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Wednesday, 19 September 2007

fire. Flashes of the different spectral colors seen in Diamonds and other Gemstones as the result of dispersion. See dispersion.

first bye. A color-grading term used at the mines to indicate the finest quality of byewater stones. See bye.

first water. See water.

fisheye. A diamond whose pavilion is exceedingly shallow, producing a glassy appearance and a noticeable dearth of brilliancy. Girdle reflection appears inside the table of the stone

when viewed through the table. See


fissure. An elongated cavity in a diamond's surface. It may or may not have occurred along the line where a cleavage reached the surface.

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