COLOUR GRADING

​Trade names must have a good proportion in cut, light return,  chromophore present and or absent, fill specific criteria in chemistry and light absorbance, Have a good transparency and colour homogeneity. 

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Each Colour trade name has its own definition, our colour master set are open to public in our offices.

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Colour Trade Name

Pigeon's Blood

This trade name originate from Burma (Myanmar) to describe the best colour in Ruby. It's suppose to be reminiscent of the Red colour of a pigeon fresh blood or reminiscent of the blood surrounding the eyes of a pigeon. 

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Royal Blue

This trade name is used to describe the best colour in Blue Sapphire, reminiscent of the finest blue used in clothing for Royal families.

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Padparadscha

This trade name is used to describe the best colour in Orangy Pink Sapphire, reminiscent of the unique hue found in wild lotus flower.

Paraiba

This trade name is used to describe the best colour in  Cuprian Elbaite Tourmaline, Reminiscent of the Vivid greenish Blue found in Paraiba old mine.

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