Diamonds andDiamond Grading Course
Diamondsfor the Retail Jeweller Course
Metals used in Jewellery Course
Essentials of Coloured Stones Course
Coloured StoneGrading Course
Coloured DiamondGrading Course
Liquid with high refractive index – is used by gemologists together with a refractometer in order to ascertain the RI’s of gemstones which helps identify and distinguish them.
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