The diamond industry is a global market, which, unlike most industries where the local economic and political situation can greatly affect prices, diamond prices vary little around the world. The ‘Four C’s provide a grading system that supports a standard pricing system. Diamonds are also universally quoted in dollars, removing any currency effects. However, the craftsmanship and labour costs to design and set diamonds are subject to local conditions. A new ‘C’ has been added to their criteria which guarantees that the diamonds have not come from conflict zones.