There are many color varieties of beryl. Emerald – green, Aquamarine – blue, Goshenite – colorless, Bixbite – red, Heliodor – yellow-yellow green, Golden beryl – lemon yellow-golden yellow, Morganite – pink-violet and salmon. There are also deeper green beryl not colored by chrome and therefore technically not an emerald.
Cutting Angles (culet/crown):
|Vargas:||Cerium oxide on acryl, Aluminum/tin oxide on tin or tin/lead|
|Olson:||Aluminum/cerium oxide on acryl or tin|
|Soukup:||Cerium/aluminum/tin oxide on tin or acryl|
|Christiansen:||Aluminum oxide on tin or tin/lead, Cerium oxide on acryl, Tin oxide on tin|
|Herbst:||Aluminum/cerium oxide or diamond on all common laps|
|Perkins:||Aluminum oxide on BATT or Corian|
|Raytech:||Aluminum/tin oxide on Fast Lap, tin or acryl|
|MDR:||Tin- or cerium oxide on tin, cerium oxide on acryl|
|Olson:||Tin oxide on leather, cerium oxide on felt|
|Christiansen:||Aluminum oxide/diamond 50k/100k on leather/wood, cerium/chrome oxide on felt|
|Cox:||Aluminum oxide on leather, Cerium/chrome oxide on felt|
|Covington:||Cerium oxide on felt, Aluminum/chrome oxide on leather, Diamond on phenol|
Beryl is heat treated or irradiated sometimes. Especially morganite is heated to remove the brown component and give it a more purple tone. Aquamarine is often heated to remove any yellow to make a greenish stone more blue. Emeralds are almost always treated with oil or epoxy.
Only emerald is synthesized. Synthetic aquamarine is in fact synthetic spinel or synthetic quartz. Quartz are being heated and rapidly cooled in green dye where it cracks and the dye fills the fractures. They are grinded and cobbed, and sometimes even given a fake matrix, and then sold to tourists as an "once in a lifetime" bargain.
Beryl is rarely troublesome for the cutter (more than the price). Golden beryl can lose its color if heated too much (>250 °C).
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