The colour of a sapphire is determined by subtle variations in the amount of each element found in and around the gemstone.įor example, a yellow sapphire is caused by high amounts of iron within the stone. ![]() When combined under the immense pressure of the earth’s crust, these metals and minerals compress into sapphires. You might be wondering: how does a sapphire get its colour? Classed as a precious gemstone, sapphires are part of the corundum mineral family, meaning they’re composed of aluminium oxide, iron, titanium, chromium, copper and magnesium. ![]() The difference with bi-colour sapphires is that they cannot be synthetically produced. ![]() Similarly to diamonds, sapphires can be either grown in a lab or grown naturally in the earth over millions of years.
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