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B2C Jewels Grading System
Luster
Luster is the quality and quantity of light reflected from the surface of a diamond. In common expression this is also referred to as brilliance, sparkle, shine or fire reflected from a diamond.
In the B2C Jewels Grading System, 'EX' indicates 'Excellent Luster', 'VG' indicates 'Very Good', 'GD' indicates 'Good' and 'FR' indicates 'Fair' (i.e. decreasing amount of Luster). All these sub-grades also impact the pricing of the diamond.
Furthermore, some diamonds may contain a little whiteness or cloudiness, which are identified as 'Milky Luster Diamonds'. Such diamonds are further classified into sub categories depending upon the extent of the milky effect in them.
Luster Grade Description
ML1 Very Slightly Milky
ML1.5 Slightly Milky
ML2 Medium Milky
ML2.5 Medium Heavy Milky
ML3 Heavy Milky
ML3.5 Very Heavy Milky
ML4 Strong Milky
 
Shape Size Color Clarity Cut, Polish, Symmetry Luster
Pricing
Difference from
First pointer (%)
Round 2.019 G VS1 EX
Excellent
Very Good
Good
Fair
Very Slightly Milky
 
-2.0
-13.8
-23.9
-53.0
The table above indicates the price difference between the Luster grades while other parameters remain constant. The prices are subjected to individual grade and market trends.
*The above mentioned detail parameters are used for pricing purposes only.