Firstly a diamond is priced per carat. So, lets say a 1.05 carat diamond clarity is a SI1 and Color D if will have a full retail price of $8600 per carat. That diamond’s price for the stone would be $9030. Secondly, diamond prices per carat increase as you jump up to higher weight categories. The also change according to Clatity, Color and Cut.
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Applying for a diamond Licence is complex in South Africa, The new mining charter makes structuring and breaking into the business as a dealer or beneficiation licence, almost impossible. You will require technical ability, business plan and a load of other paperwork – with specific licenses varying – based on your country . 
