Education
Proportion Analyzers (5.12)
The proportionscope, first designed and manufactured by GIA in 1967, is an instrument that casts a silhouetted image of the diamond It allows us to check the proportions of the...
Proportion Analyzers (5.12)
The proportionscope, first designed and manufactured by GIA in 1967, is an instrument that casts a silhouetted image of the diamond It allows us to check the proportions of the...
Cut Grade (5.42)
The research of the cut grade system by GIA included a ray-tracing program and computer modeling programs. Eventually it came down to human observation.
Cut Grade (5.42)
The research of the cut grade system by GIA included a ray-tracing program and computer modeling programs. Eventually it came down to human observation.
Crown Angle (5.10)
At 34 ½˚, the angle of dispersion is excellent but as GIA has formulated there are many other variations that are acceptable for an excellent cut grade. At 30˚ one...
Crown Angle (5.10)
At 34 ½˚, the angle of dispersion is excellent but as GIA has formulated there are many other variations that are acceptable for an excellent cut grade. At 30˚ one...