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September-Sapphire |
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Colour Blue Formula Al2O3 with fe and ti Group Oxides Uses Jewellery and in industry Origins Found in placer deposits or igneous rock Locations Sri Lanka (oldest source), Thailand Sapphire is heat resistant and very hard (9 on the mohs scale). It is a form of corundum and similar in composition to ruby (aka red corundum). Pure corundum is colourless but sapphire appears blue due to the presence of iron and titanium.
The finest deposits can be found in India, although stocks are now very low.
