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PRECIOUS STONES.
be arranged into the two groups (1) those having plane surfaces; (2) those having curved surfaces: but, under special circumstances, facets or plane surfaces are occasionally associated with curved surfaces in the same specimen. The further subdivision of the two groups of forms may be tabulated thus:
Group 1. Plane surfaces | Brilliant-cut. | |
Step or trap-cut. | ||
Table-cut. | ||
Rose-cut. | ||
Group 2. Curved surfaces | Single cabochon. | |
Doable cabochon. | ||
Hollowed cabochon. | ||
Tallow top. |
A few words descriptive of each of these modes of cutting stones may now be given.
The old brilliant-cut, though susceptible of many small modifications as to the size of the facets, their mutual proportions and inclinations, and even their number, requires, when perfect, 58 facets thus arranged:
Fig. 12. | ||
1 Table | The "Crown," or upper part of the brilliant. | |
8 Star facets | ||
4 Templets or bezels | ||
4 Quoins or lozenges | ||
8 Cross or skew facets[1] | ||
8 Skill facets[1] | ||
33 |