Masonry can be defined as the construction of building units together with mortar. Stones and bricks are the commonly used building units. Masonry may also be used for the construction of walls. It may be divided into two as stone masonry and brick masonry. Stone masonry is mainly used for constructing the fence whereas the Brick Masonry is used for constructing the walls of buildings. Stone masonry is the roughest and cheapest form of stone walling. Stone Masonry is divided into two as Rubble Masonry and Ashlar Masonry. Rubble masonry is again divided into random rubble and square rubble. In Random rubble, the stones used are of widely different sizes, whereas in square rubble, the stones used are usually squared and should brought to hammer dressed or straight cut finish. Polygon walling is also a type of rubble masonry.In this type,the stones are hammer finished on face to an irregular polygonal shape. These stones are bedded in position to show face joints running irregularly in all directions.

In Ashlar Masonry, the stones used may be extremely dressed. The blocks may be either square and rectangular shape. There are different types of ashlar masonries. One such type is ashlar fine tooled masonry. It is the finest type of stone masonry work. Here each stone is cut to regular size and shape. So as to have all sides rectangular. So that the stone give perfectly horizontal and vertical joints with adjoining stone. Another type is ashlar rough tooled, here the only difference is that bed and sides of each stone block are finely hammered. here the exposed face is finished by rough tooling.

Trading in precious metals is a speculative industry. An investor in precious metals must be aware of all events and world conditions affecting the value of metals from hour to hour. Precious metals are available as powder or bars and in different grades of modification. Each form is affected differently in terms of market value. Precious metals are traded like stock in the exchange. The traders operate on behalf of their clients for buying or selling precious metals. The dealer quotes the prices of precious metals which they want to buy or sell. The traders on the floor quote prices until they come to an agreement. The amount agreed upon becomes the current trading price of precious metals.

Online companies act as an electronic market place for trading in precious metals. Online buying and selling is convenient and easy. In order to purchase or sell, the client has to request a quote. The company will send an indicative order detailing the current market price of the product. When the client agrees to proceed, the company will lock the price amount. All trading companies have a minimum order limit. Companies offer discounts on bulk orders. The payment form includes wire transfer and electronic fund transfer. The handling, delivery and insurance charges vary with the weight of precious metals. Some online trading companies offer pool account trading.

Online companies offer full and mini sized contracts based on the quantity of precious metals. These contracts are useful for retail, commercial and institutional traders. The features of online companies include instant trade execution, global distribution, continuous trading hours, market transparency, financial integrity, and competitive exchange fees. Online trading companies provide services like lease rate charts, financial indexes, live quotes, and international currency charts. They also offer precious metal quotes and charts to cell phones and wireless devices.