Diamond Information Culet
The culet is the point at the bottom of the diamond. Sometimes diamond cutters have to cut the point off and make a flat facet. The facet is measured in terms of size and can be either small, medium or large. Ideally a pointed (none) culet is preferable as a stone with a large culet can be noticed when veiwed through the table.
Marcel Tolkowsky was a pioneer in the world of diamonds, and was the first person to present a mathematical analysis of diamond cut. In 1919 he released the 'Diamond Design' , A study of the reflection and refraction of light in a diamond. He concluded that a diamond , having the most perfect fire and brilliance should have a single set of proportions. A diamond with no culet and an extremely thin girdle should have a 53% table, crown angle 34.5° , crown height 16.2% , pavillion angle 40.75° , pavillion depth 43.1% and an overall total depth of 59.3% . One must remember though that Tolkowsky's set of proportions will be different for any diamond that has a culet or a thicker girdle
