1. The color of the pearl is divided into white, red, yellow, black and other five series, each series includes a variety of body color. Such as:
White series: pure white, milk white, silver white, porcelain white, etc.;
Red series: pink, light rose, lavender, etc.;
Yellow series: light yellow, beige, gold, orange, etc.;
Black series: black, blue black, gray black, brown black, purple black, brown black, iron gray, etc.;
Others: purple, brown, cyan, blue, brown, purple, green, light blue, green, bronze, etc. Pearls may have associated colors such as white, pink, rose, silver or green.
Pearls may have a faint color, and the halo is divided into a halo, a halo, and a faint.
Color description: mainly based on body color description, supplemented by color and halo description.
2. Size
The size and value of pearls are closely related. Generally speaking, the bigger the more expensive, the larger the pearls of large particles, generally with small particles. In ancient China, there was the saying of "seven-pointed beads and eight-pointed treasures."
That is to say, the pearl reaches an eight-point weight, that is, a round bead with a diameter of about 9 mm is a treasure. PCT Ф = 2~5mm is usually less than 5mm Ф Ф = 5 ~ 5.5mm Ф Ф = 5.5 ~ 7mm large beads 7 = 7 ~ 7.5mm extra large Ф = 7.5 ~ 8mm super extra large Ф Ф > 8mm or more
3. Shape level
The shape of the pearl refers to the outer shape of the pearl. The formation of pearls is influenced by many factors. The shape is mainly spherical, and there are irregular shaped beads. These designs can achieve unexpected aesthetic effects and artistic value if they are cleverly designed and applied.
The national standard for cultured pearls in China divides the shape of pearls into: round, round, near-circle, ellipse, flat, and shaped.
4. Gloss level
Glossiness is one of the most important factors consumers should consider, determined by the quality of the pearl itself, its transparency and the thickness of the mother-of-pearl layer. Sometimes a circle at the waist of the pearl appears pale and dull, which is related to the structural changes of the local crystal, and should be avoided as much as possible. There is no doubt that the stronger the gloss, the better the quality. Pearl luster is generally divided into four grades: extremely strong, strong, medium and weak.
5. Bead quality (smoothness)
After comparison with standard samples, it is possible to have the following ambiguities:
6. Bead thickness level
Current detection methods include X-ray photography, OCT optical coherence chromatography, bead thickness detection methods, and direct measurement methods. The thickness of the bead layer is divided into five levels: extra thick, thick, medium, thin and extremely thin.
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