Individuals who are born in October can choose between two birthstones: Opal and Tourmaline
Opal seems to encompass all the beautiful colors of other gems, making it the Queen of Gems in the ancient times. The gem is truly one-of-a-kind and as unique as human's fingerprints. No two Opal can be exactly the same. The color shifts as you turn and move the gem. Many will surely love the calming flashes of green and blue while others prefer the bright yellows and red. Although Opal comes in varieties, only a few such as the Boulder and Fire Opal are recognized universally.
When measured in Mohs scale of hardness, the gem falls into 5.5 to 6 level.
The term tourmaline came from "tura mali", a Sinhalese word that means "stone of mixed colors". Literally, the gem comes in many different beautiful colors. Some of the gems you can find are the black tourmaline which apparently comes in dark shades, the brown tourmaline, the elbaite, red tourmaline, green tourmaline, Paraiba tourmaline, partly-colored tourmaline, and colorless tourmaline.