STAR RUBY : The most striking phenomenon of Rubies is the development of the six-ray star, arranged in a perfect symmetry, which shifts its centre as the stone is moved. It is clearly visible in a single light source. The star with its distinctive mobility is characteristic.

Appearance : The ground colour can be Ruby- Red in which case it is known as star-ruby, but it can also be blue-gray, smoke-gray or blackish.

Occurrence : Their occurrences are in Burma, Sri Lanka and Australia.

Substitute : Milky Quartz, Synthetic Corundum are its most common substitutes.

Chemical Composition : ALUMINIUM OXIDE with fine needles of TITANIUM OXIDE.