The quality of agarwood depends largely on the resin saturation within the wood and it involved other criteria such as discoloration, the fragrance level, analysis of its chemical composition, and how much oil is saturated within the wood.
To know the quality of agarwood will depend on the experience of the graders and traders themselves. It requires years of experience, experiment, and understanding about different agarwood products in the market to make a clear grade about agarwood, and this also dependable on the agarwood’s oil, color, it’s smell, and touch.