how to facet
gemstone main cabochon creation
min data

Mineral: quartz
Gem: citrine
Size: 11x15 mm
Carat: 6.6 ct
Cut: concave cut
Origin: unknown
Genral Info: The name is derived from the German "quarz" of uncertain origin. It was called "krystallos" by the Greeks, but this later became the generic term for crystal.
Additional Information
This is a bicolor piece of quartz that has a traditional facet cut on the top, but is finished with a series of concave facets on the back. Each side of the center line has concave facets running parallel to those on the opposite side. The net effect is a herringbone like pattern coming through the top of the stone.

The crossing effect is created by each set of side bars being reflected in the opposite side. The stone was cut in Hong Kong by the SM Gem Group. See closeups below for more detail. It is likely (although not positive) that the stone is synthetic quartz due to the precise and very straight color change line.

Top of stone shows the "hearingbone" pattern. Bottom of stone show two sets of facets running parallel to each other.
Closeup of bottom shows the concave nature of he bottom facets along an edge.