WHAT GEMS ARE USED?   Gem Colour/ Frequency Healing Energy Properties Ruby Red 625 nm Hot, heating, drying, energising, expanding Carnelian Orange 610 nm Cooling, moist, harmonising, anti-allergic Citrine Yellow 590 nm Warm, enlivening, cleansing Emerald Green 565 nm Cold, unifying, solidifying Topaz Blue 470 nm Cool, soft, satisfying, antiseptic Diamond Indigo 485 nm Stimulating, invigorating, clarifying, antiseptic, anti-depressant Sapphire Violet 400 nm Cool, tranquilising, soothing, analgesic, sedative