color,
The color scale of the GIA extends
from letter D (colorless) to letter Z
(light yellow or light brown).
Although many people are convinced that
the gem-quality diamond is colorless,
strictly colorless stones are a lot
rare. Most diamonds used
in jewelry it is actually nearly colorless with
yellow or brown shades.
Purity,
The purity scale of the GIA is composed
by eleven degrees covering the ranges
from Perfect to Included.
Since diamonds are formed at temperatures and
under extraordinary pressure, it is extremely
rare to find a diamond that does not have
internal features or present on the
surface. These characteristics, yes
consequence of the training process,
as well as constituting an identification fingerprint
of s stone, they are also of invaluable help
in the separation of natural diamonds from
synthetics and imitation.
Shape,
The GIA cutting scale ranges from Excellent
a Poor.
The secret of the beauty of a polished diamond lies
in the complex interaction between stone and light. The
magnificent aspect of what we observe derives
by the combination of three optical characteristics: the
brilliance, that is, that combination of reflections
of white light from both the surface and
from inside a diamond; fire, term that
refers to the "flare" of color emitted by a
diamond; the glitter, consisting of the light areas and
of shadow visible when the diamond, the source of light
or the observer move.
Carats
One carat is equivalent to 200 milligrams of
metric weight.
In the case of diamonds below one carat, it applies
the subdivision of the carat into 100 points, as well as for
example, a coin is split into cents.
0.75 ct. = 75 points, 1/2 ct. = 50 points.
