What are the four types of diamonds?

The four types of diamonds are natural, lab-grown, treated and natural fancy-colored. Natural diamonds are those derived from mines, while lab-grown diamonds are human-made. A treated diamond comes from a mine but then undergoes an enhancement process to improve its appearance. Diamonds in colors other than white that come from mines rather than laboratories are naturally fancy-colored. On 1stDibs, find a wide range of diamond jewelry.