1. The larger the diameter of millet beads, the more complicated the manufacturing process. Compared with 2-3mm millet beads, 3-5mm millet beads need longer time and more nutrition to cultivate. This leads to the increase of production cost, which makes the price of 3-5mm millet beads higher.

2. With the increase of the diameter of millet beads, the quality requirements will be improved accordingly. In the jewelry industry, quality is one of the important factors that determine the price. Compared with 2-3mm millet beads, 3-5mm millet beads require higher quality, because they need more perfect luster, cleanliness and cutting technology. The price of these high-quality millet beads will naturally be higher.