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 直径

测量距离之间两种对立点沿肩带的大纲。 最低及最高肩带直径有决心采取了若干直径测量。 直径报至最接近的百分之一毫米（ 0.01毫米）

。

平均直径是用于计算某一百分比，如表的大小，总深度，树冠高度，及展馆的深度。

平均直径= （闵直径+最大直径） ÷ 2条

>原文:
Diameter
Distance measured between two opposing points along the girdle's outline. The minimum and maximum girdle diameters are

determined by taking a number of diameter measurements. Diameter is reported to the nearest hundredth of a millimeter (0.01

mm).

Average diameter is used in calculating certain percentages such as table size, total depth, crown height, and pavilion

depth.

Average diameter = (min diameter + max diameter) ÷ 2

总深度％ 


总深度（即从表中平原culet ）相对一般直径报至最接近0.1个百分点（ 0.1 ％ ） 。

总深度％ = （总深度÷平均额直径） × 100
>原文:
Total Depth %
Total depth (measured from table plain to culet) relative to the average diameter reported to the nearest tenth of a

percentage point (0.1%).

Total depth % = (total depth ÷ avg diameter) x 100

表％ = （平均额表大小÷平均额直径） × 100
>原文:
Table Size %
Avg table size relative to the avg diameter, reported to the nearest whole percentage point (1%). Table size is measured from

bezel point to bezel point; the average of four measurements is used.

Table % = (avg table size ÷ avg diameter) x 100

冠角 

>原文:
Crown Angle
Average of all eight crown angles, reported to the nearest half of a degree (0.5°). A crown angle is the angle of the bezel

facet plane relative to the table plane.

height is measured from the table plane to the intersection of the bezel facet with the girdle.

Crown height % = (avg crown height ÷ avg diameter) x 100

the angle of the main facet plane relative to the table plane.

亭部深度％ = （平均额亭深入÷平均额直径） × 100
>原文:
Pavilion Depth %
Average pavilion depth relative to the average diameter, reported to the nearest half of a percentage point (0.5%). Pavilion

depth is measured from the culet to the intersection of the pavilion main facet with the girdle.

Pavilion depth % = (avg pavilion depth ÷ avg diameter) x 100

近的5 ％ （百分之五） 。
>原文:
Star Length %
The horizontally projected distance from the point of the star facet to the edge of the table, relative to the distance

between the table edge and the girdle edge. This is averaged for all 8 star facets and reported to the nearest five percent

(5%).

下半长％ 

面，并报告了以最接近的5 ％ （百分之五） 。
>原文:
Lower-Half Length %
The horizontally projected distance from the point where two pavilion mains meet to the closest edge of the girdle, relative

to the distance between the girdle edge and the center of the culet. This is averaged for all 8 lower-half facets and

reported to the nearest five percent (5%).

） 。 说明包括极薄的，非常薄，瘦，中等，略厚，厚，很厚的，也是极厚。 "非常薄" ，似乎是作为一个刀口;那就是，官方会见展览馆无肩

带在这两者之间。
>原文:
Girdle Thickness (verbal description)
Described and reported by the GIA Laboratory as a range from the thinnest to the thickest "valley" areas (i.e., "thin places"

located between the bezel-main intersection and where the upper and lower halves meet). Descriptions include extremely thin,

very thin, thin, medium, slightly thick, thick, very thick, and extremely thick. "Extremely thin" appears as a knife-edge;

that is, the crown meets the pavilion with no girdle in between.

大。 "无"是用来当没有culet面，这是有时被称为由贸易作为一种指出culet 。
>原文:
Culet Size (verbal description)
Described and reported by the GIA Laboratory as the average width of the culet relative to the average diameter of the

girdle. Descriptions include none, very small, small, medium, slightly large, large, very large, and extremely large. "None"

is used when there is no culet facet, which is sometimes referred to by the trade as a pointed culet.