Cryptic crossword clue
Don's X-ray reveals stone 8

The most common and most likely answer to this crossword clue is the 8 letter word SARDONYX

S
A
R
D
O
N
Y
X

Buddy explains!

The straight part
We know that "stone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stone = sardonyx.
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 SARDONYX mean?

SARDONYX noun
  1. A gemstone having bands of red sard; a variety of onyx or chalcedony.
  2. A tincture of sanguine colour when the blazoning is done by precious stones.

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