Diamond weights are
stated in metric carats, abbreviated “ct.” One metric carat is two-tenths (0.2)
of a gram. The metric carat is divided into 100 points. A point is one
hundredth of a carat.In general, there
is a ‘technique’ to maximize your budget. For example, instead of a 2.0-carat
diamond, consider buying a 1.9-carat weight of diamond. This will save a
considerable amount of money and the slight size difference will never be
A diamond's color
refers to its lack of color. The less color, the higher the color grade.
Gemological Institute of
America's (GIA) D-to-Z color-grading scale is the industry's most widely
accepted grading system. The scale begins with the letter D (The starting
letter of Diamond), representing colorless, and continues, with increasing
presence of color, to the letter Z. There are totally 23 grading levels. Many
of these color distinctions are so subtle that they are invisible to the
untrained eye; however, these distinctions make a very big difference in
diamond quality and price.
Since the diamond formed deep within the earth,
under extreme heat and pressure, they often contain unique birthmarks, either
internal (inclusions) or external (blemishes). Diamond clarity refers to the
absence of these inclusions and/or blemishes. The fewer and less
visible the inclusions and/or blemishes, the higher the clarity grade.
Diamonds without these birthmarks are rare, and rarity
affects a diamond’s value. Using the Gemological Institute of America’s (GIA)
International Diamond Grading System™, diamonds are assigned a clarity grade
that ranges from flawless (FL) to diamonds with obvious inclusions (I3). There are totally 11 levels of grade. In general,
it is worthwhile to select an "eye-clean" diamond - one that has no
imperfections visible to the unaided-eye through the crown.
Cut quality is the factor that fuels a diamond’s
fire, sparkle and brilliance. Not only do well-cut diamonds appear more brilliant, they also tend to
appear larger than other diamonds of the same carat weight. When
a diamond is cut with the proper proportions, light is returned out of the top
of the diamond. If it is cut too shallow, light leaks out of the bottom; too
deep and it escapes out of the side.
In Gemological Institute of America’s (GIA)
system, there is a relative scale from Excellent to Poor, totally 5 grades,
represents a range of proportion sets and face-up appearances. A Well-Cut Diamond is
perfectly proportioned to refract light, producing that fire and brilliance up
through to the table and crown.