JGAB Digital Showroom Exhibitors | Products YU FENG JEWELRY CO LTD Country & Region: THAILAND Hall No.: EH2 Stand No.: H17 Category: Coloured Gemstones Bookmark exhibitor More about this exhibitor Visit website Round Black Sapphire Yu Feng Jewelry Co., Ltd. has round black sapphire stone, size 0.8 - 8.0 mm. Our black sapphire has many grades, grade AA, AAA, AAAA, AAAAA. Each grade of beautiful gemstone and the price varies.