What does tourmaline look like?

Iron-rich tourmalines are usually black to bluish-black to deep brown, while magnesium-rich varieties are brown to yellow, and lithium-rich tourmalines are almost any color: blue, green, red, yellow, pink, etc. Rarely, it is colorless.

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What is a black spinel?

Black spinel stone is a rare gemstone made up of hard vitreous magnesium aluminium oxide or magnesium aluminate. Specifically, black spinel is one of the rarest minerals that comes from the Spinel family and is a true gemstone often confused with black tourmaline. Thereof, what colour is spinel? Spinel is a transparent to opaque gem, with colors as vivid as ruby-like reds, some darker "brick" red, and some almost orange. Spinel comes in blue, with the finest stones comparable to that of sapphires, and considered extremely rare.

Subsequently, why does august have 3 birthstones?

Peridot, spinel and sardonyx are the three birthstones for August. The peridot birthstone is known for being formed under extreme conditions, as it can be found in the hardened lava that carried it from deep within Earth's mantle as well as in meteorites that traveled from outer space. One may also ask what is the cheapest birthstone? Ruby and diamond are the most expensive gemstones on the earth but Garnet is the least expensive gemstone on the earth. This gemstone is the birthstone of January month.

Consequently, what is the rarest birthstone?

February babies have the rarest birthstone of all. Diamond (April) is the rarest birthstone in a total of six states, while topaz (November) is the rarest birthstone in Montana, Wyoming, and Rhode Island.