Natural bergamot will show a yellowish brown appearance when it matures. This color is the result of the natural growth and maturity of bergamot, and it is also one of the characteristics in its natural state.

Yellow-brown bergamot usually has a more uniform and natural appearance. After artificial polishing, the surface of pistachios will become brighter and look more oily. This treatment can increase the luster and attractiveness of the Buddha's heart fruit and make it more attractive.