Net price can vary from -60% up to +50% in function of different missing quality criteria:
Cut, Polish, Symmetry, EX EX EX, H&A, Fluorescence, Girdle thickness, Flawless.
Each natural diamond is absolutely unique!
Even within exactly the same carat weight and grading opinion of cut – color - clarity (indeed opinion, not a mathematical fact!) many other qualities will also differ and prices may differ.
Each natural diamond is also unique in pricing.
Prices are a. o. based on Diamond Bourse daily exchange rates.
Asking for the price of a diamond is like asking for: Give the price of a car.
Some general advice:
Prices per carat "price steps" leads to some strange higher prices for extreme carat weights such as 0.99 Carat.
A 0.99 carat with excellent cut will cost as much as a one carat with a fair or good cut
You can calculate retail prices with this chart before sales tax.
You will find market selling prices per unit in US $ - Free printable In this detailed list.
There is a very wide price range between the best quality and the lowest quality!