How many letters does the top answer for “a little copper cup in which a diamond is held while being cut.” have?

The most common answer is doop (4 letters).

Crossword clue: a little copper cup in which a diamond is held while being cut.

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

doop 4 letters web-def

A little copper cup in which a diamond is held while being cut.

dop 3 letters web-def

A little copper cup in which a diamond is held while being cut.