the.com/culet

the tiny flat tip on a diamond's bottom that exists mostly to not chip

means The culet is the small facet (or point) at the very bottom of a cut gemstone, where the pavilion facets meet — sometimes a tiny flat, sometimes nothing at all.

from From French 'culet,' a diminutive of 'cul' meaning 'bottom' or 'rear' (from Latin 'culus,' the backside). So the word literally names the diamond's 'little bottom' — fittingly, since it sits at the lowest point of the stone. The same root quietly underlies words like 'de-cul' and the indelicate French 'cul-de-sac,' literally 'bottom of the bag.'

location
The lowest point of a cut gemstone
modern trend
Often cut to an invisible point now
old cuts
Antique diamonds had large visible culets
armor cousin
Culet also names a plate guarding the buttocks
grading note
Large culets lower a diamond's grade
for instance

cullet glass recycling — recycled glass crushed into small pieces, makes up 20-40% of new container glass production

diamond culet — small flat facet at the bottom of brilliant-cut diamonds, reduces chipping during setting

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