The naked eye identification is the basis of the identification of jewellery and jade . Through the naked eye identification, there is a preliminary confirmation of the characterization of the sample, and then the effective identification instrument is used for detection and verification from simple to complex. The contents of the naked eye observation mainly include the following aspects. First, the color 1. Observation method The color should be observed under a white background, using daylight or equivalent light (the most uniform light mixed with various wavelengths), using top light (reflected light) illumination to judge the color, not using transmitted light. . 2. Description The color of the gemstone can be divided into two types: monochromatic gemstone and multi-color gemstone according to the purity of the color. The description of the color of the gem is not only to describe the color of the gemstone color, but also to describe the color, shade, and uniformity of the gemstone color. Monochrome gemstones with a single spectral color can be directly described, such as red, light blue, and so on. For complex color gems whose spectral colors are not pure, they should be described in terms of primary and secondary colors: the second is in the front and the main is in the back. If a green gemstone is slightly yellow, it should be described as yellow-green. If it is light in color, it should be described as light yellow-green. In addition, when the visible pleochroism is visible to the naked eye, it should also be described under the color term. The description of the color of the gem also includes a description of the gemstone and the ribbon, and the description of the stain and the ribbon includes its distribution position, shape, size, width and depth. Second, transparency Under transmitted light, the observed gemstones are classified according to different conditions such as transparency, translucency, micro-transparency and opacity. Third, luster Observe the luster of the gemstone with reflected light and indicate the type of gloss. Such as glass luster, grease luster, silk luster and so on. Fourth, dispersion A few gems have strong dispersion, such as diamonds, and the fire of diamonds is an important feature of diamonds. Five, special optical effects In general, the top optical (reflected light) is used to observe the special optical effects of the gemstone, and in some cases, the light can be observed. For white, light or colorless, nearly transparent gemstones, they can be viewed on a dark opaque substrate with special optical effects. Sixth, ghosting Under the naked eye or under a magnifying glass of 10 times, observe whether the ribs intersecting the facets of the gemstones have a ghost image. Some gemstones such as tourmaline and zircon can see obvious ghost images. Seven, inclusions Observe the presence or absence of inclusions, inclusion size, type and distribution characteristics inside the gem with the naked eye or under a magnifying glass of 10 times. , Eight, ç¢ type ç¢ type refers to the basic form or style of gemstone. The common types of defects are as follows. 1. Faceted type The surface of a gemstone is composed of a polished plane. Transparent and good gemstones are ground into a faceted type. 2. The curved surface type (primary surface type) has a convex curved surface or a concave curved surface. The gemstone is multi-grinded into a curved surface. Such as (1) single type: curved top and flat bottom; (2) double type: curved top and bottom. 3. Bead type According to its morphological characteristics, it can be further divided into a bead type, an elliptical bead type, an oblate bead type, a waist drum type, a cylindrical bead type and the like. 4. Shaped This type includes both free and random types, which are characterized by an asymmetrical or irregular shape according to people's favorite or original stone shape. Such as (1) embossing: all of the waist circumference is engraved into a pattern; (2) intaglio: all below the waist is engraved into a pattern; (3) stamp type: a flat body with parallel surfaces. The description of the gemstone type should be as simple and clear as possible, and should be described in the order of the small class in the former class, such as the elliptical faceted type and the heart type curved face type. The description of the jade carving type can be described according to the shape of its carved characters, animals and plants and the landscape, such as Guanyin (Jade carving) and cabbage in the jade (Jade carving). The description of the original stone form may depend on its specific external shape, such as: hexagonal column (beryl), octahedron (spinel). Nine, processing quality Observe the size, proportion and polishing of the surface angle of the gemstone processing. Ten, split stone When observing the finished gemstones (such as the ring face), you should pay attention to whether the crown, pavilion and waist are different in terms of gloss, color and inclusions to determine whether it is a combination stone. XI. Identification faults and cleavage Use the overhead light to reflect the surface of the gemstone, especially the vulnerable parts, such as the waist and bottom of the gemstone. The cleavage at the break and the gloss of the fracture are sometimes critical identification features. Sheet Set,Sheet Sets,Bed Sheets,Bed Sheet Set Changxing Xingang Textile Co.,Ltd , https://www.xingangtextile.com