T/JSAS 042-2023 Amethyst Products

Scope

Scope: This document specifies the requirements for amethyst products, product grading, inspection methods, inspection rules, and packaging and transportation requirements. This document applies to the production of natural amethyst products. It applies to monochrome natural amethyst. It does not apply to special inclusion-bearing natural amethyst or phantom natural amethyst grading. Main technical content: Products. 3.3 Amethyst inclusions Amethyst inclusions are common in amethyst, including gaseous inclusions, liquid inclusions, and solid inclusions. These inclusions, with their rich colors and diverse shapes, are a special type of crystal collection. 4 Physical and chemical properties of raw materials The physical and chemical properties of raw materials shall meet the requirements of Table 1. Table 1 Physical and chemical properties of raw materials Item Indicator Luster Glass luster Cleavage Density 2.66 (+0.03, -0.02) g/cm3 Optical characteristics Anisotropic, uniaxial, positive optics, may have "cow's eye" interference patterns. Amethyst often has Brazilian twins. Weak pleochroism, varying by color. Refractive index 1.544?1.553 Birefringence 0.009 Fluorescence observation Long-wave: none; short-wave: none UV-visible spectrum No characteristic Magnification inspection Color bands, liquid and gas-liquid two-phase inclusions, gas, liquid, and solid three-phase inclusions, needle-shaped rutile, tourmaline, and other inclusion minerals. Silica content % ≥ 99.99 Aluminum content mg/kg ≤ 15.0 Total impurities mg/kg ≤ 20.0 Note: Density, silica content, aluminum content, and total impurities apply to the crystal main body. 5 Product requirements 5.1 Necklaces 5.1.1 The bead diameter of amethyst necklaces is typically in the range of 3mm?16mm. 5.1.2 Amethyst necklaces come in round beads, faceted beads, round shapes, butterfly shapes, irregular shapes, free-form shapes, and drum shapes. The beads sho

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