study gemology

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