1. A popular producing area with special flavor, strong representativeness and high price.

2. Oil content is high or low, and oil content is the most important basis for evaluating the oil-bearing year of Aquilaria sinensis. It is also the core foundation.

3. There are also popular or unpopular varieties, such as Runnan and Oil-stained Tiger. This kind of material is more pleasing.

4. The size of raw materials, the larger the raw materials, the larger the size of the beads with the same paragraph, and the higher the price increase, especially the submerged materials. For example, 18mm water droplets are many times more expensive than 10mm water droplets.

In addition, now that the era of literary play has passed, what I want to play is Hetian jade red skin, old pit jade and so on.