Three main criteria exist which determine the price of diamonds: its size, color and pureness. While diamond prices continually increase in value on average, significant differences exist in the value yield within each of the three aforementioned categories. While engaging in a speculation as to the price of a diamond is generally impossible due to its very small fluctuations, such speculation is by all means possible within these three evaluation categories, since a completely different price behavior, which is based on the market situation, comes to light here.

Diamond value increases can be divided into the following categories:

Value increases over longer periods of time for different diamond sizes
Value increases related to color/s quality
Value increases are related to pureness.