traces de sciage

CONT: [...] garder des surfaces sur lesquelles les traces de sciage restent visibles (preuve qu'il n'y a pas eu trop de diamant enlevé). Ces traces seront parfois utiles pour trouver la structure cristalline de la pierre au moment de la taille en croix [...]
OBS: Un défaut.

CONT: Saw diamonds with a high blade: ... i) when sawing is complete, check the quality of the work: ensure the sawing has gone according to plan, e.g., look for deep sawing lines or gletzes that might have gone into the diamond ...
CONT: Describe a typical polishing sequence for rectangular and square emerald shapes: a) create the table: tip the table, if necessary: leave proof of the former facet, e.g., a residual facet, sawing lines, laser marks ...
OBS: A defect.