The strength of ruby’s red depends on how much chromium is present – the more chromium, the stronger the shade of red. Chromium can also cause fluorescence, which adds to the intensity of the red colour. ‘Pigeons’ blood’ is the name given to the colour that every ruby aspires to: the perfect balance of red that is caused by minute traces of chromium (only a few parts per million) and is not too purple or blue, but not too orange or pink either. For the last 800 years or so the most important source has been Burma, and more specifically the famous stone tract in the Mogok Valley.
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Ruby

The strength of ruby’s red depends on how much chromium is present – the more chromium, the stronger the shade of red. Chromium can also cause fluorescence, which adds to the intensity of the red colour. ‘Pigeons’ blood’ is the name given to the colour that every ruby aspires to: the perfect balance of red that is caused by minute traces of chromium (only a few parts per million) and is not too purple or blue, but not too orange or pink either. For the last 800 years or so the most important source has been Burma, and more specifically the famous stone tract in the Mogok Valley.

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