During the tour, your personal guide explains everything you want to know about the mystical world of diamonds. He or she will tell you about the origins of the diamonds and the process a diamond goes through. This diamond process takes millions of years. Learn how to evaluate a diamond with the 4 C's (carat, cut, clarity, color) of diamond valuation. There is so much more to know and appreciate about a diamond than just the sparkle. You will be surprised. Besides seeing amazing diamond jewelry and Europe's largest collection of unset diamonds, you will also see the Royal 201 diamond. This is Royal Coster's own patented diamond cut and known to be the best diamond in the world. A regular brilliant has 57 facets, while this unique diamond cut has no less than 201 facets. These extra facets cause to make the light reflect even more within the diamond. This creates a sparkling effect that is no match for any other diamond shape in the world.