, paralysis, hysteria, scarlet fever and assorted glandular disorders if worn on the right ring finger on Thursday mornings.
Magical Stones and Gems for Health, Wealth, and Happiness
With information on stones for each area of life, including love, work, home, and stress-busting, The Crystal Companion is a beautifully illustrated guide to using crystals and gemstones to channel positive energy into all areas of your life that need special attention. With chapters like “Birthstone Secrets: Discovering Your 4 Soul Stones,” “Tranquility Touchstones: Stress-Reducing Rocks,” and “Crystal Charms: How to Choose and Make Change-Your-Life Jewelry,” there something for both the beginner and the more knowledgeable in Greenleaf’s latest book.