銘衡寶石有限公司 (Man Hung Gems Ltd.) - Member of HKGMA

明興寶石有限公司 (Ming Hing Gem Co. Ltd.) - Member of HKGMA

萬達寶石公司 (Mang Tat Gems Co.) - Member of HKGMA

玉恩寶石企業有限公司 (New Prosperity Gem Enterprise Co. Ltd.) - Member of HKGMA

盈藝珠寶工業有限公司 (Master Art Jewelry Industry Ltd.) - Member of HKGMA

OM Gem (HK) Ltd. - Member of HKGMA

美多源珠寶有限公司 (Mei Duo Yuan Jewelry Co. Ltd.) - Member of HKGMA

明泰寶石公司 (Opal Empire Gems Co.) - Member of HKGMA

美高寶石公司 (Michael Gems Co.) - Member of HKGMA

鄭明興閃山雲珠寶廠有限公司 (Opal House Ltd.) - Member of HKGMA