Ruby is a red gemstone a variety of the mineral corundum (aluminium oxide) in which the colour is caused mainly by chromium. Its name originates from ruber or rubrum Latin for red. Natural high-quality gem Rubies are exceptionally rare. They are most often found in Myanmar Sri Lanka Kenya and Thailand. Sapphire is the blue gem variety of the mineral corundum. Mentioned in the Bible the word Sapphire derives from the Hebrew word for the stone ‘Sapir’. Sapphire can be synthetically made for use in industry but gem-quality transparent Sapphire is still a rare and highly revered precious gemstone.