Materials that were scarce at that time were precious in ancient times, such as enamel. At that time, when it flowed into China, if it could not be made, our production technology would be very precious. This is not the case now.

Like agate, a large number of mines have been discovered in Northeast China. I feel that agate is not very valuable, but it is still very precious in ancient times.

There are some pictures in the resource, which the landlord can look at.

Ancient precious jewelry, good jadeite and hetian jade, pearls, ivory, tortoiseshell, red coral, red sapphire, are all here.