Titanium

With its silver-greyish color, titanium is very strong (much stronger than platinum, gold and silver). Although Titanium is the hardest natural metal, it is also very lightweight. It is hypoallergenic, so anyone can safely wear it. Popularity for Titanium wedding bands is increasing; however, Titanium rings cannot be resized.

Tungsten Carbide

Tungsten is a very hard and dense metal. While extremely strong and scratch-resistant, Tungsten carbide is a bit more brittle than traditional metals used in wedding bands. It is hypoallergenic and will not oxidize or irritate the skin. Popularity for Tungten rings is increasing, but one thing to consider is that Tungsten rings cannot be resized.