Cleopatra was so taken with these stones that she claimed the mines for herself. In fact, she was known for wearing lots of huge emerald jewelry, and gave emeralds carved with her portrait to her important visitors.
Agates are primarily formed within volcanic and metamorphic rocks.
If you were born in May, your birthstone is the emerald, a type of beryl colored green by chromium. Perfect emeralds are among the rarest of gemstones.