How many letters does the top answer for “green chalcedony with red spots that resemble blood” have?

The most common answer is bloodstone (10 letters).

Crossword clue: green chalcedony with red spots that resemble blood

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

bloodstone 10 letters wn-def

green chalcedony with red spots that resemble blood

heliotrope 10 letters wn-def

green chalcedony with red spots that resemble blood