Six very practical tips for visually identifying gemstones

The gemstone identification method is based on the unique color, transparency, gloss, hardness, specific gravity, inclusion, dispersion, cleavage, fracture, birefringence, special optical effects, etc. of the gemstone, using simple tools such as 10 times more magnifying glass, poly Light flashlights, etc. were identified.

1. The first thing to watch when looking at color is to observe the color of the gem. Regardless of the gemstone, the scope of the appraisal is somewhat reduced depending on the color and hue of the gemstone. The special olive green color of olivine makes us see it as it is. A few gems are bright emeralds, such as emeralds, garnets and some dyed gems. Black gems are only wugang, coal, tourmaline, diopside, and black lava. Purple gemstones have amethyst, purple sapphire, spinel, cubic zirconia. In the identification of jade, Malaysian jade and green chalcedony, if you look closely, you can find that the green distribution of jadeite is uneven, the fracture is a dull jagged fracture, the color of Malaysian jade is distributed into filaments, and the fracture is glassy. And there is a sense of sand, the color of the green chalcedony is milky and evenly distributed. The color of the dyed jade is unnatural, and it is concentrated in the cracks. The true color of the jade is natural and the distribution is natural. The naked eye of ruby ​​and spinel is distinguished by how much ruby ​​is ruby ​​in the ruby, placed in the water, sometimes with a hexagonal ribbon, and the red spinel is absolutely uniform in color.

2. See transparency Transparency can be used to understand the pros and cons of gems. Generally speaking, the same kind of gem, the higher the transparency, the more precious it is. Transparency can also be used to identify gemstones of similar color but different types. For example, spinel and purple tooth are similar in color, but the spinel is transparent, and some purple teeth are opaque or translucent. The same is true for yellow and sapphire. Yellow sapphire is a transparent crystal, while sapphire has a transparent, translucent to opaque distinction. Peridot is a transparent crystal, while jasper, which is similar in color, is opaque.

3. Looking at the luster of glossy gemstones is an important visual basis for identification, and a satisfactory range of refraction can be roughly judged. The gloss is determined by the level of the refractive index and the smoothness of the polished surface. The stronger the gloss of the unknown gemstone, the higher the refractive index. The refractive index of the semi-gold shiny gemstone falls on the scale of the refractometer in the high refractive index range, and the refractive index of the gemstone with glass luster is in the range of è¹­, and half off work. Glossy gemstones have a lower refractive index. The polished surface of the jade with waxy, lustrous grease is relatively poor, and the silky luster indicates that the gem has many needle-like inclusions. The resin may have amber luster, and the curved surface has a color, translucent, cloud-like shape, and the sky-blue milky white is an ice long moonstone. The pearly luster is a sodium long moonstone, which is yellowish brown and has a blue luster that is elongated moonstone. The shining golden light in the sun is the sun stone. Diamonds have a typical diamond luster.

4. Observing the inclusions The characteristics of the inclusions in the transparent gemstones are observed with a 10x magnifying glass, which is the most reliable method for distinguishing between natural and artificial products. The inclusions of natural gemstones can be solid, liquid, gas, solids and many crystal forms; artificial gemstones mostly have bubbles, and spiral-shaped solid inclusions are inclusions of synthetic gemstones.

5. Look at the dispersion in the transparent faceted gemstone, the dispersion intensity can provide important clues for identification. Only diamonds, artificial cubic zirconia, zircon, rutile, garnet, cassiterite, etc. can be seen with the naked eye.

6. It is especially important to identify certain gemstones when looking at the fracture and the cleavage of the fracture and the surface of the fracture. Most of the gemstones with glass luster are shell-like fractures, and translucent and opaque jade are mostly granular and jagged fractures. For example, the fracture of the coral is dull and jagged; the fracture of amber is resin luster and shell-like fracture; the fracture of chalcedony and agate is resin gloss and shell-like fracture; turquoise is dull grease, grainy or shell-like fracture; The dense jade and the Dongling stone are granular and jagged.