Cryptic crossword clue
Appealing refusal, returned gemstones 6

The most common and most likely answer to this crossword clue is the 6 letter word ONYXES

O
N
Y
X
E
S

Buddy explains!

The straight part
We know that "gemstones" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gemstones = onyxes.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does ONYXES mean?

ONYXES noun
  1. A banded variety of chalcedony, a cryptocrystalline form of quartz.
  2. A jet-black color, named after the gemstone.
  3. Any of various lycaenid butterflies of the genus Horaga.

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