Aquamarine 
Be3Al2(SiO3)6 - Beryllium Aluminium Silicate
Aquamarine derives its name from "sea water". Aqua (water) sparkles like the sea and its color is pale to deep blue, often tinged with a hint of sea-green-hence the name. The highest quality is transparent. According to some legends, it is the treasure of mermaids, with the power to keep sailors safe at sea. Aquamarine is said to be a particularly strong charm when immersed in water (which is a good thing, since that is when sailors need its power most!) More on...
Colors:
Lustre:
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The aquamarine was adopted as the official state gemstone on April 30, 1971, by an act of the General Assembly. The mountain peaks of Mount Antero and White Mountain in Colorado are among the finest quality localities known for gem aquamarine. They are also among the highest in elevation, located at 14,000 feet. The granite rock of these peaks contains pegmatite bodies that are characterized by large miarolitic cavities containing the gem quality aquamarine crystals. The cavities are found through a vertical area of a mere 500 feet. The crystals in these cavities range in color from light blue to pale and deep aquamarine green, and in size from very small to 6 cm in length. Citation: House Bill 1104, 1971; Colorado Revised Statute 24-80-912.
Care and Treatment
Clean your Aquamarine in ultrasonic jewelry cleaner or with warm, soapy water and a soft bristle brush. Do not clean in a home ultrasonic machine. As with all gemstones, care should be taken to protect it from scratches and sharp blows.
Aquamarine often becomes paler if left out in the sun.
Aquamarine is usually heat treated and sometimes irradiated.
Reputable dealers will not use these misleading terms:
"Brazilian Aquamarine" is really Blue Topaz.
"Siam Aquamarine" is really heat-treated Blue Zircon.
"Mass Aqua" is blue glass.
Hardness
Aquamarine has a hardness of 7.5.
Specific Gravity: 2.68 to 2.73
Healing
Fluid retention; coughs; fear; thymus gland; calms nerves; problems with eyes, ears, jaw, neck, stomach, teeth; mental clarity; meditation.
Birthstone Months
Star Stone Months
Anniversary Gemstone
Mystical Properties
Aquamarine is often used to (hopefully) experience love and mercy. It is said to help ease depression and grief.
Lore
According to some legends, it is the treasure of mermaids, with the power to keep sailors safe at sea.
Aquamarine is said to re-awaken love in long-married couples and signify the making of new friends.
Legend has it that to wear aquamarine in earrings would bring love and affection. It is given as a symbol of beauty, honesty, and loyalty.
The name "aquamarine" means sea water.
Aquamarine is the US State Gemstone of Colorado.
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