Diamond treatments: excessive-pressure excessive-Temperature (HPHT)

excessive-stress, high-Temperature or HPHT is a everlasting treatment in which warmth is used on herbal brown diamonds with the intention to enhance their excellent of colour. nearly all stones possess some diploma of yellow or brown shade in them, and the HPHT procedure can lessen the arrival of color in the stone or enhance it. the colours produced with the aid of stones which have gone through the HPHT manner consist of clean white, yellow, orange, brown, inexperienced and blue.

The HPHT method is a famous treatment due in large part to its noticeably low cost. The HPHT approach can most effective be applied to stones which can be classified as both kind I or kind II. kind I stones incorporate nitrogen and will turn yellow after the HPHT method, whilst the sort II variety are definitely nitrogen-unfastened and will render the stones colorless.

The HPHT technique makes use of a belt press, study gemology a cubic press, and a cut up-sphere (BARS) press so that you can supply the temperature and strain essential to effectively change a stone's's coloration. The belt press, which was invented by means of H. Tracy corridor from wellknown electric uses strain and temperature amounting as much as 50,000 and 70,000 atmospheres. right here a carbon source, a cylindrical pill and a steel slug all come together as an appropriate strain-temperature is completed.

moreover, the cubic press became developed to growth the pressurized extent created with the aid of the belt press. The complete HPHT system can take hours, and within the method, tiny diamond bits are produced. at the same time as those tiny stones are too small for use as gemstones, they're extremely beneficial for industrial or technological applications. because of their severe sturdiness, those tiny stones play a formidable element in cutting, drilling, grinding and sharpening a extensive variety of substances.

Stones which have undergone the HPHT treatment are used for commercial purposes. in this regard, they may be extra popular than herbal stones due to the fact that their mechanical residences are extra without problems reproduced.

Stones that have passed through the HPHT manner also are used and bought as gemstones or for jewellery. they're to be had in colorless, yellow and blue. Yellow HPHT stones are a result of nitrogen impurities that occur for the duration of the manufacturing technique. whilst boron causes some HPHT stones to seem blue. Rarer shades such as red or inexperienced are sometimes produced after HPHT stones are synthesized with the usage of irradiation techniques.