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
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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