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AQUAMARINES
 Aquamarine
is always a shade of pastel blue, but darker,
more saturated tones almost always cost more.
Connoisseurs also prefer a pure blue, with no
green in it. Stones with a tinge of green can
be bought for less, and aren't necessarily less
appealing to a consumer.
Because the color is generally
pale, aquamarine should have a good clarity for
maximum brilliance. These stones are often cut
in ovals and emerald cuts. More saturated colors
are unusual in small sizes: usually it takes some
size for the color to hold in a darker shade.
Flattering to almost any skin tone, aquamarine
is a durable and lively gemstone that is appropriate
for almost all jewelry occasions and wearers.
 Aquamarines
should never be cleaned with mechanical cleaners.
However, warm water and mild soap can effectively
remove oils and dirt, which can build up to dull
aquamarine's blue color. Unlike emeralds, aquamarines
are usually not treated with fillers, resins,
or oils to reduce inclusions.
The advances of modern
technology have made it possible, and very common,
for aquamarine to be heat-treated to drive the
green out of the stone and leave a more pleasing
blue. This is a permanent treatment and has become
accepted in the jewelry industry.
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