Japanese Gold Thread Imitation for Goldwork EmbroideryGold Threads Japanese Imitation Imitation Japanese Gold Threads are used in goldwork embroidery. Japanese Gold Threads are available in 4 different sizes: No. 13 is the largest gold thread > No. 8 is the smallest gold thread No. 13 (K1): Approximately 1 mm width across thread No. 12 (K2): Approximately 0. 85 mm width across thread No. 9 (K3): Approximately 0. 70 mm width across thread No. 8 (K4): Approximately 0. 5 mm width across thread Gold threads