The invention provides a method of changing a grey type IIb diamond from grey to blue or enhancing the colour of a type IIb diamond. Selected conditions of high temperature and high pressure are used to produce the colour change.
申请公布号
GB0007890(D0)
申请公布日期
2000.05.17
申请号
GB20000007890
申请日期
2000.03.31
申请人
BEERS INDUSTRIAL DIAMOND DIVISION(PROPRIETARY), DE LIMITED