There are four criteria for evaluating the quality of pearls: รูปร่าง, ขนาด, luster and color. The shape of the pearl is of course the rounder the better; the larger the size, ดีกว่า. When the pearl weighs more than ten carats (ยิ่งกว่า 2 กรัม) and is round again, it is a rare treasure! ที่ […]
