Glossary
Hue
Hue is the colour the eye actually perceives – red, blue, green or a transition between them. Laboratories name the dominant colour first and add a secondary hue when it is visibly present, for example «slightly purplish red» for a red with a faint purple tint. Together with tone and saturation, hue describes a gemstone’s colour completely. In every NOBILITH dossier the colour appears exactly as recorded in the laboratory report.
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- KnowledgeHow to read a gemstone dossierA dossier brings together everything that describes a stone – from the laboratory report to custody. Here is how to read it in the right order.Read more
- Laboratory reportsUnderstanding a laboratory reportA laboratory report is a gemstone's most important document. Which information it contains, how to read it and what it does not say.Read more
- GlossaryAbsorption spectrumWhen light passes through a gemstone, the stone absorbs certain wavelengths – the rest make up its colour.Read more
- GlossaryAfghanistanAfghanistan is an old source of ruby and emerald; both are mined in the mountains of the Hindu Kush.Read more
Updated 2026-10-04