Add articles to your saved list and come back to them any time. Washington: To put it mildly, this is one gem of a gem. Scientists using two different age-determining techniques have shown that a tiny ...

A zircon gem found on an Australian sheep farm is thought to be the oldest piece of earth ever found. Photo / Thinkstock A gem found on a sheep ranch in Australia has been found to have formed 4.4 ...

To put it mildly, this is one gem of a gem. Scientists using two different age-determining techniques have shown that a tiny zircon crystal found on a sheep ranch in western Australia is the oldest ...