The Definitive Guide to 介指
鑽石分為一型和二型兩種,這主要是根據它是否含有N元素:一型含;二型不含。而藍色的鑽石是二B型的,是半導體。In 1999, we revolutionized the whole process of shopping for an engagement ring by making it straightforward to search out the proper ring on the net.Screening units based on diamond sort detecti