What Colour is October birthstone?

pink October's birthstones are pink tourmaline and opal. Tourmaline, the primary birthstone, is rare because it is one of the few gems that can be found in almost every color. Some pink tourmalines have clarity as transparent as diamonds! Opals, on the other hand, are in a class by themselves.

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Keeping this in consideration, 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. How much is October birthstone worth? The 17,000 Carat gemstone is valued at over $2.5 million. Opal deposits have been found on the planet Mars, as it was uncovered by NASA in 2008 that a fallen meteorite from nearly a century before contained opal.

Keeping this in consideration, what stone is the rarest?

Musgravite was discovered in 1967 and is arguably the rarest gemstone in the world. It was first discovered in Musgrave Ranges, Australia, and later found in Madagascar and Greenland. The first sizable gem-quality specimen was discovered in 1993.