Dyed Stone
A gemstone to which an artificial stain is added to improve color or to imitate a more valuable gemstone.
Face
The plane surfaces which form the sides of a crystal.
Much of the material found on the market today is dyed white Opal, so if the price is inexpensive buyers should be aware that it is probably a dyed stone as natural stones are quite expensive.
A dyed stone whose shades are very similar to natural aquamarine: beachy blues and sandy browns. The crackled appearance is created by applying heat, hence the name "fired.
This is the national stone of Peru and, unfortunately, in recent years dyed stones have been mass marketed by unreputable dealers as Peruvian Blue Opal. If the blue color is uneven you are probably looking at a dyed stone.
This red jasper is a natural un-dyed stone, like all gemstones, but the color is an intense red, somewhere between brick red and fire red. A strong protection gemstone, red jasper is known to protect against hazards of the night.
There are specially formulated cleaning solutions for use on softer stones, but you should still use caution when cleaning. Solvents should be avoided when cleaning any oiled gemstone such as emerald, or dyed stones such as lapis lazuli or onyx.
They are compressed and shaped. They are saturated with resin. Imitation Turquoise is dyed stone or even plastic. It is made to resemble the gem. It is shiny and oily. If Turquoise is dipped in color, it should be mentioned.
 See also: Stone, Gemstones, Jewel, Color, Gemstone
  
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