Until the 18th century, the amethyst was considered a fine jewel—loved by royals and known to be a favorite of Russia’s Catherine the Great. Now thanks to greater supply it’s been downgraded to semi-precious stone status, but in oversized stunners like this 18-carat antique ring, it still packs quite a punch. And for all of you February birthdays looking to do some serious celebrating in your birthstone, take note: the amethyst, which gets its name from the Ancient Greek methustos, meaning intoxicated, was once believed to protect its owner from drunkenness.