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Glossary of watchmaking

Lapis lazuli

Lapis-lazuli | ラピスラズリ | 天青石

Lapis lazuli

A rich blue opaque gemstone often used in watch dials. It is specked with pyrite that looks like gold. Lapis has a hardness of 5.5; it has a specific gravity of 2.4 to 2.9. Lapis lazuli is not a mineral but a rock that contains the minerals lazurite, calcite and hauynite