Top 10 Gemstones that Occur In Only One Color

Metal_Treasure
Diamond, Sapphire, Topaz, Tourmaline and many other gems can occur in different colors.
But some gems can have only one color - they can only occur in different shades of the same main color.

The Top Ten

1 Emerald Emerald

Its name means “green gem”. That's a correct description - emerald can be only green.

Emerald can't be yellow, blue or red. - Metal_Treasure

2 Ruby

Ruby is only red and this main color can get some orange, pink or purple tones but it's basically red. - Metal_Treasure

3 Aquamarine Aquamarine

It's only pale blue that can have some slight green-ish hues (cyan) but that's all. Aquamarine can't be red, black or brown. - Metal_Treasure

4 Amethyst Amethyst

It's purple/violet only. For example, you can't find a green amethyst. - Metal_Treasure

5 Tanzanite Tanzanite

A blue gemstone that comes in a variety of blue tones. - Metal_Treasure

6 Morganite Morganite

It's only pink. - Metal_Treasure

7 Lapis Lazuli Lapis Lazuli

Its name means "blue stone" and it couldn’t be more accurate. - Metal_Treasure

8 Turquoise Turquoise

It's basically blue: light to dark blue or green-blue.
I think the color turquoise (a shade of blue) was named for this stone. - Metal_Treasure

9 Grandidierite Grandidierite

An extremely rare gem that occurs only in the color you see in the image that is a mix of blue and green (call it greenish-blue or bluish green, if you wish). - Metal_Treasure

10 Demantoid Demantoid

Demantoids are always primarily green (by definition) but the shades of green range from a very strong yellowish green to nearly the color of a fine emerald.
Demantoid is a member of the garnet group of minerals.
Mohs scale hardness 6.5-7.0/10 - Metal_Treasure

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