How to Identify Diamond Quality

How to Identify Diamond Quality


 

The 4Cs of Diamond Quality

Diamonds certainly come in a variety of sizes, colours, and shapes. The 4Cs define a diamond's individual characteristics, and the value of a diamond is determined by these characteristics. The terminology used to discuss the 4Cs have evolved into a foreign language that jewellers can use to identify and analyze individual diamonds.

CARAT
The first is the precision with which diamonds are weighed. Diamond weights are stated in metric carats, abbreviated “ct.” One metric carat is two-tenths (0.2) of a gram—just over seven thousandths (0.007) of an ounce. One ounce contains almost 142 carats. A small paper clip weighs about a carat.

The metric carat is divided into 100 points. A point is one-hundredth of a carat.

Diamonds are weighed to a thousandth (0.001) of a carat and then rounded to the nearest hundredth, or point. Fractions of a carat can mean price differences of hundreds—even thousands—of dollars, depending on diamond quality.

COLOR
Diamonds are available in a variety of colours. Diamonds in the standard colour spectrum range from colourless to light yellow and brown. Colourless diamonds are the most valuable within the range because they are the rarest. They developed the benchmark for grading and pricing normal-colour diamonds.
Blue is the most common fluorescent colour in gem-quality diamonds. In rare instances, fluorescence can be white, yellow, orange, or many other colours.

CLARITY
Clarity is the relative absence of inclusions and blemishes. While clarity characteristics can have a negative impact on a diamond's value, they can also have a positive impact. For one thing, they aid gemologists in distinguishing genuine diamonds from imitations. In addition, since no two diamonds are alike in terms of inclusions, they may aid in the identification of individual stones. They may also provide useful knowledge to scientists about the creation of diamonds.

CUT
The proportions of a diamond decide how light acts as it reaches the diamond. The diamond would appear dark and unattractive if light enters through the crown and exits through the pavilion. Diamonds with varying proportions and a high polish allow great use of light, making them brighter, more vivid, and more scintillating.  The quality of the cut is crucial to the diamond's final beauty and value. As a general rule, the higher the cut grade, the brighter the diamond. 

Source: gia.edu

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