Source: Rob Lavinsky, – CC-BY-SA-3.0 Colorless Taaffeiteīeside purple, taaffeite also occurs as colorless crystals. Source: Rob Lavinsky, – CC-BY-SA-3.0 A clear crystal of taaffeeite with lavender edges Diamond is the birthstone for April while in astrology, the clear precious stone is the birthstone of Aries. ![]() Diamond is the most expensive of clear gemstones, with prices of up to $45,000 per carat. This make the clear crystal shine so brilliantly it appears white, hence the trade name white diamond. These clear rocks boosts of a 2.418 refractive index, which means that light is trapped in a diamond crystal more than twice longer the time it travels through air. The hardest on earth, diamonds are clear crystals in their pure form, when the mineral lacks impurities that would otherwise give it color. ![]() ![]() While found in colored varieties, diamonds are most popular as clear stones.
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