Carat Weight Calculator from Dendritics

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Carat Weight. Given the cut and dimensions of a stone, estimate its weight in Carats. Optimized on over 1,000 individual gemstones.  A full 300 stones to choose from.   All measurements in mm and Carats.

Stone Identification. Given the dimensions and the weight, we estimate the specific gravity of your stone and produce a guess at its identity. All measurements in mm and Carats.


Cut

Round-Facet
Emerald
Square1
Heart3
Pear3
Rect-Cush1
Rectangular1
Rect-Step1
Square-Cush2
Marquise
Oval-Facet
Navette1
Square-Step1
Radiant
Cabochon4
Trilliant
Octahedron4
Spheroid4

Girdle

From   

To     

Measurements

Length

Width 

Depth 

Select your Stone

(Common stones listed first, then others)

~or~

Weight in ct

Culet

Sides

 

Color

 

Belly Shape

 

Table

mm

 

Notes

1 This uses the relatively crude Standard Formula, with larger indicated uncertainty than on other cuts. You need only enter the basic Measurements and Belly Shape.
2 Square cushion. Enter corner & belly measurements as Length and Width. Also uses the Standard Formula. You need only enter the basic Measurements and Belly Shape.
3 Side Shape. Enter curvature of sides, used only for Pear and Heart cuts (so far).
4 Cabochon, Spheroid and Octahedron. You need only enter the basic Measurements.

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