Thursday, February 25, 2010
Heat can improve gemstones color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is commonly practiced. Most citrine is made by treating amethyst with heat and partial heating with strong gradient results in ametrine - a stone partly amethyst and partly citrine. Much aquamarine is heat treated to remove yellow tones and to change the green color into the more desirable blue or enhance its existing blue color to a purer blue. Nearly all tanzanite is heated at low temperatures to remove brown undertones and give a more suitable blue/purple color. A considerable portion of all sapphire and ruby is treated with various heat treatments to improve both color and clarity.
When jewelry containing diamonds is heated the diamond should be protected with boracic acid; else the diamond could be burned on the surface or even burned completely up. When jewelry containing sapphires or rubies is heated up, it should not be coated with boracic acid or any other substance, as this can etch the surface; it does not have to be "protected" like a diamond.
Labels: Heat treatment to Gemstones
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