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Weight Estimation Formula

Colored Gemstone Weight Calculation Formula

Approximate Estimated Carat Weight = Length x Width x Depth x Specific Gravity (SG) x Shape (SF) x (1 + Weight Correction Factor (WCF))

x x x

x

x ( 1 +

)

Approximate Estimated Carat Weight :

Select one Specific Gravity option:

Select one Shape option:

Round Faceted-0.00200
Round Cabochon-0.00270
Oval Faceted-0.00210
Oval Cabochon-0.00270
Cushion Faceted-0.00235
Cushion Cabochon-0.00290
Pear Faceted-0.00200
Pear Cabochon-0.00245
Marquise Faceted-0.00190
Marquise Cabochon-0.00240

Heart Faceted-0.00195
Heart Cabochon-0.00250
Princess & Baguette Faceted-0.00290
Radiant Faceted-0.00260
Emerald Faceted-0.00270
Rectangular Step Faceted-0.00300
Square Princess Faceted-0.00250
Square Emerald Faceted-0.00230
Square Cushion Faceted-0.00235
Square Cushion Cabochon-0.00300

Select one Weight Correction Factor option:

-25%
-20%
-15%
-10%
-5%
0%
5%
10%
15%
20%
25%

30%
35%
40%
45%
50%
55%
60%
65%
70%
75%

Diamond Weight Calculation Formula

Approximate Estimated Carat Weight = Length x Width x Depth x Shape (SF) x Girdle Correction Factor (GC) x Weight Correction Factor (WCF)

x x x

x

x

Approximate Estimated Carat Weight :

Select one Shape option:

ROUND BRILLIANT- 0.0061
PRINCESS CUT -0.0085
ASSCHER STEP CUT -0.0080
CUSHION BRILLIANT -0.00815
HEART BRILLIANT -0.0059
TRILLION BRILLIANT -0.0057
MARQUISE BRILLIANT (1^1/2: 1 ratio)-0.00565
MARQUISE BRILLIANT (2: 1 ratio)-0.0058
MARQUISE BRILLIANT (2^1/2: 1 ratio)-0.00585
PEAR BRILLIANT (1^1/4: 1 ratio)-0.00615

PEAR BRILLIANT (1^1/2: 1 ratio)-0.0060
PEAR BRILLIANT (2: 1 ratio)-0.00575
OVAL BRILLIANT (1^1/4: 1 ratio)-0.00625
OVAL BRILLIANT (1^1/2: 1 ratio)-0.0064
OVAL BRILLIANT (2: 1 ratio)-0.0067
EMERALD STEP CUT (1^1/2: 1 ratio)-0.0092
EMERALD STEP CUT (2: 1 ratio)-0.010
EMERALD STEP CUT (2^1/2: 1 ratio)-0.0106
RADIANT BRILLIANT (1: 1 ratio)-0.0081
RADIANT BRILLIANT (1^1/2: 1 ratio)-0.0084

Select one Girdle Correction Factor option:

From "Thin" To "Medium" - 1.00
"Slightly Thick":
(ROUND BRILLIANT below 1.25cts) - 1.025
(ROUND BRILLIANT above 1.25cts) - 1.015
(FANCY SHAPES)- 1.035
"Thick":
(ROUND BRILLIANT below 1.25cts) - 1.035
(ROUND BRILLIANT above 1.25cts) - 1.025
(FANCY SHAPES) - 1.06
"Very Thick":
(ROUND BRILLIANT below 1.25cts) - 1.075
(ROUND BRILLIANT above 1.25cts) - 1.05
(FANCY SHAPES) - 1.095
"Extremely Thick":
(ROUND BRILLIANT below 1.25cts) - 1.10
(ROUND BRILLIANT above 1.25cts) - 1.07
(FANCY SHAPES) - 1.11

Select one Weight Correction Factor option:

Has Squamish or High Shoulders and Shape is "Pear" - 1.03
Has Squamish or High Shoulders and Shape is "Oval" - 1.055
Has Wide or Fat Wings and Shape is "Pear" - 1.055
Has Wide or Fat Wings and Shape is "Marquise" - 1.055
Has Large Culet, +1.015
Has Wide Corners and Shape is "Emerald" - 0.97
Has Wide Corners and Shape is "Radiant" - 0.97
Has Pavilion Bulge and Shape is "Emerald", "Radiant", or "Trillion" - 1.08

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