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GLOSSARY 425
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Exotic-fragments.— Inclusions of foreign rock unlike surrounding reef, found in diamond chimneys.
False color.— Diamonds showing different tints of color in different lights.
Fancies.— Diamonds of fine and decided colors.
Feathers.— White, subtransparent lines in the body of the stone.
Fish-eye.—Diamond cut too thin to secure the angle of total reflection from the interior facets.
Flats.— Thin diamond crystals or parts of crystal used for draw-plates.
Floating-reef.— Inclusions of surrounding reef in the rock of the diamond chimneys.
Floors.— Level stretches of ground on which the diamondiferous rock of the African Mines is weathered.
Girdle.— Edge of brilliant-cut diamond at junction of pavilion and bizel: greatest circumference edge.
Glassies.— Transparent diamond crystals.
Glassy.— Diamonds lacking sharpness of brilliancy.
Glaziers' diamonds.— Small diamonds or corners of diamond crystals, used for glass cutting.
Glessen.— Semi-transparent fissures in diamonds. Feathers.
Golcondas.— Indian diamonds, as generally applied.
Gorgulho.— Diamondiferous quartz and clay gravel of Brazil.
Grain marks.— Lines on the facet surfaces due to imperfect polishing.
Grupiaras.— Shallow deposits of diamondiferous gravel on the river hills of Brazil.
I. D. B. Act.— A law passed in Cape Colony, South Africa, making illicit diamond buying a criminal offense.
Jagers.— Fine white diamonds, tending to a blue tint.
Kimberlite.— A serpentive breccia named after Kimberley, where it
was discovered as a diamond-bearing rock. Knife-edge.— The girdle of a diamond cut to a sharp edge. Kopje.— A small hill in the Boer country of Africa.
Lumpy.— Said of stones cut too thick.
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