23. Oct IGC 2023 Colour change Paraiba tourmaline from Brazil By Claudio C. Milisenda, Stefan Müller Download Pdf Tourmaline
23. Oct IGC 2023 Mechanism and Application of High-Temperature Copper Diffusion in Surface Recoloring of Labradorites Feldspar, with the chemical formula of [KAlSi3 O8 ]x[NaAlSi3 O8 ]y[CaAl2 Si2 O8 ]z (x + y + z = 100) Read More Elodie
23. Oct IGC 2023 Colour varieties of gems – where to set the boundary? In theory it is simple: a gemstone is a mineral formed in nature by geological processes and, as suc Read More Elodie
23. Oct IGC 2023 Nacreous Blister Pearl Discovered in Edible Oyster (Crassostrea gigas) A baroque pearl with a gray, nacreous appearance was discovered attached to the interior of an edibl Read More Elodie
