browns,brown wrapping paper

There are many brown spots on the diamonds from Hunan Province, which is one of the three important diamond places in China.

湖南省是我国 3个主要金刚石产地之一 ,所产金刚石的表面有大量的褐色斑点。

The tentative experiments of brown diamond samples under HTHP treatment are developed by using the synthetic equipment.

以Nova钻石、GE POL钻石和灰色钻石为例,从钻石晶格缺陷的角度讨论高温高压(HTHP)处理钻石的改色机理;在高温高压处理褐色钻石的研究基础上,利用静压触媒法合成设备,对褐色钻石样品进行高温高压处理的实验探索,并对实验前、后的样品进行红外光谱、激光拉曼光谱特征分析,初步探讨其颜色改变的原因,为今后的实验提供一定的参考。