The gemstone laboratories | Unsaid Library
The gemstone laboratories Gemstone laboratories are exclusively concerned with the evaluation of polished gemstones. The four “C’s” described above are assessed using the most modern...
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How do they determine the colour and quality of a diamond? | Unsaid Library
Judging the colour of the diamond How a colour diamond is judged is rather subjective. A pure diamond is colourless. Usually, the less color, the...