Unique single stones in rare colours, classic Champagne Diamonds (C1-C7), and selected small goods in all colours - Kulsen & Hennig GBR , one based in Germany and the other in Switzerland, have been supplying professionals throughout Europe with quality diamonds for many years.
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| Champagne Diamond |
Outstanding know-how in coloured diamonds
Kulsen & Hennig GBR have created a colour grading card for yellow diamonds to make successful communication within the jewellery trade easier. The card displays the colour scale from Faint Yellow to Fancy Vivid Yellow. A similar colour grading card for Champagne Diamonds, designed by us last year, has proven to be extremely helpful to our customers.
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| Colour grading card for yellow diamonds |
Yellow Diamonds
Yellow is one of the most common diamond colours found in the jewellery industry. Yellow diamonds with a colour saturation ranging from light to medium are available at very affordable prices. Diamonds with a very intense yellow colour are priced similarly to the most expensive white diamonds, or even higher.
Natural Fancy Coloured Diamonds whose colour saturation is clearly visible are called “Fancy”. The transition from white diamonds to coloured diamonds occurs between Light Yellow (Z) and Fancy Light Yellow.
Origins of Colour and Sources
Diamonds are mainly composed of carbon, but most also contain nitrogen. The presence of nitrogen leads to the absorption of the visible spectrum in the blue range. The diamond’s yellow colour results from the light that has not been absorbed. The nitrogen aggregates are responsible for a light yellow colour. If just one nitrogen atom replaces a carbon atom, a saturated colour results. Yellow diamonds can be found in almost all diamond mines. Until now, however, the largest and most intensely yellow diamonds have been discovered in South Africa.
This colour grading card is based on the internationally recognized GIA colour scale.
