Ring with Zambian Amethyst

How can we recognize a precious, high quality stone? The first factor that we look at is colour. The most valuable pieces have a deep, saturated and even colour in the most desirable shade.
The colour should be emphasized by a great cut, thanks to which the stone will equally reflect light. 

The value is obviously also affected by the size, purity and if it is completely natural, without any kind of interference. Jewels of this kind only make up a few percent of the entire precious stone market and they are worth every price.