Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).
Read MorePresents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.
Read MoreTwo instruments have been developed at De Beers DTC Research Centre, Maidenhead, to distinguish synthetic diamonds from natural diamonds.
Read MoreA treatise on the design, display, care and repair of fine gemstones.
Read MoreThe gemmological properties and chemical compositions of two unusual colour-change garnets are reviewed.
Read MoreBuying gems or jewellery can be challenging even when one has access to a fully equipped lab.
Read MoreModern gemmologists and diamantaires are faced with a broad spectrum of colour and clarity treatments ranging from the simple to the highly sophisticated.
Read MoreWhen Isaac Newton first held a prism up to the sun, he scarcely could have imagined the influence of the spectroscope on modern gem testing.
Read MoreAlthough GIA’s system for evaluating diamond quality has been an industry benchmark since 1955, it all began with the efforts of Robert Shipley Sr. and Richard T. Liddicoat a decade earlier.
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