Sapphire:-
One of the most popular gemstones in its blue colors. Very dark grayish or greenish stones are abundant, as are heat-treated stones.
Grayish "geuda" is routinely heat-treated to improve color and clarity and provides the bulk of the sapphires seen today. Fine blue stones over 5 carats are rare and valuable. Another highly prized variety is the medium pinkish-orange padparadscha.
Ceylon (Sri Lanka), Burma, Thailand, Australia, Montana, and the Umba Valley region of east Africa provide a wide variety of colors.
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