O léxico
Glossário do comércio de pedras preciosas
O vocabulário do comércio de pedras preciosas, definido da forma como os laboratórios e os comerciantes o utilizam na prática. Cada termo remete para o catálogo que descreve.
A
C
- CabochonA cabochon is a stone polished into a smooth dome without facets, usually over a flat or gently rounded base.
- CaratA carat is the trade's unit of weight: one fifth of a gram, divided into one hundred points.
- Certificate mismatchA certificate mismatch is any disagreement between a stone and the report that travels with it: weight, measurements or inclusions that do not correspond to what sits in the paper.
- Colour zoningColour zoning is uneven distribution of colour within a stone: straight bands, patches or sectors following the crystal's growth.
E
F
H
I
L
N
O
P
- PadparadschaPadparadscha is a sapphire showing a delicate blend of pink and orange, with neither colour winning.
- Pigeon's bloodPigeon's blood is the trade term for the most saturated pure red in ruby: red with no more than a whisper of purple, medium to medium-dark in tone, and lit from within.
- PleochroismPleochroism is the property of showing different colours when a stone is viewed along different crystal directions.
- ProvenanceProvenance is the documented history of a stone after it left the ground: where it has been, who has owned it, which reports and invoices have travelled with it.
R
S
T
- ToneTone is how light or dark a colour is, independent of how pure it is.
- TrapicheTrapiche is a rare growth pattern in which six sectors radiate from a central core, separated by dark spokes, so the stone looks like a wheel seen from above.
- Treatment disclosureTreatment disclosure is the obligation to state, in writing and at the point of sale, every treatment a stone has received.
U
W