![]() ![]() Unusual mixtures of impurities can also produce commonly recognizable colours in sapphires, or may even change hues depending on the lighting conditions under which the gemstone is viewed. As mentioned previously, corundum gemstones may be colourless if no significant impurities are present this is known as “white sapphire”.Ī pinkish purple sapphire. A mixture of chromium (Cr 3+ ) and ferric iron (Fe 3+ ) can produce an orange colour, but in some cases vanadium (V 3+ ) may also play a role. A mixture of chromium (Cr 3+ ) with ferrous iron (Fe 2+ ) and/or titanium (Ti 4+ ) can cause a purple colour, but some shades of violet may also be caused by vanadium (V 3+ ). Small impurities of chromium (Cr 3+ ) can cause a pink colour. Impurities of ferric iron (Fe 3+ ) may produce a yellow colour, and when mixed with ferrous iron (Fe 2+ ) may also produce a green colour. Beyond this, there are a number of other elements which may be found as impurities within sapphire that are behind the polychromatic nature of this gemstone. ![]()
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