Spotting HPHT Diamonds Detection Methods Explained

While HPHT diamonds are identical to natural diamonds in most visual aspects, specialized detection methods can identify their lab-grown origins. Jewelers and gemologists use the following approaches:

Spectroscopy - HPHT diamonds exhibit different spectral patterns under infrared or ultraviolet light compared to natural diamonds due to differences in impurities and crystal growth. These absorption or photoluminescence patterns can reveal if detectable treatments or growth methods were used.

Microscopy - Under high magnification, flow lines, graining, scrutiny in crystal shape and other indicators of artificial growth become apparent. Trained experts can discern these HPHT markers though they may not be visible to the naked eye.

Conductivity - HPHT diamonds conduct heat better than natural diamonds due to higher purity, perfection and lack of impurities. Thermal probes can detect this conductivity difference of around 50% or more in lab grown diamonds.

Diamond Verification Instrument - This specialized device developed by De Beers utilizes phosphorescence to easily screen diamonds and identify if they are HPHT or natural. The technology exploits certain molecular variations between the two.

While methods exist to identify HPHT diamonds, labs are also innovating to further eliminate telltale differences from natural diamonds. In the future, even advanced verification may not distinguish the best HPHT diamonds as detection techniques constantly evolve. For now, buyers still have options to test for HPHT origins.