About 80 % of all ornaments of semi-precious gems in South Africa are produced by Chuang's Evergreen Gems, while Gem City is responsible for handling orders and all wholesale and retail operations. Together, the two companies constitute the biggest dealer in natural gemstone ornaments in South Africa.
現在，百分之八十的南非半寶石飾品是經由莊英漢的「永昌寶石廠」加工製成的，「寶石城珠寶公司」則負責接單、批發、零售等業務，是南非最大的天然寶石飾品中心。