Titanium is the 22nd element of the periodic table, its symbol is Ti. Titanium is a naturally grey metal, darker than silver. It is a very interesting metal with unique properties. 

Titanium is very strong, lightweight and extremely resistant to corrosion. It doesn't react with air and water (even sea water) as most of the other metals do.

It doesn't react with body fluids either. Basically, it is one of the rare biocompatible metals, that's why titanium is commonly used for surgical applications, for example, to build prosthesis or posts to repair broken bones. 

For jewelry making, even precious metals such as gold or silver usually contain a small amount of added other metals (copper, palladium...). This small amount of added metals is necessary to make them strong enough and sometimes to give them a specific color.

Titanium is very strong, a lot more than gold or silver so that it can be used without being alloyed with any other metals. As titanium doesn't react with body fluids, it's an ideal metal for jewelry, especially for sensitive ears. If you have sensitive skin, titanium jewelry is for you! 

The titanium I use for my jewelry pieces is pure (surgical grade titanium - grade 1), so the best that can be found on the market. Your ears should be happy with them :)

titanium bar
By Alchemist-hp (pse-mendelejew.de) - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=7329436