Gemstones Guide.

Gemstone Name : Turquoise .

Description :
The chemical term is copper bearing hydrous aluminium phospate.
But sweat or even soap water may bleach the colour.so remove the ring before going to bed.It is cut in cabochon fashion.

Colour : Colour is due to the presence of iron and copper.

Hardness : 5.6 ; Specific gravity : 2.6 to 2.8.It's density is 2.65 to 2.75.

Found in : Persia, Afghanistan,Australia,USA.

Gemstone Name : Tourmaline .

Description :
The chemical term is borosilicate of aluminium.Sensitive to heat.The crystal is Trigonal.lusture vitreous to transparent.

Colour : The different colours are blue, yellow and brown.The colour is due to Nickel,cobalt and Titanium.

Hardness : 7 to 7.5 ; Specific gravity : 3 to 3.2

Found in : USA,Brazil, Madagascar,Sri lanka and West africa.

Gemstone Name : Garnets.

Description :
Garnets are similar to Tourmaline.These are formed from Metamorphic rocks.Ranges from transparent to opaque.They may be facet cut or cabochon cut.

Colour : Garnets are known in all colours except in blue.The colour is due to iron, Magnesium, chromium and titanium.

Hardness : 6.5 to 7.5 ; Specific gravity : 4 to 6

Found in : South africa,USA and Sri lanka.

Gemstone Name : Zircon.

Description :
It is formed from Ignesous rocks.

Colour : colour range is red, yellow, green, blue.
The colour is due to radioactive elements.

Hardness : 2 to 2.5 ; Specific gravity : 4 to 4.7

Found in : South africa,USA and Sri lanka.

Gemstone Name : Lapis Lazuli.

Description :
Lapis luzili means blue stone.(Lazuli is derived from Arabic word meaning blue similar to french word "Azur".Earliest gemstone to be used in jewellery.It is more frequently used as a decorative mineral.The tiny gold colour specks are due to iron pyrites.Lusture is vitreous to greasy.It is always cut as cabochon fashion.

Colour :
The blue colour is due to the presence of sulphur and Lazurite.

Hardness : 6; Specific gravity : 2.4 to 2.9

Found in : Burma and Tibet.