(1) Intuitive method: the method of direct observation with naked eyes. This is also the most common and actual identification method. The inspection can be carried out from the following four aspects: ①In terms of color, รูปร่าง, ขนาด, ความมันวาว, ฯลฯ. If it is a bead or a batch of pearls, for real pearls, พวกเขาเป็น [...]
