Agate to Zircon

Alexandrite
Alexandrite is a variety of chrysoberyl with a distinct change of color when viewed in incandescent and fluorescent light. The ...
Read More
Read More

Andalusite
The name, Andalusite, is an homage to the city of Andalusia, Spain. Gem quality examples of this mineral species are ...
Read More
Read More

Aquamarine
Aquamarine is the blue variety of the mineral beryl. Most natural aquamarine is a pale bluish green, which was the ...
Read More
Read More

Azurmalachite
Sources Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 22-23. Schumann, Walter. Gemstones of the World, New ...
Read More
Read More

Biwa Pearl
Biwa pearls are a cultured pearl produced in a freshwater mussel native to Lake Biwa, Japan. Considered to be a non-nucleated pearl, they are ...
Read More
Read More

Bloodstone
Who on this world of ours his eyesIn Aries opens shall we be wiseIf always on his hand there liesA ...
Read More
Read More

Calcareous Concretion
Calcareous concretions are pearl-like growths produced in mollusks that lack nacre. While still composed of calcite and aragonite, the crystals are much coarser. Some ...
Read More
Read More

Calcium Carbonate
Calcium carbonate is a primary component of the shells of marine mollusks and pearls. The outer shells of mollusks are ...
Read More
Read More

Cave Pearls
Cave pearls are not actually pearls, they are a calcareous concretion occurring in subterranean limestone caves. While they bear a resemblance to pearls, ...
Read More
Read More

Chalcedony
Chalcedony is cryptocrystalline quartz. It is semitransparent to opaque and, depending on its color, chalcedony is further divided into several varieties. HistoryAll ...
Read More
Read More

Chlorastrolite
Chlorastrolite. Sources Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 49-50 ...
Read More
Read More

Chrysoberyl
Chrysoberyl is among the most brilliant of gems and its hardness is only surpassed by diamonds and corundum. The name ...
Read More
Read More

Chrysocolla
Chrysocolla is an intense blue-green to light blue variety of chalcedony. It can be translucent to semitransparent and is usually cut en cabochon. Tumbled ...
Read More
Read More

Chrysoprase
Chrysoprase is the name reserved for bright green cryptocrystalline quartz. It is a subvariety of chalcedony and owes its beautiful green color to the ...
Read More
Read More

Colored Stone
Colored stones are all gemstones that are not a diamond. The term is used as a general catch-all for gemstones.Georgian Style ...
Read More
Read More

Conch Pearls
A conch pearl is not technically a pearl at all, but a white or pink (sometimes brown or yellow), non-nacreous, product of ...
Read More
Read More

Conchiolin
A dark organic substance secreted by some invertebrate animal life including coral polyps and pearl producing mollusks. Conchiolin is the ...
Read More
Read More

Emeralds from Habachtal, Austria
Emeralds from Habachtal / Austria in Jewelry and arts by Nikolaus B.G. Lackner IntroductionPicture of Trapeze Cut Habachtal Emerald Placed on ...
Read More
Read More
Notes:
- Kunz, pp. 307-337↩