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The 'Virtual'

Festival of Geology 2020

Saturday 7th and Sunday 8th November 2020

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COLLECTION OF SYNTHETIC RUBIES AND SAPPHIRES

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COLLECTION OF SYNTHETIC RUBIES AND SAPPHIRES
 
Red, yellow and blue varieties of corundum created artificially

Ruby and sapphire are both varieties of the mineral corundum. Red corundum is called ruby, while all other colours of gem-quality corundum, including yellow and colourless, are called sapphire.

  

In 1902, the French chemist Auguste Verneuil invented the first commercially viable process for the manufacture of synthetic gemstones. Known as the Verneuil process, it remains in use today as an inexpensive means of making artificial rubies and sapphires.

  

The process involves melting a finely powdered substance and crystallising the melted droplets into a cylindrical shape known as a boule. Depending on the desired colouration, small quantities of various oxides are added.  Although created artificially, inside the boule is the natural crystal structure of corundum. It is almost chemically and physically identical to natural crystals and strong magnification is required to distinguish between the two.

 

This collection consists of boules of blue, red and yellow corundum. Two of them are half boules and one is a cut section. They are presented in a plastic display box. Boules are sometimes split in half to relieve strain.
 
Click on a picture for a larger image


Size: 8 x 5.5 x 2 centimetres (size of box)
Weight: 65 grams (including box)

PRICE: £38.00
Sorry, this item has been sold or is out of stock