This necklace is made with genuine Hokutolite sourced from Taiwan and meticulously crafted by a professional, first-class licensed jewelry artisan. Taiwanese High-Purity Hokutolite Necklace Negative Ions, Natural Radium Approximately 15.2g (The sticker will be removed before shipping) Negative Ion Count: Approximately 5000 Radium Level: Approximately 0.25μSv/h Extremely high readings may indicate a fake, which could be dangerous and harmful to the human body. Our Hokutolite is from before mining was prohibited and is available only while supplies last. Genuine Hokutolite is extremely rare and is said to be beneficial for health, including cancer prevention.