TERMIUM Plus®

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CROSS-WORKING [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2007-01-19

English

Subject field(s)
  • Gemmology
  • Diamond Industry
CONT

Describe crossworking: a) establishes symmetrical crown and pavilion main facets to specific angles and indices b) consists of two steps: - blocking the diamond ... lapping the diamond ...

CONT

Polishing: Removing material from a diamond to form facets; done in stages; crossworking (to set main facets), brillianteering (to finish the diamond); also referred to as cutting, grinding, running and smoothing.

OBS

blocking :[The] process of placing the table, the first four facets on the crown, and the first four facets on the pavilion of a rough or prepared diamond. To a large extent, blocking determines the symmetry and weight of the polished diamond as well as its brilliance and dispersion. In stones under 50 points, the process is often combined with cross-working.

Key term(s)
  • cross working
  • cross-working

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
DEF

Taille des facettes principales de couronne et de culasse à des angles et positions spécifiques.

Spanish

Save record 1

Record 2 2004-05-17

English

Subject field(s)
  • Industrial Tools and Equipment
  • Diamond Industry
DEF

A round, cast-iron disc charged with diamond powder used to polish a diamond.

CONT

The same scaife is used for all of the steps of faceting and polishing. The coarsest abrasives are placed in the center and the abrasives become finer as they reach the outside edge. Brillianteering and polishing take place farther out on the scaife than blocking and cross-working.

OBS

lap: The rotary metal or wooden disc (sometimes surfaced with cloth or leather) used by lapidaries for polishing gemstones. For diamond polishing the lap is made of cast iron and is called a scaife or a mill.

Key term(s)
  • scaif
  • skeif
  • skaif
  • scaive

French

Domaine(s)
  • Outillage industriel
  • Industrie diamantaire
DEF

Plateau en fonte enduit de poudre de diamant servant à la taille et au polissage.

CONT

Une meule de diamantaire comporte une zone de taille, où la surface du diamant est en quelque sorte rabotée par arrachage de matière, et une zone de polissage, où la facette formée est polie par abrasion des irrégularités de l'usure précédente (à l'aide de poudre d'une granulation plus fine).

CONT

Pour tailler les facettes, on fixe le diamant dans un dop [qui] est posé sur la meule de fonte poreuse garnie de poudre de diamant. Cette meule horizontale tourne à grande vitesse. Le diamantaire appuie sur son dop pour user un peu le diamant, puis, d'un geste vif, il relève le dop et contrôle à la loupe que le début de facette se forme bien [...]

OBS

Disque [...] tournant généralement horizontalement.

Spanish

Save record 2

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