Currently, there are two principal methods of permanently changing the color of a diamond:
♦ Irradiation + Heating
♦ High Pressure High Temperature Heat Treatment (HPHT treatment)
Both of these treatment processes are considered legitimate as long as they're disclosed to buyers. Unfortunately, some people try to pass off treated diamonds as naturally colored in order to get a higher price. So before investing a high sum of money in a fancy-color diamond, have the stone tested by a reputable gem ...
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