1 About Gemstone – Gems stone
Pink Color Tourmaline Specimen

Pink Color Tourmaline Specimen

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Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

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Tourmaline Cuts Shapes

Tourmaline Cuts Shapes

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watermelon Tourmaline

watermelon Tourmaline

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Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

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Category Archives: About Gemstone

About Gems

GARNET

PYROPE

 

COLOUR : Dark red to rust red ,yellow,green ,blue

COMPOSITION :[SiO4]3+Ca,Fe,AI,Cr,Mg,Mn

CRYSTAL STRUCTURE : Cubic

HARDNESS :7-7.5specific gravity :3.6

LUSTER:Subadamantine to resinous

TRANSPARENCY : Transparent to translucent

METAPHYSICAL :Enlightenment ,wisdom,vitality,memory,constructiveness,hope,joy,willpower,imagination,energy

OTHER:Said to bring light to dark souls ;common decoration for weaponry

 

The blood –red colour of pyrope is due to its iron and chromium content .It rarely has inclusion ,but when present they are rounded crystals or have irregular outlines. As with all garnets,pyrope has no cleavage ,and fracture is subconchoidal to uneven .

OCCURRENCE : pyrope is found in volcanic rock and alluvia deposits, and may along with certain other minerals, indicate the presence of diamond –bearing rocks,Localities include Arizona (USA) ,South Africa ,Argentina ,Australia ,Brazil ,Burma,Scotland ,Switzerland ,and Tanzania .

REMARK: Pyrope comes from the Greek pyropos, Swiss and South Africa pyrope are lighter red then stones from Bohema ,where pyrope jewellerey has been made for over 500 years.

 

SPESSARTINE 

Gem-quality spessartine is uncommon .It is bright orange when pure ,but an increase in the iron content makes the stone darker orange to red .Inclusion are lace –or feather –like

OCCURRENCE:Spessartine occur in granitic pegmatities and alluvial deposits .It is found in Srilanka ,Madagascar ,Brazil ,Sweden ,Australia ,Burma,and the USA;also Germany and Itly , but crystals there are too small to facet .

REMARK: Spessartine in named after the spessart district of Bavaria Germany .It can be confused with hessonite garnet or yellow topaz ,but on close examination of inclusions it is distinguishable.

Where Gemstone are Found

WHERE GEMSTONES ARE FOUND

Some gem minerals such as quartz and garnet are found worldwide others like diamonds and emeralds are rarer due to the more unusual geological condition necessary for their formatio

n even when a mineral is found worldwide only a minute proportion may be of gem quality the main gem localities of the world are therefore those where gem quality material occurs in sufficient quantity to make production economic.
DIAMONDS OF AFRICA and Asia
The kimberlite rocks of southern Africa are mined in a modern large scale way producing vast quantities of diamonds for both industrial and gem use .
TWELVE KEY GEMS
The 12 varieties of gemstone shown on this map represent some of the worlds best known but some are far rarer than others .All are popular and higly prized .
PEARLS IN JAPAN
The shallow coastal waters of the Japanese islands offer ideal conditions for farming pearl oysters pearls are organic gems and therefore independent of geological condition .
WORLD DISTRIBUTION
This map shows the main localities for 12 key gems each gem may of course occur in other places but probably not in sufficient quantities to make its ex traction economic some site although historically impotrtant may now be work out.
RUBIES IN BURMA
The rich mineral deposits of mogok in Burma have yield some of the world finest rubies although extraction is by traditional methods sapphires are also mined here .