Also referred to as "damsonite," amethystine chalcedony is an opaque to semi-translucent variety that is, you guessed it, purple. As chalcedony is technically a quartz, this gem is much like traditional amethyst and even can be heat treated to become a yellowish orange citrine color.
Amethystine Chalcedony Classification
||Amethystine Chalcedony |
Sardonyx is a form of onyx that is made up of bands of red sard and white chalcedony. Because ofits banded patterns, sardonyx has been used for years in making cameos.
Sardonyx Characteristic Physical properties
||Sardonyx has white and/or black bands alternating on carnelian or sard colors and this is what separates sardonyx from other calcedonies. |
Chrome chalcedony contains chromium, normally seen in the most coveted gems in the world; namely alexandrite, emerald and ruby. Present in small amounts, chromium gives these stones their unique shades of green, which have been compared to green seawater. Chrome chalcedony is usually untreated, as absolutely nothing is required to make this stone desirable! Although chrome chalcedony somewhat resembles chrysoprase in appearance, the two receive their color from two different elements.
Chrome Chalcedony Classification
||Chrome Chalcedony |
Chrome Chalcedony Optical Properties
||Light grayish pink or reddish |
Chrome Chalcedony Characteristic Physical properties
||Chrome chalcedony might contain black chromite crystals. Look for lack of dye concentrations to separate from dyed chalcedony. |