(1) Curved surface type. Cabochon gems are also called plain or convex gemstones. The gemstone has a convex surface. According to the waist shape, it can be divided into: round, วงรี, olive, pear, heart, สี่เหลี่ยม, random, ฯลฯ. โดยทั่วไป, jade and jade, เป็นต้น, are commonly curved, especially the oval ring or pendant surface, because it is […]
