-  After entering the neccesary data for stone, click on update and the editor of stone is opened. 
-  In the editor a user needs to fill Price Type, Tax field, Quantity, Unit Price, Discount, Reference Number, Description. Quantity can be in pc or ct based on the item selected. 
-  If the tax is selected from its drop down it will calculate the amount to be paid by the user. If a item has a discount its amount is calculated in the final paid amount. 
-  The selling price is automatically calculated based on Unit Price and its discount.