11 9mm x 5 9mm x 3 6mm deep faceted from a natural andalusite crystal found in brazil price. Andalusite gemstones are remarkable for their fascinating color habits and very strong pleochroism which can cause a muliticolored effect of shades of yellow olive green and reddish brown within a single gem although andalusite as a mineral is not uncommon the transparent variety used as a gem is very rare. This gem received this name from the french mineralogist jean claude delamétherie in 1798 after its supposed source.