Ruby

Composition: Al2O3
crystal System: Trigonal
Habit: Tabular prisms with hexagonal outline.
Refractive Index:  1.76 - 1.77
Double Refraction and Optic Sign: 0.008, Negative
Dispersion: Low (0.018)
Specific Gravity: 3.99
Hardness:  9
Cleavage: Poor, parting parallel to the basal and rhombohedral planes due to lammellar twinning.
Fracture: Conchoidal to uneven.
Lustre: Viterous to sub-adamantine.
Pleochroism:  Strong. deep red, orange-red.
Absorption Spectrum: Doublet in the deep red with two further lines in the red, a broad absorbtion band centred at 550nm
Inclusions: Vary widely with occurrence ....
Occurrence: Myanmar (Burma) Afghanistan, Cambodia, Kenya, Pakistan,  Sri Lanka, Tanzania, Thailand.

Ruby comes from the Latin word "Rubeus" which means red, with it's deep red colour it has come to represent Love, Passion, Sexual Desire and Power.
Ruby the gemstone for the month of July, are the red variety of the mineral Corundum, with all other colours being Sapphires, The red of Ruby is brought about by the inclusion of a small number Chromium atoms in the crystal lattice. Mayanmar formally known as Burma is the best known source for fine quality Rubies. Rubies of the most exceptional colour often named "pigeon's blood" or also called Burmese Rubies regadless of their origin, display the most desirable shade of red, which is blood red with a hint of blue.
Medical litrature from India around the 13th century say that a Ruby can cure digestive disorders, other ancient cultures believe that Rubies brought peace and prosperity, so if you wore a Ruby it would bring health, wealth, wisdom and love. Some even believe that if you wore a Ruby on the left then you would have a magical ability to live amongst your enimies in peace.

John Cadby Jewellers
 Goldsmith, Silversmith,
Diamond Merchants, Appraiser & Engraver.
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3, White Hart Yard, Trowbridge, Wiltshire.  BA14 8BY
Tel: 01225 776322  E-Mail: John@Cadby.co.uk

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