Red rubies have long been regarded as the romantic gemstone, evoking love and passion in all its forms. The sanskrit name for ruby translates roughly as 'king of gemstones.' Ruby is in the same gemstone family as the sapphire, the corundum.These gems come in a range of colours but only red corundum stones can be called rubies. Rubies are capricorn's zodiac gemstone. Rubies are only slightly less durable than diamonds, commanding a high price per carat.