This alexandrite ... stone and are only in zones or narrow bands. In such cases the cutter must orient the needles with care to produce a cat’s-eye.A chatoyant cabochon, weighing 21.22 ct and ...

Earth’s warming could trigger sweeping changes in the natural world that would be hard, if not impossible, to reverse. In his first few weeks, President Trump has frozen climate spending ...

Welcome to GIA. Students around the globe turn to GIA for the knowledge, skills, and credentials that launch successful gem and jewelry careers. Through research, education, and unbiased gem grading ...

Extreme heat has caused more deaths in Australia than any other natural hazard and has major impacts on ecosystems and infrastructure ... An increase of 1.5 °C is a threshold that is widely referenced ...