TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

GEM QUALITY [12 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-04-21

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

A thin, but cuttable, rough diamond.

CONT

... flats are thin wedges, whole or broken, including thin macles.

CONT

Stones produce round brilliant polished; shapes yield marquise, oval, emeralds; thick macles produce triangles, hearts, marquise, pears, thin macles and flats produce baguettes.

OBS

One of the five basic categories into which gem quality rough is sorted.

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
DEF

Nom donné à un diamant brut se présentant sous forme d'un cristal plat.

CONT

Les flats (ou cristaux plats) sont des cubes minces, entiers ou brisés, comprenant des macles épais.

CONT

Les pierres produisent des brillants polis, les mélés donnent des marquises, des ovales et des émeraudes; les macles épais produisent des triangles, des cœurs, des marquises et des poires, tandis que les macles minces et les flats produisent les baguettes.

OBS

flat : terme anglais employé ainsi dans le commerce des diamants.

Spanish

Save record 1

Record 2 2006-08-17

English

Subject field(s)
  • Gemmology
  • Diamond Industry
CONT

Diamonds are subdivided into industrial, near-gem, and gem quality stones.... Industrial grade stones are used for a variety of purposes, but compete with synthetically produced industrial diamonds...

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
CONT

[Le diamant] est classé, selon sa qualité : industriel, quasi gemme ou gemme [...] Les pierres de qualité industrielle sont employées à diverses fins, mais elles sont concurrencées par les diamants industriels synthétiques [...]

Spanish

Save record 2

Record 3 2005-01-18

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

A larger diamond of high quality but poor colour(often yellow) that makes it unsuitable as a gem.

CONT

Crushing bort sells for about 30¢/ct; castings for $1/ct to $2/ct; industrial stones for $7/ct to $10/ct; flats (e.g., a high-quality thin macle) for $50/ct; and dies ... for up to $200/ct.

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
OBS

Une qualité de brut qui est jaune.

Spanish

Save record 3

Record 4 2005-01-18

English

Subject field(s)
  • Gemmology
  • Diamond Industry
CONT

Gem quality diamond. It is this type of quality which will be used in the jewellery industry. It must be of good color and of good clarity, its shape is not very important because the diamond must be cut.

CONT

When sawing gem diamonds, two different equipments can be used: the (traditional) saw in phosphor bronze or the laser beam saw.

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
CONT

Le diamant de qualité gemme. C'est ce type de qualité qui servira à la joaillerie et à la bijouterie. Il doit être de bonne couleur et de bonne pureté, sa forme quant à elle n'est pas très importante puisque le diamant doit être taillé.

Spanish

Save record 4

Record 5 2004-11-18

English

Subject field(s)
  • Gemmology
  • Diamond Industry
CONT

Synthetic diamond. A man-made diamond, produced either by subjecting carbon-bearing material such as graphite to high temperature and pressure or by the chemical vapor deposition(CVD) method. The Swedish company Allmana Svenska Elektriska Aktiebolaget(ASEA) is believed to have achieved the first repeatable synthesis of diamond in 1953, but their results were not published at the time; General Electric Company(GE) announced a successful synthesis of diamonds in 1954, followed by De Beers in 1959. Colors range from black to dark green, light green, red, yellow, blue, and colorless(Type IIa diamonds). Millions of carats of industrial-quality synthetic diamond are now manufactured annually using high pressure techniques; gem quality synthetic diamonds have been produced experimentally by De Beers Diamond Research Laboratories, General Electric Company...

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
CONT

Les diamants synthétiques sont fabriqués à partir de graphite et d'isotopes de carbone. La méthode de fabrication de ces synthèses repose sur les conditions de cristallisation naturelles du diamant, c'est-à-dire des températures entre 1700 °C et 2760 °C avec 10 T/cm², et ce pendant plusieurs mois.

CONT

[...] depuis 2003, la société américaine Génésis propose pour quelques milliers de dollars un diamant de synthèse jaune de 1,5 carat, forgé en trois jours et demi, comparable aux diamants naturels, mais trois fois moins cher.

Spanish

Save record 5

Record 6 2004-05-17

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

A natural diamond that has not been cut or polished.

OBS

It may be gem, industrial or boart quality.

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
DEF

Diamant naturel qui n'a pas été taillé.

Spanish

Campo(s) temático(s)
  • Estudio de las gemas
  • Industria del diamante
DEF

Diamante que aún no ha sido tallado.

Save record 6

Record 7 2004-04-23

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

A term describing rough gem material which has the weight, shape, clarity, and color to produce a polished stone suitable for use in jewelry.

CONT

Boart : An industrial diamond(not gem quality) ;used to prepare the scaife.

CONT

Diamond of gem quality.

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
DEF

Signifie qu'un diamant brut présente les caractéristiques nécessaires, poids, forme, pureté et couleur, pour être utilisé en joaillerie.

CONT

Diamant de qualité gemme.

Spanish

Save record 7

Record 8 2004-02-16

English

Subject field(s)
  • Precious Stones (Mining)
CONT

The quality of diamonds can be split broadly into gem, near gem, industrial and boart categories. In rare cases 90% of diamonds in a deposit are of gem quality; but most economic deposits contain 20 to 40% gem quality diamonds.

CONT

Diamonds are subdivided into industrial, near-gem, and gem quality stones.

French

Domaine(s)
  • Exploitation de pierres précieuses
CONT

Le diamant [...] est classé selon sa qualité : industriel, quasi gemme ou gemme.

Spanish

Save record 8

Record 9 2003-11-20

English

Subject field(s)
  • Precious Stones (Mining)
CONT

Diamonds are subdivided into industrial, near-gem, and gem quality stones.... Industrial grade stones are used for a variety of purposes, but compete with synthetically produced industrial diamonds...

French

Domaine(s)
  • Exploitation de pierres précieuses
CONT

[Le diamant] est classé, selon sa qualité : industriel, quasi gemme ou gemme [...] Les pierres de qualité industrielle sont employées à diverses fins, mais elles sont concurrencées par les diamants industriels synthétiques [...]

Spanish

Save record 9

Record 10 1998-06-29

English

Subject field(s)
  • Production (Economics)
  • Precious Stones (Mining)
CONT

It is expected that BHP Diamond Inc. 's production will be made up of mixed caratage and quality estimated at $120 per carat. The mixture is projected to be 30% gem, 40% near gem and 30% industrial, with over 20% larger than 2 carats. Valuations will be conducted on the rough diamond production. Legislation will require that the producer provide its rough diamond production in a form such that its value can be established.

French

Domaine(s)
  • Production (Économie)
  • Exploitation de pierres précieuses

Spanish

Save record 10

Record 11 1998-03-18

English

Subject field(s)
  • Private-Sector Bodies and Committees
  • Precious Stones (Mining)
OBS

The crisis of oversupply and weak demand of diamonds during the Great Depression led to the formation of the Central Selling Organization(CSO). The CSO is a group of companies associated with De Beers Consolidated Mines and De Beers Centenary AG to purchase, sort, evaluate, and market rough diamonds. Gem quality diamonds are sold through the Diamond Trading Company and industrial-grade material through De Beers Industrial Diamond Division. The CSO is also known as the Diamond Cartel.

French

Domaine(s)
  • Organismes et comités du secteur privé
  • Exploitation de pierres précieuses
OBS

Le groupe minier l'Anglo American, par le biais de sa filiale De Beers, exerce une domination sans partage sur le marché du diamant. Non seulement le groupe produit du diamant, mais par le biais de son bureau de vente CSO (Central Selling Organization, organisation centrale de vente), il a longtemps exercé un quasi-monopole sur sa commercialisation et en contrôle aujourd'hui encore un bon tiers.

Key term(s)
  • organisation centrale de vente

Spanish

Save record 11

Record 12 1977-09-30

English

Subject field(s)
  • Mineralogy
OBS

Hydrous phosphate of aluminum and sodium,(...), as yellow-green monoclinic crystals of gem quality, from Brazil. Named from the locality.

French

Domaine(s)
  • Minéralogie
OBS

Phosphate hydroxylé de sodium et d'aluminium cristallisant dans le système monoclinique. A été trouvé en quantité non négligeable dans certaines pegmatites du Brésil. Il se présente sous forme de cristaux prismatiques allongés et grossiers, souvent très brillants et transparents. Leur couleur varie du jaune d'huile au jaune verdâtre. Il peut être taillé comme les gemmes.

Spanish

Save record 12

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