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Have you noticed the size of the culet of the loose diamond?
2023-06-01 20:22:33
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However, if the bottom facet is too large, all the light incident on the bottom facet from the front will leak out of the diamond, and it will appear as a small dark window when viewed from the front, which will have a negative impact on the appearance. The purpose of cutting the bottom facet is to protect the tip of the pavilion.
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The culet is the smallest facet of all the facets in a diamond and has less effect on the diamond's brilliance. However, if the bottom facet is too large, all the light incident on the bottom facet from the front will leak out of the diamond, and it will appear as a small dark window when viewed from the front, which will have a negative impact on the appearance. The purpose of cutting the bottom facet is to protect the tip of the pavilion.
The modern method of cutting diamonds is to not cut the culet but to leave a point culet. The dotted culet is easily damaged, forming a small white break, which is also very bad for the diamond. Therefore, it is reasonable to reserve a bottom facet of a suitable size. The bottom facet must achieve the purpose of not affecting the appearance and protecting the tip of the pavilion. This bottom facet should be invisible or difficult to see with the naked eye.
When visually evaluating, the table top faces upwards, the line of sight is vertical to the table top, and the bottom surface can be divided into the following six grades according to the size.
(1) Spot shape: the absolute diameter is less than 0.04mm, and it appears as small white spots under a 10x magnifying glass, which is invisible to the naked eye.
(2) Very small: the absolute diameter is less than 0.12mm, the outline is difficult to distinguish under a 10x magnifying glass, and it is invisible to the naked eye.
(3) Small: The absolute diameter is within 0.13~0.18mm, and the octagonal outline can be seen under a 10x magnifying glass, but invisible to the naked eye.
(4) Medium: The absolute diameter is within 0.19~0.24mm, and the octagonal facets can be seen under a 10x magnifying glass, which can be seen with the naked eye.
(5) Large: The absolute diameter ranges from 0.25 to 0.38mm, and the small surface of the bottom is obvious under a 10x magnifying glass, and an octagon can be seen with the naked eye.
(6) Very large: the absolute diameter is greater than 0.38mm, the bottom surface is obvious under a 10x magnifying glass, and the octagon is easy to see with the naked eye.
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