Ruby is the red form of corundum. It ranges in colour from bluish red to yellowish red. The finest rubies are a vivid, pure red with a faint hint of blue. The star ruby is a translucent variety which produces a six-pointed star effect when cut as a cabochon (dome).
Ruby is the symbol of love and passion and was was believed to ensure true friendship.
Because the ruby is such a prized stone, synthetic versions have been produced; some of these are very close to natural rubies.