The hardness of jadeite is between 6.5 and 7. Drawing glass is easy.

The second is luster:

Jade has a glass luster. If the gloss is wrong, it is generally not in the soil, it is processed, or even passed off by other jade.

The third is emerald.

This is more professional. It's hard to understand in one sentence.

Let me put it this way. If you can find tiny particles, cracks, impurities, etc. In the beads of your necklace, it is usually true.