Peridot is a very attractive greenish yellow to yellowish green gem. Due to its relatively high birefringence, peridot can display visible doubling.
Ancient Egyptians called peridot "the gem of the sun".
Some peridot dates as far back as 4.5 billion years ago, being found in pallasite meteorites. In 2005, peridot was found in comet dust retrieved by a robotic space probe.