Pear Shape Approximate carat weight of a Pear Shape diamond=Length x Width x Depth x 0.0062   The above weight formula provides an estimate. The actual weight may vary up to 10%, depending on the make, girdle thickness, and accuracy of the measurement tools. A nice make for a Pear Shape diamond is a 1.5:1 ratio. 1.8:1 is considered long, and 1.3:1 is considered to be too fat. (See Table and Depth Percentage Formulas.)   Oval Shape Table of Contents Encyclopedia Home Introduction The 4 C's Terminology Depth and Table Percentages How to use The Diamond Buying Guide GIA, AGS, & Commercial Grade Conversion Charts Round Brilliant , Brilliant, Old Mine Cut Pear and Oval Cuts Marquise Cut Heart Shape Princess and Radiant Cuts Emerald, Cushion, and Carre Cut Trillions   Approximate carat weight of an Oval Cut diamond=Length x Width x Depth x 0.0067 The above weight formula provides an estimate. The actual weight may vary up to 10%, depending on the make, girdle thickness, and accuracy of the measurement tools. A nice make for an Oval Cut diamond is a 1.5:1 ratio. 1.7:1 is considered long, and 1.3:1 is considered to be too fat. (See Table and Depth Percentage Formulas).