Diamond knowledge
Guides en français sur les rapports, l’état, les proportions Old Mine, les grandes pierres et les contours anciens.
Ces guides distinguent les faits vérifiables, le jugement visuel et les questions qui exigent un examen complémentaire.
Guide section
Learn the main shapes, facet patterns and visual differences before comparing individual stones.
Back to guide routesGuide section
Use these guides to compare proportions, light behaviour and the differences between historic cutting families.
Back to guide routesGuide section
Read the grading report beside photographs, movement videos and a detailed condition examination.
Back to guide routesComprendre poids, mesures, couleur, pureté, fluorescence et limites du rapport pour les tailles anciennes.
Read the guideÉvaluer le rondiste, les égrisures, l’usure, les traces de polissage et les réparations, distinctement de la pureté.
Read the guideGuide section
Work through the decisions that matter when buying a large stone, choosing a setting, matching a pair or considering natural colour.
Back to guide routesDemande confidentielle
Tell us what you are comparing or collecting. We will answer in the context of real available material.
Receive occasional notes on newly available diamonds, antique cuts and private viewings.
