Treatments Used for Changing Colors of Gemstones
December 16th, 2007 at 7:46am |
When shopping for colored gemstones, another question you should definitely ask and one you could not evaluate without a definite honest answer is if the color is natural or applied. There are several commonly used and accepted color treatments that are applied to gemstones in order to change their appearance like heat treatment, irradiation, dyeing, and straining.
Read the rest of Treatments Used for Changing Colors of Gemstones