Chrysoberyl Species and Variety

1. Chrysoberyl Species and Variety  /by  fran ladouceur  at Jul 3 2009,3:07 AM/
Information about the chrysoberyl mineral, it's properties, varieties and history
2. Different colors of alexandrite  /by  Marisa Spano  at Aug 6 2009,10:08 AM/
Good quality alexandrite is teal, emerald, or blue-green under natural daylight or fluorescent lighting that ideally changes to purple-red or red under regular incandescent light.