1. [emerald]

Emerald is slightly larger than the hardness of jade, but jade is brittle, so can't withstand the impact and break more than jade. In addition, emerald afraid of heat, to meet the fire will make color fade, easy cracking at high temperatures.

2. [opal]

Opal hardness is low, should try to avoid friction with other items. Opal contains water, should avoid high temperature, otherwise due to the evaporation loss of moisture, light, transparency, lost or crack. In addition, opal don't acid, so when wearing opal jewelry, should avoid high temperature and acid. Opal jewelry collection, also should pay attention to the environment cannot too dry, otherwise it will cause dehydration and cracks, and even rupture. In dry season, to prevent dehydration, every certain time appropriate to an opal jewelry in clean water.

3. [amethyst]

Amethyst color is not stable, in high temperature or long time exposure can cause discoloration. Wearing or collection process, should avoid hot or exposure.