Education

Table Reflection Method (5.17)

The Table Reflection Method furnishes a fast and relatively accurate estimate of pavilion depth.  The size of this reflection indicates the depth of the pavilion in question.

Table Reflection Method (5.17)

The Table Reflection Method furnishes a fast and relatively accurate estimate of pavilion depth.  The size of this reflection indicates the depth of the pavilion in question.

The Pavilion Depth (5.16)

The pavilion depth is not the same as the pavilion angle. Arriving at the pavilion depth.

The Pavilion Depth (5.16)

The pavilion depth is not the same as the pavilion angle. Arriving at the pavilion depth.

Estimating Pavilion Angle (5.15)

The original preferred pavilion angle of 40.75° corresponds to a pavilion depth percentage of approximately 43%.

Estimating Pavilion Angle (5.15)

The original preferred pavilion angle of 40.75° corresponds to a pavilion depth percentage of approximately 43%.

The Pavilion Main Method (5.14)

Estimating crown angles with the Pavilion Main Method.

The Pavilion Main Method (5.14)

Estimating crown angles with the Pavilion Main Method.

Judging Crown Angles (5.13)

Judging diamond crown angles.

Judging Crown Angles (5.13)

Judging diamond crown angles.

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...