Shape rules: quality requirements (diameter difference %),Pearls perfect circle A1 ≤1, circle A2 ≤5, near circle A3 ≤10, ellipse B >10 can have drop shape, pear shape, flat C with symmetry,Pearls one side or The two sides are almost flat. The less acne, spots, marks, pits, and spots on the surface, the better. Generally, Pearls it is an acceptable standard to see no defects at a distance of 0.5 meters. The standard for Class A is 100% smooth surface,Pearls and no defects can be seen with the naked eye. Of course,Pearls the flaws that are hard to see with the magnifying glass are the best among the best in the world.
Seawater cultured pearl finish level: finish level,Pearls quality requirements: Flawless A The surface is smooth and delicate to the naked eye,Pearls and it is extremely difficult to observe defects on the surface; Micro-B has very few defects on the surface, like needles,Pearls which are difficult to observe with the naked eye; small C has small flaws, which are easy to see with the naked eye;Pearls Defect D is obvious and takes up less than one-quarter of the surface area; Serious E is very obvious and takes up more than one-fourth of the surface area;Pearls the so-called "seven points" "Pearls,Pearls eight points are treasures". Generally, pearls below 6 mm are not included in the category of jewelry-grade pearls. 7-9 mm are popular among consumers. 10 mm pearls are rare. Only 11 mm and above are only South Sea pearls. With Black Pearl. The higher the number,Pearls the scarcer the quantity,Pearls and the price tends to increase exponentially. This standard is not difficult to see.
