Try the 'Fog Test' (or 'Breath Test'): Since diamonds are efficient heat conductors, once you breathe on a real diamond the fog should disperse immediately. If the stone is a fake diamond the top will stay foggy for a few seconds longer. This test works best with a clean stone.
The most notable use of Diamonds is in the jewelry market. Due to the brilliance, hardness, and rarity of Diamond, it is the most famous of all gemstones. Colorless Diamonds are most often used in jewelry, although recently yellow and brown gems have picked up in popularity.
The popularity of diamond-eating suggests internal organs are an optimal hiding place for stolen hardware. But what happens to your innards when you swallow a diamond? As one of the hardest materials on Earth, there's little risk of diamonds decomposing inside your body, but can they hurt you in some other way?Sep 5, 2012
(it seems like a diamond is somewhat stronger…) Actually Titanium is not stronger nor harder than a good grade steel, the only advantage it has over steel is the fact it is a much lighter metal with similar to steel qualities. Though it doesn't even come close to a Diamond in strength or hardness.