Culet Bottom Facet on a Gemstone
Culet from "Culus" Meaning "Bottom"
Culet correctly pronounced "kyoo-lit" comes from the Latin "culus" meaning "bottom".
The culet is the facet at the bottom of a cut gemstone although not all faceted gemstones have one.
In some gemstones the culet is closed which means the tip comes to a sharp point. Although a closed culet actually means there's no culet at all, many still refer to the pointed tip of a faceted gemstone as being the culet.