NOBILITH Academy
Knowledge
Articles on specific questions in gemmology: treatments, origin, durability and reading laboratory reports.
- How 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
- Natural, synthetic and imitation materialThree terms that are often confused: what they mean, how a laboratory tells them apart and why the classification must never rest on assumption.Read more
- Why colour changes under different lightThe same stone can look different in daylight than under a lamp. The reason lies in the interplay of light source, absorption and the eye.Read more
- What treatment disclosure meansMany gemstones are treated to improve colour or clarity. What matters is not whether a stone was treated but whether this is stated openly and precisely.Read more
- Inclusions and durabilityInclusions are a gemstone's fingerprint. Most are harmless, some deserve attention – what matters are their type, position and extent.Read more
- Carat weight and visual sizeThe carat measures weight, not size. Why two stones of the same weight can look different in size and what to consider when comparing them.Read more
- Origin, provenance and chain of custodyThree terms, three questions: where did the stone form, what history is documented, and who held it when? Why they should not be confused.Read more
- How to compare two gemstones responsiblyA fair comparison places verified facts side by side, not marketing promises. A guide in seven steps.Read more
- Caring for valuable gemstonesProper care depends on the stone: its hardness, its toughness and any treatment. What helps, what harms and when to consult a professional.Read more
- Why a laboratory may say inconclusiveSometimes a question cannot be answered responsibly with the available data. What “inconclusive” means – and what it does not.Read more