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Gemological tool

Dichroscope

Reveals pleochroism, instantly eliminates singly-refractive stones

Typical price$ 50 - 200

PortabilityHighly portable

Field noteCompact, pocket size

Reading tips

Both windows show the same color = singly refractive (garnet, spinel, glass)
Two different colors = doubly refractive (ruby, sapphire, tourmaline, etc.)
Three different colors = trichroic (tanzanite, alexandrite, iolite)
Ruby: red / orange-red. Blue sapphire: blue / greenish-blue
Tanzanite: blue / violet / red-purple, the three must all appear