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The "chelsea" filter was originally devised by Anderson and Payne in 1934 of the Gem testing Laboratory of the London Chamber of Commerce & Industry.The filter was devised with the collaboration of gemmology students of the Chelsea College of Science and Technology where Basil Anderson was an instructor for the Gemmological Association of Great Britain.
Aquamarine (medium): clear / light blue, or light blue / dark blue Alexandrite (strong): dark red-purple / orange / green Apatite (strong): blue-yellow / blue-colorless
Aquamarine is a pale-blue to light-green variety of the beryl family, [2] with its name relating to water and sea. [3] The color of aquamarine can be changed by heat, with a goal to enhance its physical appearance (though this practice is frowned upon by collectors and jewelers). [ 4 ]
The deep blue version of aquamarine is called maxixe [19] (pronounced mah-she-she). [20] Its color results from a radiation-induced color center. [21] Faceted aquamarine. The pale blue color of aquamarine is attributed to Fe 2+. Fe 3+ ions produce golden-yellow color, and when both Fe 2+ and Fe 3+ are present, the color is a darker blue as in ...
Aquamarine. Madagascar aquamarine; Maxixe aquamarine - dab - Maxixe beryl; Mass aqua; Misnomers. Synthetic Aquamarine a misnomer for synthetic corundum or spinel. Brazilian Aquamarine a misnomer for Topaz; Siam Aquamarine a misnomer for Zircon; Emerald. Synthetic emerald. Emerald coated beryl - dab - Emerita, Symerald; Chatham emerald; Gilson ...
Aquamarine is often heated to remove yellow tones, or to change green colors into the more desirable blue, or enhance its existing blue color to a deeper blue. [ 42 ] Nearly all tanzanite is heated at low temperatures to remove brown undertones and give a more desirable blue / purple color. [ 44 ]