There are 3 major grades of titanium used to manufacture bands, rings and other jewelry.

Titanium 6/4 - aircraft grade titanium
Titanium 6/4 (Ti-6/4) consists of 90% titanium, 6% aluminum and 4% vanadium. It is much harder than basic grade (CP) titanium, not to mention other jewelry metals. Aircraft grade titanium will also resist wearing to a much greater extent.

Titanium 6/6/2 - extra-hard titanium
Titanium 6/6/2 (Ti-6/6/2) consists of 86% titanium, 6% aluminum, 6% vanadium and 2% tin. This is the strongest titanium alloy on the jewelry market. It is 130% stronger than Ti-6/4, making it the best choice for tension set titanium rings. Extra-hard titanium offers the highest resistance to denting and bending.

This grade of titanium is very difficult to work with and not many jewelers offer it as an option for rings.

Commercial pure titanium, grade 4
Although softer than Aircraft Grade titanium, commercial pure titanium (CP), grade 4 is nevertheless much superior strengthwise to traditional jewelry metals such as gold, silver, and platinum. CP titanium is often used in rings that have diamonds or gemstones flush set into the titanium.

Titanium jewelry makes a great wedding anniversary, birthday or holiday gift for your loved one.

Check out the links above if you are interested in buying titanium jewelry