CS 9 Flashcards
Rough that’s ground to the approximate shape of the finished stone is called
preforn
Which type of rough is usually faceted?
Transparent
To judge brilliance, view the stone
face-up
Translucent to opaque rough is often cut into a
Cabochon
Colored stones cut flat with shallow pavilions usually have areas of lower color intensity called
windows
To retain as much weight as possible from rare, high-quality rough, cutters would most likely vary
proportions
Important factors in evaluating a faceted gem’s proportions are its crown and pavilion depths and
the symmetry of its profile and its face-up outline
A carved design that projects slightly from a flat or curved surface is called a(n)
cameo
Which colored stone variety has cutting challenges due to vulnerable cleavage planes?
Tanzanite
Removing heavily included sections from gemstone rough by carefully tapping it with a small hammer is known as
cobbing
Which cutting stage has the greatest impact on the value of the finished gem?
preforming
Which is most likely to undergo cobbing?
Commercial-quality amethyst rough
When viewed face-up, a stone with more than 75 percent brilliance is considered to have
excellent proportions.
Excessive bulge on a step cut
adds weight
Cutters can darken the color of pale stones by cutting a
deep pavillion