Glossary of watchmaking - Fondation de la Haute Horlogerie

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Agate

Agate (s) | 瑪瑙／メノウ | 玛瑙

A variety of the quartz group that exists in many different colours and is opaque. This ornamental...

Alloy

Alliage | 合金／ゴウキン | 合金

Combination of two or more pure molten metals. Generally, an alloy is given the name of the...

Asterism

Astérisme | 星彩効果／セイサイコウカ | 星彩

An optical phenomenon of intersecting lines in a star formation, caused by the reflection of light...

Baguette

Baguette | バゲットカット | 方钻

The cut of a gemstone stone that has been cut into a long, rectangular shape. The word baguette...

Beryl

Béryl | ベリル | 绿宝石

A family of stones that share the same crystalline and chemical properties. Varieties include the...

Bezel or collet setting

Serti clos ou serti rabattu | ベゼル（コレット）・セッティング | 宝石座镶嵌

The stone is encircled by a strip of metal which is pressed over so as to extend slightly over the...

Birefringence

Pierre biréfringente | 複屈折性／フククッセツセイ | 双光折射

The property of all stones, except those of the cubic crystal system (diamond, garnet and spinel),...

Bort

Bort | ボルツ | 钻石粒

Industrial diamond that is used for polishing.

Brilliant cut

Taille brillant | ブリリアントカット | 明亮式切工

A round diamond that is cut with 57 or 58 facets or 32 facets + plus the largest facet called the...

Briolette

Briolette | ブリオレット | 椭圆形钻石

A drop shaped gemstone cut that has many triangular facettes.

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