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Diamond Knowledge (4C)


CUT GRADE refers to a diamonds proportions and the quality of its finish. A well-cut diamond (Excellent Grade) captures the light around it and makes that light perform in breathtaking ways. 

Cut Grade can be divided into FIVE grades : 

Excellent, Very Good, Good, Fair and Poor.

PROPORTION refers to a polish diamonds dimensions, facet angles and the relationships between them.

For standard rounded brilliant diamonds, reports the measurements of eight proportions. For fancy shape diamonds (those other than standards round brilliants), reports measured values for table size and total depth. For all diamonds, girdle thickness and culet size are reported with word descriptions based on visual assessments.



FINISH refers to the quality of a diamonds polish (the overall condition or smoothness of its surface).



POLISH is visually assessed and graded in one of the following categories : 

Excellent, Very Good, Good, Fair and Poor.


SYMMETRY exactness of its outline, and the shape, placement, and aligment of its facets.


Its height measured from the culet to the table (57.5% - 63.0%)


table is the largest facet of the stone, comprising the flat surface on the top. The table percentage is the ratio of the width of the diamond's top facet in relation to the width of the entire stone (52% - 62%)


Forming the outer edge of the diamond, this is where the crown and the pavilion meet and is the widest part of a diamond. (THN to STK)

4. CROWN       ANGLE

the degree of the angle formed between the table and the girdle.(31.5°- 36.5°)


the height of the diamond from the girdle edge to the surface of the table facet. (12.5% - 17.0%)


pavilion angle is the angle of the pavilion facets in relationship to the girdle plane.(40.6% - 41.8%)


measured from the culet to the intersection of the pavilion main facet and the girdle


Culet size is described as the width of the culet facet. (NONE - SMALL)


length of the star facet expressed as a percentage of the girdle-to-table distance. (45% - 65%)

10. LOWER        GIRDLE         /

      LOWER        HALVES

he length of a pair of lower-half facets expressed as a percentage of the girdle-to-culet distance. (70% - 85%)


The color of every piece of diamond varies slightly, the different natural hues are classified into 23 grades starting from D to Z. The most rare and valuable is the Colourless grade D, E and F, the most common are Near Colourless grade G, H, I and J ; Sightly Tinted grade K, L and M;“Very Light Yellow grade N, O, P, Q and R ; Light Yellow grade S, T, U, V, W, X, Y and Z; Grade Z+ are Coloured Diamonds. Diamonds also have some other variety of colours, for example : brown, orange, pink and blue etc.


A diamonds weight is measured in carats. One carat is equal to 0.2 gram, and is divided into 100 points, so that a diamond of 0.50 carat is described as a diamond of 50 points.


Every diamond contains natural birthmarks in the form of minute traces of other minerals arisen during the crystallization process. The more and larger the intrusions are, the greater the influence would be.


Diamond with fluorescence, some may have phosphorescence. 

Fluorescence (FLUORESCENCE) indicator means when the diamond under the strong ultraviolet light blue or other colors of light. Fluorescence only has little effect on the value of diamonds. The fluorescence of diamonds being particularly strong, there is therefore a part of the diamond will affect its transparency. Sometimes, the fluorescent yellow line to improve the color of the diamond level, because of the blue and yellow near colorless, so the formal diamond grading certificate, in general, that a fluorescence level. 



(1) NONE






The above information for reference only.