culasse
Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License
- noun The lower faceted portion of a brilliant-cut diamond.
Examples
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It is a remarkably excellent imitation -- silicate of alumina; the weight, color, and hardness, the measurements -- table, girdle, and _culasse_ -- all correspond exactly with the original.
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This portion is called the "girdle," and if we take this as a defining line, that portion which appears above the setting of this girdle, is called the "crown"; the portion below the girdle is called the "culasse," or less commonly the "pavilion."
Note
The word 'culasse' comes from a French word meaning 'back'.