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ID #: c553
Type: Iolite
Nb. Piece: 1
Weight: 15.19 carats
Size: 15x17x9 mm
Shape: Rough, Uncut
Clarity: SI (Inclusion(s) may be seen with the naked-eye but do not affect or inter fere with the overall beauty of the gem)
Color: Blue
Hardness (Mohs scale): 7 - 7.5
Treatment: Unheated
Origin: Tanzania, a country in East Africa,
Comment: The gemstone has been photographed in natural light.

Iolite is the gem variety of the mineral Cordierite. It has a blue-violet color attractive that is unlike other gemstones. The pleochroism is very pronounced in iolite and is seen as three different color shades in the same stone.

Pleochroism is an optical phenomenon in which a substance appears to be different colors when observed at different angles (from Wikipedia).


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Natural Blue Iolite, Tanzania (Africa), Unheated, Rough (Uncut) 15x17x9 mm, 15.19 carats