Titanium is a popular choice for jewelry because it is strong, durable, lightweight, and hypoallergenic . Titanium has different grades that are standardized by ATSM International. The grades vary depending on the metal alloy and the amount of other elements like nitrogen, carbon, oxygen, iron, hydrogen, and palladium. The grades also differ in strength, ductility, weldability, formability, and corrosion resistance . We use grade 5, which is the strongest and most ductile. Some of the pros of using titanium for jewelry include: Durability: Titanium is strong and resistant to tarnishing, making it a good choice for jewelry that will last a lifetime with proper care . Hypoallergenic: Titanium is less likely to cause an allergic reaction, making it a good choice for people with metal allergies . Lightweight: Titanium jewelry is lightweight, making it comfortable to wear . One of the cons of using titanium for jewelry is that it cannot be resized once it has been formed .​