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Round
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This shape is the
benchmark to graders who will give higher grades to shapes
which are most similar to it in proportions and symmetry. It
is also known as the "Ideal Cut" and It consists of 58 facets.
33 in the crown (the upper half above the girdle) and 25 in
the pavilion (the lower half below the girdle). It achieves
maximum fire and brilliance due to the fact that it is
calibrated through a precise formula.
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Oval
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The shape has perfect
symmetry. It is elongated which gives a long elegant illusion
to the small hand. It is very popular for anniversary rings.
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Marquise
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A traditional shape
which name is inspired by the marquise de pompadour, who was
popular for his pointy smile. The shape is elongated and has
two pointed ends. Best when used as a solitaire.
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Pear
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This is actually a
combination of the marquise and the oval shapes. It has one
pointy end like the marquise and one oval end. It resembles a
teardrop. It has fairly good light performance and is mostly
used for pendants or earrings.
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Radiant
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This shape is a
perfect solution which combines the elegance of the Emerald
with the brilliance of the round. It has 70 facets which
maximize the color refraction effect. More weight is directed
towards its depth in order to maximize brilliance.
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Heart
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This the ultimate
symbol of romance. It is usually hard to find in the market
due to low demand. It resembles the pear shape though it has a
cleft at the top. A manufacturer may prefer to cut the rough
in a heart shape rather than in a pear shape, if there is an
inclusion in the cleft.
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Princess
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This shape is rather
new and belongs to the Mixed cut family (link: to the
paragraph about mixed cuts in the CUT section). It appeals to
many people since it has a rectangular shape and is yet very
similar to the round brilliant in its light performance. It
has numerous sparkling facets. Well known and respected
gemological labs such as AGS, have developed princess cut
grading standards which are quit similar to the brilliant cut
standards
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Emerald
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The Emerald shape is
a step cut (link to the step cut paragraph in the CUT page)
and thus has a very weak light performance. Its concentric
flat planes resemble stair steps. The Emerald cut is very
popular and fashionable since it carries an antique statement
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Asscher
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The "Asscher cut
diamond" was developed in 1902 by the Asscher Brothers of
Holland. It is a stepped square cut (like the Emerald cut),
often called the "square emerald cut" and has cropped corners.
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