Education
Proportionscope (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...
Proportionscope (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...
Crown Angle (5.10)
At 34½˚, the angle of dispersion is at its greatest. At 30˚ one would have to look in a more parallel direction to the table of the diamond to observe...
Crown Angle (5.10)
At 34½˚, the angle of dispersion is at its greatest. At 30˚ one would have to look in a more parallel direction to the table of the diamond to observe...
Pavilion Angle (5.09)
The original ideal pavilion angle is 40.75˚. A steep pavilion angle will allow the light to fall within the 24.5˚ critical angle therefore exiting unnecessarily.
Pavilion Angle (5.09)
The original ideal pavilion angle is 40.75˚. A steep pavilion angle will allow the light to fall within the 24.5˚ critical angle therefore exiting unnecessarily.
The Critical Angle (5.08)
The critical angle in a diamond is 24.5˚ which allows that approach of the light to enter the diamond. After the light enters the diamond the 24.5˚ is avoided so it...
The Critical Angle (5.08)
The critical angle in a diamond is 24.5˚ which allows that approach of the light to enter the diamond. After the light enters the diamond the 24.5˚ is avoided so it...