Basic knowledge can help everyone buy jade in daily life

Jade properties: When distinguishing jade raw materials and finished products, pay attention to the mottled porphyroblastic interwoven structure on its polished surface. Two forms of jadeite can usually be seen on a piece of jade, one is the granular porphyroblastic crystals with slightly larger grains, and the other is the fibrous crystals interwoven around the porphyroblasts. Generally speaking, the size of the porphyry crystals in the same piece of jade is uniform, which is the best quality.

Stone flowers: In a piece of jade, it is common to see small clumps of white fibrous crystals with slightly different transparency intertwined together, which are called stone flowers. Some of these stone flowers and porphyry crystals are transparent, while others are slightly transparent to opaque. Transparent is the best quality, slightly transparent is the second best, and opaque is the lowest quality.

Color: With different shades of green or dark green, black, etc. There are shades of green on the emerald background. Emerald is the best quality if it is completely transparent green, followed by transparent and light and dark porphyry, and translucent is second best.

Luster: Jade has bright and clear luster, fine polish, and soft strong glass luster. Jade has a high density and a strong refractive index; it sinks quickly in bromoform. Nephrite also has this characteristic, such as serpentine jade, prehnite, quartzite jade, etc., all of which are suspended or float in bromoform. The refractive index of jade is 1.66 and the hardness is between 6.7 and 7.4.

Inclusions: The black minerals in jade are mostly affected by melt synthesis. The edges of the particles are loose and cloudy, and the green color deepens around the black inclusions, which is why it is said that “green follows black”. The combination of minerals in jade and jade ingredients produces phenomena caused by changes in chemical substances. For people who wear jewelry with green-black porphyry crystal for a long time and in direct contact with the skin, the black color will change over time and vary from person to person.

Strong water-holding ability: refers to when you drop a drop of water on the surface of a finished jade product, the water drop will protrude higher, similar to a drop of water held in a lotus leaf or a dewdrop on the tip of grass. In short, the main identification features of jade are: uneven color, extended green; strong glass luster with oil; interwoven porphyroblastic structure; cool feeling, and color remains unchanged under the Charles microscope.

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