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For example, blue indicolite tourmaline is the only blue gemstone of any kind that will show a drag response when a neodymium magnet is applied. Any blue tourmaline that is diamagnetic can be identified as paraiba tourmaline colored by copper in contrast to magnetic blue tourmaline colored by iron.
Asterism on the surface of a blue star sapphire. A purple-pink star sapphire displaying asterism in a platinum ring.. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone.
They have a superior vivid blue hue, coupled with a mysterious and almost sleepy quality, described by some gem enthusiasts as ‘blue velvet”. Kashmir-origin contributes meaningfully to the value of a sapphire, and most corundum of Kashmir origin can be readily identified by its characteristic silky appearance and exceptional hue.
[27] [42] [102] Claims that the gem in the engagement ring of Lady Diana Spencer and Kate Middleton is a Yogo are dubious; the gem is thought to be of Sri Lankan origin. [103] The story that the gem is a Yogo can be traced to a 1984 Los Angeles Times article that described the ring as a 9-carat (1.8 g) sapphire, and quoted Intergem president ...
An alternative origin of the name derives from an old miners' name for the zinc ore sphalerite, which they called "Black Jack". Thus, the unique blue stone mined in these caverns could easily have become known as "Blue John". [1]: 7 Another derivation comes from the Cornish miners who began working the Derbyshire lead mines in the 1740s.
A larvikite quarry in Larvik, Norway, 2008 Polished larvikite (marketed as "Blue Pearl Granite"), showing labradorescence, is a popular decorative stone. Light larvikite with a polished surface Larvikite is an igneous rock , specifically a variety of monzonite , [ 1 ] notable for the presence of thumbnail-sized crystals of feldspar .
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Its history is older than any other gemstone in the Royal Collection. [1] The sapphire is thought to have been set in the coronation ring of King Edward , known later as St Edward the Confessor, who ascended the throne of England in 1042, twenty-four years before the Norman conquest .