Top 10 Gemstones that Exhibit Different Colors when Observed at Different Angles (Pleochroic Gemstones)

Metal_Treasure
Pleochroism is an optical phenomenon where a gem has different colors when observed at different angles. This ability makes some gems more interesting.

The Top Ten

1 Andalusite Andalusite

Andalusite has very strong pleochroism, which gives andalusite unique combinations of color.
Colors that can be seen from different angles: green-brown, dark red, purple/ violet - Metal_Treasure

2 Alexandrite Alexandrite

Another gem with strong pleochroism.

Colors that can be seen from different angles: blue, dark red, purple, orange, green (the image shows part of these colors) - Metal_Treasure

3 Iolite (Cordierite) Iolite (Cordierite)

A lesser known gem with cool color(s) and very good hardness (7-7.5 / 10).

Colors that can be seen from different angles: blue, violet, pale yellow, pale blue - Metal_Treasure

4 Tanzanite Tanzanite

Colors that can be seen from different angles: blue, red-purple, yellow-green.
But yellow-green hues aren't desired in this gem and Tanzanite usually gets treatments that remove them. - Metal_Treasure

5 Kunzite (Spodumene) Kunzite (Spodumene)

Colors that can be seen from different angles: violet, clear/colorless, pink, purple - Metal_Treasure

6 Kyanite
7 Benitoite Benitoite

From colorless to dark blue, depending on the angle - Metal_Treasure

8 Green Tourmaline Green Tourmaline

Colors that can be seen from different angles: green, blue-green, brown-green, yellow-green - Metal_Treasure

9 Zircon Zircon

Blue zircon has the strongest pleochroism in the zircon family.

Colors that can be seen from different angles in a blue zircon gem: blue, clear/colorless, gray - Metal_Treasure

10 Sphene (Titanite) Sphene (Titanite)

Green, brown-green, blue-green - Metal_Treasure

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