Pistachio nuts are red or crimson, because red indicates that pistachios are fully mature and have the best taste and taste. The rarity of bergamot stems from its special growth conditions and relatively short maturity. Growth needs specific climate and soil conditions, the maturity is short, and the yield of bergamot is relatively small. The bright appearance of bergamot also makes it attract much attention in the market, which increases its rarity and preciousness. Pistachios show their colors, such as yellow, orange or purple, but red pistachios are widely regarded as the rarest color because of their unique appearance and quality.