The ancient pearls of Hepu identify the grades of pearls , which are classified according to the weight of pearls: 800 pearls weighing one or two are called "eight hundred children"; one thousand pearls are exactly one or two, called "Zhengqian"; Pearl, a heavy seven-point, is called "seven treasures"; a heavy eight-point, known as "eight treasures."
According to the shape, quality, size and luster of the pearl, it is divided into four products: the pearl is spherical or semi-spherical, the diameter is more than 1 cm, the surface is jade white, the whole pearl is smooth and smooth, and the sparkling pearl is the first grade; the pearl is a ball. Or semi-circular ball, oblong shape, waist drum shape, its size is not divided, the color is second to second, the surface is jade white, light pink, light yellow, the whole bead is smooth and smooth, shining pearl light, is the second-class product; pearl shape It is spherical, nearly spherical, oblong, waist-shaped, flat-shaped, rod-shaped, etc. The surface is jade white, light pink, light yellow, smooth all-beads, fine wrinkles and pearls, which are third-class products; The shape of the pearl is irregular, the surface is jade white, pink, light yellow, light orange, with obvious wrinkles or grooves. The whole pearl is basically pearlescent, but the pearl surface is not less than 80% of the total surface area of ​​the whole bead.
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