Gem jewelry such as diamonds, rubies, sapphires, tourmalines and topaz (topaz). These gems are hard and can withstand great pressure, but they also have the same shortcomings-they are brittle and cleavage for diamonds and topaz, so these gems can't stand knocking and knocking, otherwise they will collapse due to brittleness, or crack or even break along the cleavage direction due to cleavage. Remember, no matter how hard a diamond is, it can't stand the impact.

Emerald jewelry. Although jadeite is hard and tough, it has certain impact resistance. However, the processed jadeite products are often thin and will be damaged by impact.

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Emerald jewelry. Emerald is slightly harder than jade, but it is more brittle than jade, and it can't withstand impact and beating more than jade. In addition, emeralds are afraid of high temperature, which will make their colors fade in case of fire and easily burst at high temperature.

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Opal has low hardness, so it should avoid rubbing against other objects. Opal contains water and should be protected from high temperature. Otherwise, after losing water due to evaporation, it will lose transparency and burst. In addition, opal is not acid-resistant, so wear opal jewelry to avoid high temperature and acidic substances. When collecting opal jewelry, we should also pay attention to the environment not to be too dry, otherwise it will also cause dehydration cracking or even rupture. In order to prevent dehydration, in the dry season, opal jewelry should be soaked in water regularly.