HPHT High pressure high temperature diamond treatment used for lightening and changing color. GE POL was the innovator and first marketing company to offer this type of treated diamond product.
[HPHT "Press" used by Sundance, Inc. to color treat diamonds, an example of a "before and after" showing a dramatic improvement in color: Images courtesy of Sundance, Inc.] ...
HPHT stands for high pressure, high temperature, and is a laboratory process which can be used to change the color in some gem diamonds. HPHT treatment can change the color of certain Type IIa diamonds, making them colorless, pink or blue.
The new treatment popular today is called HPHT- High Pressure/High Temperature treatment .
High Pressure High Temperature (HPHT)
In this method a small sliver of genuine diamond is immersed in a molten mixture of graphite and metal-based catalyst at high pressure of 5-6 GPa and temperature of 1500 degree Celsius in the crystal growth ...
High Pressure/High Temperature (HPHT) treatment, is a process developed by General Electric whereby type IIa diamonds of low color (N-O) or even fancy brown color, ...
Their process is almost the opposite of the HPHT methods, and is known as CVD, Chemical Vapour Deposition, but in the case of diamond it clould also be called Carbon Vapour Deposition.
While laser drilling and fracture filling are used to improve a diamond's clarity, high pressure / high temperature (HPHT) treatments are used to improve color by removing brown colorations from the diamond.
A new high-pressure high-temperature treatment, known as HPHT, can improve the color of certain types of diamonds.
Among the most common are using HPHT (high pressure, high temperature), CVD (chemical vapor deposition), irradiation, surface coating, and heat treatment.
In the case of synthetic diamonds, for example, depending on the method of production (either HPHT produced or CVD produced) and the color of the diamond (colored, D-Z color range or D-J color range), ...
As well as testing for synthetic diamonds, the HRD lab also uses state-of-the-art technology to test for subtle and hard to recognize enhancements such as HPHT.
The innovative method to produce the replication of diamond is High Pressure High Temperature (HPHT) method which is a relatively low cost method. The technique uses a four-anvil 'tetrahedral press,' or six-anvil 'cubic press.
High pressure High temperature (HPHT)
Form of diamond enhancement technique where high pressure and high temperature are recreated (as in a diamond's natural environment of formation) in order to improve diamond color.
Hope diamond ...
Color enhancement is the improvement process of a diamond's color mainly by irradiation and HPHT (High Pressure, High Temperature). Sometimes color coating is also used to enhance the diamond's color which is not considered as best enhancement way.
High Pressure High Temperature (HPHT Treatment)
A process to improve the body color of the diamond through high pressure and high temperature.
Hue ...
Techniques include laser drilling, fracture filling (clarity enhancement), high pressure high temperature (HPHT) annealing, irradiation, and surface coloration.
Treated: Diamonds that have been artificially modified to improve their color or clarity. Techniques include laser drilling, fracture filling (clarity enhancement), high pressure high temperature (HPHT) annealing, irradiation, ...
surface-reaching fissure walls and redeposit that dissolved gem material, healing the fissures closed. Example: Flux-healed ruby (particularly that from Möng Hsu, Burma)
HP = Heat + Pressure: Alteration via heat and pressure. Example: HPHT ...
 See also: Diamond, Stone, Natural, Jewel, Rough
  
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