Beware of Dishonest Gem Dealers Fake Diamonds - Man Made Diamonds Trends in Gems How To Value The 4 'C's   Optical Properties of Gems The beauty of gems is largely characterized by their optical properties, particularly the degree of refraction of light and color. Diamond is prized for it’s brilliance and fire and it’s changes in hue and size as the stone is moved around. Opals display brilliant areas of color caused by interference and refraction of light within the gem. Luster is the appearance of the gem is as seen by reflected light and luster is often used when describing pearls. Rubies and emeralds are prized for the intensity of their colors, which are even more intense under strong light. Star sapphires and star rubies exhibit a star effect called asterism within their color.   Benefits   Testimonials   Diamonds   Opals   Pearls   Sapphires   Rubies   previous page next page
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