Titanium necklace Made of high-purity material, pure titanium (TITANIUM). Titanium is as light and strong as aluminum, rust-resistant, and unlikely to cause metal allergies. It is also said that when exposed to ultraviolet light, active oxygen forms on the surface, which has the effect of killing bacteria. The herringbone design, which has been popular in Italy for a long time, is a sophisticated and impactful design that is made by rolling a cuban chain type necklace and closely adhering the gaps to create a wide width. It is a refined design that can be enjoyed by both men and women.