Gemstone Therapy, Gem Therapy
Gems:

“A gemstone’s origin is locked in the secrets of the formation of the cosmos. Our sun is incapable of creating, through nuclear fusion, elements that are heavier than carbon. Yet, in many stones there exist elements such as chromium, manganese, vanadium and iron. These metals which give emerald its rich green color, the ruby its dazzling red, and sapphire its serene blue, were not created in the sun’s nuclear fusion cauldron. Rather they were captured during the formation of our solar system, bits of galactic debris, the dead remnants of exploded stars and collapsed planetary systems.”
The ratio of the velocity of light in air to its velocity in the gem mineral is known as the Refractive Index. Only the Refractive Index determines the latent brilliancy of any gemstone. A gemstone should also be durable.
Gemstone Therapy:
As in the color spectrum red, orange, yellow, green, blue, indigo and violet, the gemstones whose color hues incline toward the violet end of the spectrum are cool colors and have a tendency to depress the spirits, whereas gemstones whose color hues lean towards red end of the spectrum are considered warm colors and have tendency to excite.
In chromotherapy using gemstones, potency is the important characteristic. A good healing stone in chromotherapy should have (a) purity of color (b) no inclusions inside (c) rays of color lying inside the gemstone in strength, and, (d) should expose the genuine gem color if seen through a prism. Each gem has a genuine color distinct from the color we see through our naked eye. Diamond’s genuine (true) color is indigo though for the naked eye it may look white. Ruby’s is red, Emerald’s is green, Coral’s is yellow, Pearl’s is orange, Moonstone’s is blue etc.

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The Gemstones and the parts of the body they cure:
Ruby: Liver, spleen, gallbladder, and pancreas. For stopping bleeding powdered paste is used. If worn, it is believed to maintain the hygiene of your mental health.
Opal: For improving memory and for healthy brain
Turquoise: Eye ailments, headaches, fever
Emerald: Eye ailments, antidote for any insect or reptile poison, sores and wounds
Amethyst: Insomnia, tension, headaches used for spiritual upliftment
Diamond: Gastritis, cardiac ailments, blood circulation problems
Topaz: ENT related diseases, epilepsy, insomnia, asthma, lung, catarrh and many gynecological ailments
Pearl: For mental hygiene
Moonstone: Illness related to the mind, epilepsy, fever
The patient of a particular disease can wear gemstones associated with the cure for that disease as a ring, bracelet, necklace or any other ornament in gem therapy. This is what is referred to as Gem stone therapy or Gem Therapy.