Diamond – other attributes
1) Symmetry & Polishing
Symmetry, a grade given to the overall uniformity of a diamond's cut. With poor symmetry, light can be misdirected as it enters and exits the diamond, which will hurt a diamond's sparkle and shiny level, caused by loss of light as it flows through the stone and out to your eye. Hence, we recommend only diamonds with very good to excellent symmetry.
Polishing, a grade given to the external finish of the diamond. With poor polish, the surface of the diamond can be dulled, and may create blurred or dulled sparkle. The polishing grades from poor to excellent. Good polish is crucial for maximum brilliance of a diamond, but it takes a trained eye to distinguish between polish grades.
Fluorescent, a glow, usually of a bluish color, which emanates from diamonds when exposed to UV light. Strong fluorescence should be avoided, but weak/ faint fluorescence does not significantly affect the appearance of a diamond. Even in some circumstances, faint or moderate blue fluorescence is preferred by some customers because it can make a yellowish color appearing more white or colorless under daylight.
For diamonds with lower color grading (such as J to M grade), slight to moderate or even strong blue fluorescence in a stone with these color grades actually helps cancel some of the yellow and makes it looks whiter. However, for a diamond with very high color (such as a D to F grade), fluorescence is thought to interfere with the flow of light and make the diamond appear a little oily or murky. As a result, Florescent Is not preferred with high color diamonds, which eventually also lowered the value of those diamonds.
There are many cuttings for diamonds, most commonly the round brilliant cut, heart cut and pear cut. Among all, round brilliant cut is the most popular of all cuts. The round brilliant cut is designed to give maximum sparkling level of diamonds with its ideal proportions. The brilliant cut comprised of 58 facets, it follows rough diamond natural shape, and thus is most popular for cutting due to the beauty it provided to the diamond. Generally, diamonds with round brilliant cut carries higher value as its demand is higher.
4) Certificate Institution
Grading a diamond involves subjective views and the standard could vary among institutes. As a result, diamond graded by different institutes would have different values even the given attributes are the same.
There are a lot of diamond grading institutes around the globe; among the most famous would include Gemological Institute of America (GIA), International Gemological Institute (IGI), Sigma International Gemology (SIG), Hoge Raad voor Diamant in Antwerp (HRD).
To protect your best interest, we suggest you to buy the diamonds certified from a respected third-party gemological laboratory to avoid costly mistakes. Hence we only offer diamonds graded by the two of the largest institutes, GIA and IGI, for more of their information please refer to below: