| F-J | K-O
| P-T | U-Z
| Pear Cut
Cut | Prong
Cut | Symmetry
Percentage | Tension
Setting | Trilliant
a style of jewelry setting in which numerous small diamonds
are mounted close together to create a glistening diamond crust that covers the
whole piece of jewelry and obscures the metal beneath.
the lower portion of the diamond, below the girdle.
Cut: a type of fancy shape diamond that resembles a teardrop.
each carat in a diamond's weight is divided into 100 parts, called "points."
A 1-Carat diamond has 100 points, a ¾ Carat has 75 points, etc. Points
in a fraction of one carat are measured within ranges, so that a ¾ Carat
diamond may have between .69 and .82 points and still be considered a ¾
refers to any blemishes on the surface of the diamond which are not significant
enough to affect the clarity grade of the diamond. Examples are faint polishing
lines and small surface nicks or scratches. Polish is as important as cut when
grading diamonds. Polish grades are Ideal, Excellent, Very Good, Good, Fair or
Cut: A type of brilliant cut fancy shape that can be either square or rectangular.
Setting: the diamond is held in place by a number of metal prongs, which
rise above the main body of the ring and are bent over the stone to hold it in
place. The number of prongs and their height above the main body of the ring vary
according to the stone's shape.
Radiant Cut: a
type of brilliant cut fancy shape that resembles a square or rectangle with the
corners cut off.
a diamond is more long than wide and this ratio compares that relationship. In
this ratio, width is always represented by the value '1'.To determine the value
of the length, divide the millimeter measurement of the length by the millimeter
measurement of the width. These millimeter measurements can be found at the top
left-hand side of the diamond grading report. Length-to-width ratio is used to
analyze the outline of fancy shapes only; it is never applied to round diamonds.
There is no 'ideal' ratio; it's simply a matter of personal aesthetic preference.
very small round diamond with only 16 or 17 facets, instead of the normal 57 or
58 facets of a full cut round brilliant. Single cuts are occasionally used for
pavé jewelry and other jewelry that uses numerous small diamonds set closely
diamonds are available in seven shapes: round (also called brilliant or full-cut),
marquise, pear, oval, princess, heart, pear and emerald. Which shape you choose
is purely a matter of personal preference. Don't confuse a diamond's shape with
its Cut, which is an evaluation of the diamond's proportions (and one of the 4Cs).
Of course, the most popular and commonly seen shape for diamonds is the round
or brilliant cut, which has 57 or 58 facets (depending on whether the culet, or
point at the bottom of the stone, is faceted or not). It's the 'classic' shape
that most people think of when they think of a diamond. Often considered the ideal
shape for a diamond, the round cut was first perfected by a diamond cutter and
mathematician named Marcel Tolkowsky, in his dissertation on the subject in 1919.
Sometimes called the 'Father of the American Brilliant Cut',Tolkowsky was the
first person to show that a diamond with 57 facets cut to specific proportions
would result in the highest possible fire and brilliance. Over time, it became
clear that it was not cost-effective to cut each and every diamond to these stringent
requirements, since diamond weight was lost and the diamond apppeared smaller
to the eye than a 'standard' cut of the same weight.
Cut: one of three styles of faceting arrangements. In this type of arrangement
(named because its broad, flat planes resemble stair steps), there are three concentric
rows of facets arranged around the table, and on the pavilion, there are three
concentric rows arranged around the culet. Other styles of faceting arrangements
include the brilliant cut (in which all facets radiate from the center of the
diamond to its outer edges) and the mixed cut (in which either the crown or pavilion
of a diamond is cut as a brilliant cut, and the other part of the diamond is cut
as a step cut).
part of a diamond's overall finish, symmetry is critical to a diamond's
value and its ability to refract light. In order to have good symmetry, a diamond's
facets must be cut exactly to specific mathematical proportions. Symmetry describes
several factors: how the facet edges align with each other; whether the corresponding
facets from opposite sides of the diamond align with each other; and whether the
facets from the crown, or top, of the diamond are properly aligned with the corresponding
ones on the bottom (pavilion). When choosing a diamond that has been graded for
symmetry, look for Good or Very Good ratings.
Table: the flat facet
on the top of the diamond. It is the largest facet on a cut diamond.
Percentage: a measurement of a diamonds table width, relative to
the width of the entire stone at its girdle, or widest point. This relationship
is critical for maximum fire and brilliance: too small or too large a table can
hamper the diamond's ability to disperse light properly and make it appear smaller
for its weight. Table percentage is often indicated on diamond grading reports.
Setting: this setting uses pressure to hold a stone between two open ends
of the metal mounting, making the stone appear as if it's floating.
Cut: a type of brilliant fancy shape that is triangular.
on diamonds: A-E | F-J
| K-O | P-T