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History of the Diamond
Diamond Mining and Treatment
The Diamond Syndicate
14 other sections not shown
10x loupe absorption appear beneath the table blue brilliant cut carat Certificate CIBJO clarity grade cleavage cracks colour grades comparison set crown and pavilion crown angle crown facets crown height culet cut diamonds cut grading cutter damaged culet dark inclusions definition described diagram diamond bourses diamond brilliant diamond grading diamond simulants diamond wholesalers example Expert Opinion external features extra facet facet edges fancy colours Figure finish grade fluorescence fracture cracks fringed girdle Gemmological gemstone girdle diameter girdle thickness Idar-Oberstein internal jewellery light loupe-clean lower girdle facets lower main facets magnification manufacture medium natural nick observed optical pavilion height pinpoint inclusions pique possible proportions rarity re-cutting refractive index result rough culet rough diamonds scratches small inclusions strontium titanate synthetic diamonds Tinted Top Wesselton total height total reflection trade practice trained expert upper girdle facets upper main facets valuation visible White yellow