Susan ward dating

The blade is very thin and made of copper, bronze, or steel.The specimen is hand fed into the saw or clamped into a vise and fed mechanically.The purpose of cutting a gemstone is to maximize the beauty.In general, transparent gemstones are faceted to enhance interaction with light, thus improving the brilliance (amount of light reflected), scintillation (sparkle and flashes), and fire (spectral colors).A slab of the gem material is cut to the desired thickness.After sawing the gem, grinding, sanding, and polishing will finish the operation.

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Advanced machinery and techniques would eventually give rise to improved cabochon cuts and faceting, which is more dependent upon the physical and optical properties of gem rather than the shape.When water is added to the center of the moving plate, the resulting slurry grinds and polishes the sawn specimens to a flat surface.These slabs could be finished as book-end sections or readying the specimen for cabbing.The hollow cabochon has a convex top and flat bottom, but the dome is hollowed out and polished.This concave surface enables better light transmission in dark stones.

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