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Individuals born in November can choose between two sunny gemstones to brighten up this chilly month. Topaz and citrine look so similar, in fact, that they've often been mistaken for one another throughout history. They are unrelated minerals, and topaz occurs in a wide spectrum of colors far beyond yellow. Both of November's birthstones are abundant and affordably priced, even in large sizes, which means everyone can find a way...

October also has two birthstones; Tourmaline and Opal. Tourmaline is a favorite gemstone for many because it’s available in a rainbow of beautiful colors. Opal gemstones are truly unique because each individual gem is adorned with a one-of-a-kind color combination.

Gem-quality bright blue to green “Paraíba”-type Cu-bearing tourmaline is now known from deposits in Africa (Nigeria and Mozambique), in addition to three commercial localities in Brazil (in Paraíba and Rio Grande do Norte States). Stones from these new localities have been mixed into parcels from the original Brazilian Paraíba occurrence. The Nigerian and Mozambique tourmalines that show saturated blue-to-green colors cannot be distinguished from the Brazilian material by standard gemological...