The stones used by CRA vary depending on your budget. Commonly Cubic Zirconia (CZ) stones are used to give a look similar to diamonds.
Cubic Zirconia is a synthetic, cubic crystalline form of zirconium dioxide. It has a close visual likeness to diamonds and is hard, optically flawless and colourless.
Diamonds range in price according their grading. Grading of Diamonds depends on Clarity, Carat, Colour and Cut. For more information relating to Diamond grading – click the link to Wikipedia [here]
Cubic Zirconia’s and Simulated gemstones are available in the following colour range:
Cubic Zirconia Colours
Simulated Stone Colours