Saturday, May 16, 2009

Where Gemstones are found

Some gem minerals, such as quartz and garnet are found world wide. Other, like dimonds and emeralds are rarer, due to the more unusual geological conditions necessary for their formation. The physical properties of gemstones, their hardness, theri specific gravity or density, and the way they break or cleave, depend on cemical bonding and the atomic structure within the stone.
Many kind of gems occur in more than one environment.

OPTICAL PROPERTIES:
Colour is the most obvious visual feature of a gem, it depends largely on the way it absorbs light. Each gem in fact has a unique colour "fingerprint".

MAY BIRTHSTONE - EMERALD
Emerald, the color of spring, derives it's beautiful green colour from the presence of chromium and vanadium. Emeralds are rarely flawless, so stones are often oiled to fill and disquise cracks, hide flaws and enhance colour.
Occurrence: Found in granites, pegmatites and schists, as well as alluvial deposits. The finest Emeralds are from Colombia. Other sources are Austria, India, Australia, Brazil, South Africa, Egypt, USA, Norway, Pakistan and Zimbabwe.
Most Emerald used in historical jewellery, would have been from Cleopatra's mines in Egypt, which now yield only poor quality Emeralds. The Egyptians were known to engrave Emeralds with the symbol of foliage to represent eternal youth and bury the jewelry with their dead.
The ancient Romans associated this gemstone with fertility and rebirth, and dedicted it to venus the goddess of love and beauty.
Some people beloeve that wearing an Emerald brings wisdom, growth and patience.

1 comments:

Yvette Kelly said...

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