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Sapphire Variety of the Mineral Corundum

 

six faceted blue sapphire gemstones

 

Sapphire Birthstone for the Month of September


The name sapphire comes from the Greek word 'sappheiros' meaning 'blue stone'.  It's generally believed that over many years this name was misused and originally referred to the stone known today as lapis lazuli.

The gemstones sapphire and ruby which are both varieties of the mineral corundum have an almost identical chemical composition.  The most obvious difference is their colour and whilst red corundum is known as ruby, all other colours are known as sapphire.  Although sapphires can be found in several different colours, pink and blue tend to be the most popular. 

Blue corundum is far more abundant than red due to the larger occurrence of chromium, iron, and titanium which is the cause of the colour.  Corundum which is the second hardest mineral known to man is a naturally occurring crystalline form of aluminium oxide which is a chemical compound of aluminium and oxygen.

Some sapphires can exhibit a star-like optical phenomenon known as asterism that's caused by the reflection of light from needle-like inclusions of the mineral rutile.  Rutile is made up primarily of titanium dioxide.  In order for asterism to be seen the sapphire must be cut and polished as a cabochon.

Many of the world's finest sapphires are heat treated in order to enhance colour and improve clarity.  The practice of heating stones is not new and can be traced back at least as far as Ancient Rome.  Stones which have not been heat treated are considered to be extremely unusual.  Although Sri Lanka and Madagascar are currently the world's largest exporters, sapphires can also be found in Myanmar (formerly Burma), Australia, Thailand, India, Pakistan, Afghanistan, Tanzania, Kenya and China.

 

 

line of faceted purple sapphire gemstones in various shades of purple

 

Sapphires in shades of purple

 

 

 

Famous Sapphires Around the World


The gemstone sapphire has been associated with royalty and nobility throughout history.  Princess Anne and Princess Diana both wore engagement rings that featured a blue sapphire.  The Stuart Sapphire and St Edward's Sapphire are another two famous stones both of which form part of the British Crown Jewels.  The Logan Sapphire one of the largest faceted gem-grade blue sapphires in existence is housed in the National Museum of Natural History in Washington D.C.

Other famous sapphires include the Black Star of Queensland which before the discovery of the Star of Adam was the largest star sapphire ever to have been mined.  The Star of Adam was found in Sri Lanka in 2015.  The name comes from the Muslim belief that Adam went to Sri Lanka after being expelled from the Garden of Eden.  It's believed he lived out his days on Adam's Peak which is a well known mountain not far from the city of Ratnapura.  The Star of India which was also mined in Sri Lanka is currently housed in the American Museum of Natural History in New York.

 

 

Sapphire Healing Properties


When used for its metaphysical properties sapphire improves concentration, mental clarity and helps focus the mind.  It has the ability to find solutions to problems and can remove mental tension bringing inner peace and serenity.

 

 

Our Collection of Rocks and Minerals

 

 

Read More

https://en.wikipedia.org/wiki/Sapphire

 

 

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