Diamonds andDiamond Grading Course
Diamondsfor the Retail Jeweller Course
Metals used in Jewellery Course
Essentials of Coloured Stones Course
Introduction to Tanzanite Course
Coloured StoneGrading Course
Coloured DiamondGrading Course
A device for viewing diamonds that indicates the degree to which the top and bottom angles of the diamond fall within accepted parameters.
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