1. The color of sapphire is an indicator of its value. A very dark gemstone may only sell for one hundred dollar one card, but a good car gerber blue gem will sell tens of thousands of Hong Kong dollars per card. In the United States and Europe, people prefer darker sapphires. In Hong Kong, consumers love medium-depth blue, and the color of this sapphire is higher. Put the Sapphire on your arm and carefully observe whether it is blue or black. If it's blue, then your choices are not too far away.
2. Look at gems under natural daylight and artificial light sources. Gemstones appear to be lighter in glare, but they are "blacker" in normal daylight.
3. See if the color is uniform and the crack will affect the beauty and durability of the stone. If the plume stretches to the surface of the stone, sudden impacts (such as when the sparrows are licking) can cause the gems to rupture.
4. Don't forget to observe the cut and proportion of the gemstone.
5. Like rubies, be careful with imitations and a few fake pieces.
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