Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper

Sixteen rough diamonds were acquired in 2023 by co-author TTS from a gem dealer linked to Mong Hsu,

Synthesis methods to produce large and high-quality dia- mond for jewellery have been improved over

Fancy colour diamonds that derive their colour from nitro- gen-related defects (such as N3/N2 center