1 ALMANDINE – Gems stone
Pink Color Tourmaline Specimen

Pink Color Tourmaline Specimen

Beautiful Natural Golden Colour Topaz Specimen From Pakistan More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen,Crystal Tourmaline, More »

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes

Tourmaline Cuts Shapes,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

watermelon Tourmaline

watermelon Tourmaline

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

Blue sapphire gemstone Specimen

Blue sapphire gemstone Specimen

watermelon Tourmaline,Blue sapphire gemstone Specimen,sapphire crystal Specimen,Tourmaline Specimen, More »

 

Category Archives: ALMANDINE

Topped Doublet

TOPPED DOUBLET

A doublet is a stone made of two separate piece cemented togather to create the appearance of a precious stone .Glass topped by red almandine garnet is the most common form ,with green glass  used to imitate emerald ,blue to imitate sapphire .Once joined ,the stone is faceted and polished .

REMARK: These stones were very popular in Britain and the rest of Europ in the Victorian era .

ANDRADITE

Garnets containing titanium and manganese are grouped as andradite garnet .The most vauable is demantoid ,whose emerald-green colour is due to the presence of chromium .It has a higher dispersions then diamond and can be recognized by the characteristic “horsetails “ ,which are fine ,hair-like  inclusions of asbestos .Topazolite the yellow variety of andradite garnet, varies from pale to dark yellow ,only small crystals are found

OCCURRENCE : The best demantoid is found in the Urasl in Russia ,and is associated with gold-bearing sands and  metamorphic rocks . Other localities include northern Itly  ,Zaira ,and kenya .Topazolite crystals are found in the Swiss and Italian Alps in metamorphic rocks .Metanite is found in metamorphic rocks and volcanic lavas; find crystals are found on the island of Elba (Itly ), and in france and Germany .

Hessonite

HESSONITE

Grossular garnet occur in a very wide range of colours ,from colourless right through to black, but derive their name from the first specimen ever found ,a distinctive gooseberry –green colour .The orange-brown  colour of hessonite grossular garnet is due to manganese and iron inclusions.

OCCURRENCE: The best hessonite garnet are found in Srilnka in metamorphic rocks,or gem gravels and sands .In Madadascar hessonite is often reffered to as cinnamon stone .Other localities include Brazil ,Canada,and Siberia (Russia) ,asa well as maine, California ,and New Hamphsire in the USA.

REMARK: Both the Ancient Greek and Romans made cameos ,intaglios ,and cabochons from hessonite ,and faceted stones for jewellery .

Pure grossular garnet is colourless ,but impurities incorporated during its formation cause a wide range of colours .This pink variety results from the presence of iron .

OCCURRENCE : Pink grossular is found in mexico, usually as a massive form in metamorphic rocks .Crystals are rare .It also occur in South Africa .

REMARK : Pinkish grossular from Mexico may be known as rosolite .

GREEN GROSSULAR

There are two varieties of green grossular : one is found as transparent crystals ,the other is massive .Massive green grossular from South Africa is called  Transvaal jade ,after its main locality and because it resembles jade . it may contain black specks of the mineral magnetite .Since the 1960s a transparent ,green grossular garnet ,named tsavorite ,has been mined in

 

kenya .Massive green grossular is used as a decorative stones; tsavorite is faceted as a gem.

OCCURRENCE : Found in Canada ,Srilanka ,Pakistan ,the former USSR ,Tanzania ,South Africa ,and the USA . kenya is the main source for tsavorite .

REMARK: The name “grossular” is derived from the botanical name of the gooseberry ,R .grossularia .Massive grossular garnet of a gooseberry –green colour was first discovered in the former USSR.Since then it has also been found in hungary and Italy .