Opals come in a wide variety of colors, including white, black, blue, green, red, and more, with black opal being the rarest and most valuable. The gemstone can be transparent, translucent, or opaque and has a hardness of about 5.5 to 6 on the Mohs scale. Opal is prized for its captivating iridescence and is the birthstone for October, symbolizing creativity, inspiration, and emotional balance.
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