① .table-board: Must be a regular octagon whose diameter of the circumscribed circle is 50-60% of the particle size.
Common quality defects: Countertops are large, small, octave uneven, sculpted surfaces, uneven surfaces (trailer).
②.Crown:All slots must be a point connection.
Common quality defects：Non-point connection caused by polygons, sharpening, crown waist, crown waist, uneven layout。
③.Waistline：Generally, it is a uniform 0.1-0.2mm
Common quality defects：Waist line uneven, shovel edge, thick edge, thin edge
④.Top：All plates must be connected to the point, the tip must be in the center of the table
Common quality defects：Crooked point, flower point, broken point, impact waist, hanging waist
Brightness (polishing)：Discriminated by the naked eye, the gemstones are transparent and the fire is stronger.
Common quality defects：Sand eyes, scratches, incomplete polishing, rolling rod, broken edge (line hair white), line, damage, etc
Primary Standard (AAA)：
(a) Not sharp, round, or sharp;(b) Wireless strips, no blisters, good brightness;
(c) Good layout, moderate table size, approximately 53-57% of grain diameter
Secondary Standard (AA):
(a) No obvious tip, no roundness, no large flower tip
(b) No blisters, no large lines, photometric
(c) The layout structure can be, the size of the table is about 50-60% of the diameter of the pellets
Level 3 standard (A):
(a) No large tip, almost no roundness, with flower tip
(b) Non-plated, non-polished, photometric
(c) No big Mongolian, no cracking stone
Level Four (AB):
(a) No big tip, no big round, no obvious shovel edge
(b) Large flower tip, damaged wiring, and poor brightness
Large Mongolian, large cracks, lack of edges, there is no polishing version
PS: All the finished products are hand-selected, and the boundaries between the gems at all levels are also relatively vague, so there will be a very small amount of stones in the goods. It is a normal phenomenon, please understand.