Wednesday, May 27, 2009

Amber Gemstone: A Beautiful Organic Substance

Amber Gemstone is a natural organic substance, known for its color and glow. Amber is made up of fossil tree resin and is generally used to make attractive things such as jewelry etc. Tree resin is the semi-solid shapeless natural substance buried in pockets and canals through epithelial cells of the plant.

As amber is made up of soft and sticky tree resin, so sometimes it may have insects and small plants fossils. This form of amber is known as Copal as it is a Semi-fossilized resin or sub-fossil amber. Amber is also found in different colors such as it may have yellow, orange and brown shades or whitish and pale lemon color. It may vary from brown to black and in some rarely found form such as blue amber, green amber, red amber (also known as "cherry amber") etc.

Amber is generally translucent, the more the amber is transparent the more the price it has. The most common form of amber is cloudy amber and opaque amber. Opaque amber may have numerous minute bubbles. This form of amber is also known as "bony amber".

Monday, May 18, 2009

Gemstones Grading: Ensures The Quality Of Gemstone And Jewellery

gemstones grading certificationNow a day’s, before to purchase jewellery or gemstones most of the people generally asked about its quality certificate. Certificate or Grading from a recognized authority generally ensure the customers about the quality of the products. From the last few years there is increase in number of certifications for the quality of gemstone.

There are many laboratories that provide certification for the quality of gemstones and there is no global grading system for the quality of gemstone.

Various Laboratories which provides grading to jewellery and gemstones include:

1) International Gemological Institute (IGI) is an independent laboratory which grades both jewellery and precious stones.

2) Gemological Institute of America (GIA) provides various types of information and grading reports related to jewellery and gemstones.

3) American Gemological Society (AGS) is other famous society recognized in this field.

4) Other famous Laboratory for which grades stones is American Gem Trade Laboratory. This Laboratory is the part of American Gem Trade Association (AGTA).

5) European Gemological Laboratory (EGL) is other laboratory which grade gemstones.

6) One organization which is famous for gemological research is Gemological Association of All Japan (GAAJ).

Other famous institutes which are famous in gemmological research are Gemmological Institute of Thailand (GIT), Asian Institute of Gemmological Sciences (AIGS), Swiss Gemmological Institute (SSEF), Gübelin Gem Lab etc.

Each and every laboratory has its own method to test gemstones. So to standardized the grading system, seven most reputed laboratories such as GAAJ (Tokyo), AGTA-GTL (New York), GIA (Carlsbad), GIT (Bangkok), CISGEM (Milano), Gübelin (Lucerne) and SSEF (Basel) have established a new laboratory committee known as Laboratory Manual Harmonisation Committee (LMHC). The main aim of this laboratory is to standardize the whole testing process of the gemstones.

Monday, May 11, 2009

Precious Stones: Parameters Used To Access The Value Of These Gemstones

precious gem stones

Precious stones are special types of rocks or minerals that are used to develop various form of beautiful and expensive jewellery. Before to use in jewellery, these precious stones are cut, polished and design to form in beautiful shapes and sizes. Precious stones are also known as gem stones. They can occur both naturally or can develop artificially in labs.

Artificial precious stones are generally less expensive when compare to natural precious stones. Natural precious stone can further be characterized as organic precious stone such as Amber, Jet etc. Amber is made up from fossilized tree resin while Jet is a type of coal. Precious stone can also characterize on the basis of their hardness. Some stone are too hard while some stone are soft. Some precious stone are too soft that they can’t be used to develop jewellery such as single-crystal rhodochrosite.

Precious stone can also be characterized on the basis of their chemical composition such as diamonds are made up of carbon. Precious stones also be put into different group of species such as emerald is a type of mineral species known as beryl. On the basis of these different characteristics (characteristic such as refractive index, dispersion, hardness, fracture, lusters etc.), value of these gemstones can be access by different jewelers.

Tuesday, May 5, 2009

Emerald Jewellery: Beautiful Birth-Stone Represents Month Of May

Emerald JewelleryEmerald is one of the amazing and stylish stone which people love to wear. Emerald represents the month of May and many people believed that this stone has amazing effects especially in case of relationships, health and heart.

Emerald is a beautiful stone which attracts and admire by many people and due to its dazzling beauty emerald is used in many form of jewelleries such as rings, earrings, Necklace etc. It is one of the fabulous birthday gifts which you can give to your love ones.

Emerald stone has dark green color because of chromium and vanadium and its hardness rating is around 7.5. As Emerald is one the most beautiful stone that’s why it requires special care. So to clean jewellery made from emerald always use dry soft cloths. Avoid household chemicals and ultrasonic jewelry cleaners to clean emerald jewellery. Also do not clean your precious emerald jewelry in hot soapy water.