This is the grade sold for over 300,000 to 400,000 yen at high-end natural stone shops. It's a completely natural, extremely rare, hand-polished, super-transparent stibnite. Each bead was hand-shaped by a craftsman in Nagano, who carved and polished them one by one. If necessary, please obtain your own certificate of authenticity. I guarantee it's genuine. Wrist size: Approximately 17-17.5cm Bead size: 10.1mm or more - 10.9mm This is a rare grade that remains super transparent even in sunlight. Furthermore, a hand-polished 10mm bead of this grade is extremely rare. Material: Natural stone Bracelet/Bangle: Bracelet Color: Silver系 (Silver-toned)