Top 10 Gemstones with 6-sided Rough Crystals

The Top Ten

1 Aquamarine

2 Purple Taaffeite

In the image you see the cross section of the crystal - it has 6 sides. The cross sections of all gems on this list look like that.

3 Emerald

4 Trapiche Emerald

5 Red Beryl (Bixbite)

6 Colorless Taaffeite

7 Morganite

8 Maxixe

It's a deep blue version of aquamarine (found mainly in Madagascar).
It looks like blue sapphire but it's more transparent than blue sapphire.
(I added the image)

9 Goshenite

10 Green Beryl

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