![]() They served as an inspiration to writers, poets, and painters, and were especially favorable to royalty. The usage of opals, as well as people’s deep appreciation for them, can trace to Ancient Rome. Since it can display a wide variety of colors at once, opal’s connotation was always related to magic, mental strength, and the supernatural.ĭue to their colorful properties, opals have an association with volcanoes, the moon, lightning, fireworks, constellations, and galaxies. While they are an affordable alternative to diamonds and pricier precious stones, they can still command high prices as well. They typically come from metamorphic and igneous rocks mined in Brazil and Africa. Unlike opals, which form in low temperatures, tourmalines usually form by hydrothermal activity and hot temperatures.īoth these October birthstones are quite popular and make beautiful pieces of jewelry. In fact, tourmalines display more colors and color combinations than any other gemstone. Since it can have a combination of all these elements, tourmalines virtually occur in almost every color, from bright red to colorless. Tourmaline is a silicate mineral that consists of crystalline boron. It can contain concentrations of iron, aluminum, magnesium, potassium, lithium, and sodium. Opal is a mineraloid, a type of hydrated silica. In other words, opal has a certain amount of water in it (from 6 to 20%). Main geographic sources of opal include Ethiopia and Australia. There are two types of opals – precious and common. Precious opals can display iridescence, otherwise known as a play-of-color. This gemstone can be translucent, transparent, or opaque, and it can appear in almost any hue, from different colors of the rainbow to gray and black. ![]() Both of these birthstone options are famous for containing a lot of color choices. Two gemstones represent the month of October: opal and tourmaline.
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