Sunstone necklace 【Hawaiian Jewelry】 【Metal allergy対応】OK to wear all the time 【Material】 Surgical stainless steel 316L Surgical stainless steel is less likely to scratch than other metals and is rust-resistant. It is also used in medical instruments, so it can be used with peace of mind by those with metal allergies. Since it doesn't rust, you can wear it in the ocean or the bath. Thank you for viewing.