Sapphires
are found in many colours besides blue, though the word sapphire does in fact come from
the Latin word sapphirus, which in turn is derived from the Sanskrit word for blue.
Sapphires are occasionally colourless or, as we call them, white. Sometimes they are
grey, but most commonly green, violet, purple, orange, yellow, brown, pink or black.
Blue sapphires are found in considerable numbers in Sri Lanka and are
invariably cut locally, often very poorly. Frequently the colour in these stones is
present in only a small area. When cut, the blue area forms the base of the faceted
stones, so that looked at through the top they exhibit a good blue colour; viewed from the
side, however, many of them appear colourless. Sri Lanka sapphires also tend to dake
on a purple hue in artificial light. Anyone buying a sapphire ring should check that
it looks equally attractive in natural and artificial light. Heat treatment of poor
quality sapphires is now common, but as the change is believed to be permanent the
resulting fine blues and yellows are sold as if untreated.
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