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GEMSTONE [5 records]

Record 1 2024-03-14

English

Subject field(s)
  • Gemmology
  • Jewellery
CONT

[The Hillquist hole saw] works in a manner similar to a gem drill but uses larger diameter tubes to cut buttons, rings, and similar pieces.

French

Domaine(s)
  • Gemmologie
  • Joaillerie et bijouterie

Spanish

Save record 1

Record 2 2006-03-14

English

Subject field(s)
  • Gemmology
  • Mineralogy
DEF

In the mineralogical sense, one of the orders of minerals used by Mohs, distinguished by their hardness - enough to scratch quartz - transparency, non-metallic luster, but generally brilliant and beautiful.

CONT

Miarolitic pegmatites are an important source of gemstones such as beryl (emerald), topaz, and tourmaline.

French

Domaine(s)
  • Gemmologie
  • Minéralogie
DEF

Minéral considéré comme une pierre précieuse.

CONT

Les gemmes possèdent généralement un éclat vif (dit adamantin), une grande réfringence et une grande dureté.

CONT

Les pegmatites miarolitiques sont une source importante de gemmes telles que le béryl (émeraudes), la topaze et la tourmaline.

Spanish

Save record 2

Record 3 2004-02-25

English

Subject field(s)
  • Gemmology
  • Economic Geology
CONT

... Argyle stones represent only 7% of world production, as 95% of the diamonds mined are either industrial grade or poor quality gemstones.

French

Domaine(s)
  • Gemmologie
  • Géologie économique
CONT

[...] les pierres de la mine Argyle AK1 ne représentent que 7 % de la production mondiale puisque 95 % des pierres sont de qualité industrielle ou des gemmes de qualité pauvre.

Spanish

Save record 3

Record 4 1983-03-29

English

Subject field(s)
  • Mineralogy

French

Domaine(s)
  • Minéralogie
OBS

(du nom de l'Anglais W.H. Wollaston), Minér. Silicate naturel de calcium ...

OBS

Ce terme est féminin.

Spanish

Save record 4

Record 5 1975-03-11

English

Subject field(s)
  • Goldsmithing and Silversmithing
  • Jewellery
  • Gemmology
CONT

The U.S. Trade Commission has restricted the term synthetic gem to manufactured materials that have the same chemical, physical and optical properties as their naturally occurring counterparts.

French

Domaine(s)
  • Orfèvrerie et argenterie
  • Joaillerie et bijouterie
  • Gemmologie
CONT

C'est au professeur [...] Verneuil que l'on doit la méthode pratique de fabrication des pierres synthétiques.

OBS

Le qualificatif [s'applique] aux produits [...] ayant les propriétés [...] des pierres qu'ils reproduisent.

Spanish

Save record 5

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