36.19ct bolivian ametrine gemstones igcam16Whether projecting from pegmatite walls or encrusting cavities in volcanic rock, quartz abounds worldwide. People have used quartz in jewelry for thousands of years. When quartz displays the colors of amethyst and citrine in a single gem, the material is called ametrine or amethyst citrine. Ametrines only commercial source is the Anahi mine in Bolivia. 16

IGC Natural Good Quality Emerald Of Zambia Origin it is selected gem beautiful stone IGCZZM16

In sha Allah Natural Aquamarine stone with top clarity and best cutting IGCGA83

IGC Natural Good Quality Emerald Of Zambia Origin it is selected gem beautiful stone IGCZZM456

IGC Natural Good Quality Emerald Of Zambia Origin it is selected gem beautiful stone IGCZZM337

IGC Natural Good Quality Emerald Of Zambia Origin it is selected gem beautiful stone IGCZZM377

but in actuality it can be a valuable gem

Understanding the color origin of gem-grade diaspore could provide a scientific basis to guide its gemological testing

IGC Natural Good Quality Emerald Of Zambia Origin it is selected gem beautiful stone IGCZZM349

IGC Natural Good Quality Emerald Of Zambia Origin it is selected gem beautiful stone IGCZZM132

In sha Allah Natural Aquamarine stone with top clarity and best cutting IGCGA54

In sha Allah Natural Aquamarine stone with top clarity and best cutting IGCGA86

This study uses ultraviolet-visible (UV-Vis) spectra and laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) to examine the color origin of color-change diaspore and to compare it with corundum