Extreme Diamonds

You won't find most of these diamond studded items at your local jewelry store. In fact, some of them aren't set into jewelry at all, like the platinum and diamond skull you see here, which was cast from the skull of a living, breathing male who lived about 300 years ago. Poor guy -- his grave must not have been very secure. The necklace made from Marie Antoinette's pearls is beautiful, and the $500,000 gold and diamond dog collar probably weighs more than my little dog.

_{Photo by Prudence Cuming Associates Ltd / Getty Images}