J.B. Grading System
Our diamonds pass through rigorous quality control and are assessed finely by qualified craftsmen. Each flawless diamond complies with stringent specifications of color, clarity and shape.
  • Fluorescence Intensity
  • Fluorescence Color
  • Luster
Fluorescence Intensity (fi)
When we speak of Diamond Fluorescence, we are referring to the diamonds tendency to emit a soft colored glow when subjected to ultraviolet light (such as a "black light"). Fluorescence is a form of illumination that is created when a diamond is exposed to low or high wave ultraviolet radiation. Faint or medium fluorescence will rarely affect a diamond's appearance. Usually fluorescence is unnoticed by the human eye in ordinary light. Fluorescence can cause a diamond to appear less clear or slightly hazy if the diamond exhibits very strong or extreme fluorescence. When selecting your diamond it is best to choose a diamond that has no fluorescence or faint to moderate fluorescence.
Code Description Image
N – NONE This diamond do not have any fluorescence
F – FAINT / VERY SLIGHT This diamond have weak fluorescence, not a significant influence on color
M – MEDIUM / SLIGHT This diamond have average fluorescence, small influence
S – STRONG This diamond have strong influence, substantial color influence
VS – VERY STRONG This diamond have very strong influence, substantial color influence
Fluorescence Color (FC)
When we speak of Diamond Fluorescence, we are referring to the diamonds tendency to emit a soft colored glow when subjected to ultraviolet light. Different diamonds emit different colors, examples of which are listed below
BL- BLUE
YL -YELLOW
WT-WHITE
OR-ORANGE
GR-GREEN
LUSTER (LU)
This is another parameter, which has been found of importance in determining the exact purity of the diamond. The amount of light that the stone reflects and the type of light that is emitted by the stone determine luster of a diamond. Luster refers to the quality of a surface in reflected light. The luster of a diamond is usually described as adamantine luster.
Code Description
L1 – VERY GOOD This diamond has very high quality reflection and emission of light.
L2 - GOOD This diamond has high quality reflection and emission of light
M1 - LIGHT MILKY This diamond has low quality reflection and emission of light
M2 – MEDIUM MILKY This diamond has very low quality reflection and emission of light.
M3 – HEAVY MILKY This diamond has very very low quality reflection and emission of light
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J. B. And Brothers Pvt. Ltd. is a Group Company of Yaelstar B.V.B.A., a Sightholder of the De Beers Group of Companies