Notizie di gioielli

argento sterling all'ingrosso 925 Come scegliere correttamente i cristalli? (Sotto)

Pubblicato il da Kingjy

Tactile and refraction: Generalmente, natural crystals have a colder touch, and the hand feels different from glass or synthetic products. Artificial materials usually do not have a cold touch, which is also a simple method of identification. There is another way to apply to transparent crystal gems. If it is a larger crystal ball or sculpture, the company draws a thin line on white paper, presses the crystal on this line, and one can be seen through the crystal. The line becomes two lines, but it is still a thin line when seen through the glass. This is because the crystal is a birefringent gem, and the light passing through the gem will split into two refraction lines. But if it is a smaller crystal gem, this phenomenon is not obvious because the refractive index difference is too small.

Distinguish Soviet diamonds: The amethyst or citrine imitations currently on the market are not synthetic crystals, but purple or yellow zirconia from the Soviet diamonds. The specific gravity of the Soviet diamond (5.9) is nearly twice that of the crystal (2.66), so when both are held in your hand, the Soviet diamond is much heavier than a crystal gem of the same size.

Colore, carving and crystal shape: Because the crystal is cheap and good quality, even the crystal with high clarity and high carat number will not cause too much burden on the price. When buying crystal faceted gemstones, you should pay attention to the uniformity of the color. The color is rich and uniform and the quality is high; if it is a sculpture, the quality of the carving should be paid attention to; if it is the choice of geodes or crystal clusters, It is necessary to pay attention to whether the crystal form of the crystal is complete, and try not to break or wear the tip. The crystal of the crystal is a perfect hexagon, the natural crystal tip has one side larger, not all six sides are the same size, if the six sides are exactly the same, it may be the result of re-cutting, not the original natural The crystal face of it.

 

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