Emerald Cut Estimation (11.16)
L/W ratio LWA
1.00/1.00 .0080
1.50/1.00 .0092
1.75/1.00 .0097
2.00/1.00 .0100
2.25/1.00 .0104
2.50/1.00 .0106
Emerald Cut Formula:
Length x Width x Depth x LWA x GTA
#1 Example of formula in use:
Length measurement: 7.86 mm
Width measurement: 5.25 mm
Depth measurement: 3.86 mm
Girdle: Medium+
Pavilion bulge: 1.04
L/W Ratio: 7.86 divided by 5.25 = 1.497, rounded to 1.50. Referring to the 1.50/1.00 LWA, .0092 is assigned.
Since the girdle average was determined medium+ referring to the GTA list for a 5.25 mm diameter 1.01 is assigned.
Formula will read:
7.86 x 5.25 x 3.86 x .0092 x 1.01 x 1.04 = 1.539
Rounded to 1.54 ct.
#2 Example of formula in use:
Length measurement: 7.23 mm
Width measurement: 4.89 mm
Depth measurement: 3.25 mm
Girdle: Thick
Slight pavilion bulge: 1.02
L/W Ratio: 7.23 divided by 4.89 = 1.478 rounded to 1.48. Referring to the 1.50/1.00 LWA, .0092 is assigned.
Since the girdle average was determined thick referring to the GTA list for a 4.89 mm diameter, 1.03 is assigned.
Formula will read:
7.23 x 4.89 x 3.25 x .0092 x 1.03 (GTA) x 1.02 shape adjustment = 1.109
Rounded to 1.11 ct.
