Pleochroism
The color of some gems changes with the angle at which you
look. Diachronic when it comes to these gems have two colors in two directions
located at 90 degrees from each other and when trichroisme have three colors in
three directions, also located at 90 degrees from each other. The intensity of
the pleochroism of a gem is different to the other; it can be high, medium, or
low.
Pleochroism stone
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Blue
|
|
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Aquamarine (medium)
|
colorless-light blue / light blue-dark blu
|
|
Alexandrite (strong)
|
rouge- purple /orange
/vert dark
|
|
Apatite (strong)
|
bleu-jaune /bleu-incolore
|
|
Benitoïte (strong)
|
Clear / Dark Blue
|
|
Iolite (strong)
|
Clear / yellow / blue / dark blue-violet
|
|
Sapphire (strong)
|
violet-dark blue / green-light blue
|
|
Topaz (very low)
|
colorless / pale blue / pink
|
|
Tourmaline (strong)
|
dark blue / light blue
|
|
Zoisite (strong)
|
blue / red purple / yellow green
|
|
Zircon (strong)
|
blue / clear / gray
|
|
Green
|
|
|
Alexandrite (strong)
|
dark red / orange / green
|
|
Andalusite (strong)
|
dark green / dark red
|
|
Emerald (strong)
|
Green / Blue Green
|
|
Peridot (low)
|
yellow-green / green / colorless
|
|
Sapphire (strong)
|
green / yellow green
|
|
Sphene (medium)
|
dark green / blue green
|
|
Tourmaline (strong)
|
|
|
Zircon (low)
|
|
|
|
|
|
|
|
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Yellow
|
|
|
Citrine (very low)
|
pale yellow / pale yellow
|
|
Chrysoberyl (very low)
|
rouge-jaune/jaune-vert/vert
|
|
Danburite (low)
|
very pale yellow / pale yellow
|
|
Orthoclase (low)
|
pale yellow / pale yellow
|
|
Phénakite (medium)
|
Clear yellow / orange
|
|
Sapphire (low)
|
yellow / pale yellow
|
|
Spodumene (medium)
|
pale yellow / pale yellow
|
|
Topaz (medium)
|
yellow-brown / yellow / yellow orange
|
|
Tourmaline (medium)
|
pale yellow / dark yellow
|
|
Zircon (low)
|
yellow-brown / yellow
|
|
Red and pink
|
|
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Alexandrite (strong) -
|
dark red / orange / green
|
|
Andalusite (strong)
|
dark red / brown red
|
|
Morganite (medium)
|
pale red / red violet
|
|
Ruby (strong)
|
violet red / orange red
|
|
Tourmaline (strong)
|
dark red / light red
|
|
Zircon (medium)
|
purple / red brown
|
|
Purple and Violet
|
|
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Amethyst (very low)
|
purple / purple
|
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Andalusite (strong)
|
green brown / dark red / purple
|
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Beryl (medium)
|
purple / colorless
|
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Corundum (high)
|
purple / orange
|
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Spodumene (Kunzite) (strong)
|
Purple / Purple / Clear / Pink
|
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Tourmaline (strong)
|
pale purple / purple
|
|
Brown and
|
|
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Quartz (low
|
brown / reddish brown
|
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Sapphire (strong)
|
yellow-brown / orange
|
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Topaz (medium)
|
brun-jaune/brun-jaune dull
|
|
Tourmaline (very low)
|
dark brown / light brown
|
|
Zircon (very low)
|
brun-rouge/brun-jaune
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