An approach to understanding the factors in the emerald enhancement clarity grading system used at CDTECGemlab
Javier Garcia-Toloza, Juan David Rincón, Cristian Ochoa, Julio Cedeño Carlos
Gemological Characteristics of New Transparent Brown Sapphire
A newly observed variety of faceted transparent brown sapphire has recently entered the gem market,
Padparadscha Sapphire & heat treatment
In 2018 the Padparadscha engagement ring of Princess Eugenie (Figure 1), the niece of the king, gave