Characterization of Coloured Gemstones by X-ray Micro Computed Tomography

The monetary value of gemstones is based on five variables: rarity, cut, weight, color and clarity. latter refers to internal impurities defects. Fashion may also dictate demand price. To enhance some these features value, are treated. Disclosure or nondisclosure thereof has been controversial affected consumer confidence. Most treatments difficult detect with the naked eye accurately quantify traditional optical analytical methods. X-ray micro computed tomography (micro-CT μCT) proposed as a relatively low cost, physically non-destructive complementary method clarity enhancement provide unique 3D fingerprint each gemstone. A collection 14 cut colored was selected. Micro-CT scans allowed fracture detection, their distribution calculation filler volume well mapping inclusions, surface imperfections artificially induced modifications. As result allows construction digital twin. exposure could however induce unwanted changes. This effect minimized eliminated by optimizing dosage time.