The most common and most likely answer to this crossword clue is the 4 plus 3 letter word ROSE CUT
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Buddy explains!
The straight part
We know that "Describing some stones" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case describing some stones = rose cut.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 ROSE CUT mean?
ROSE CUT adjective- Cut flat on the reverse, and with a convex face formed of triangular facets in rows; said of diamonds and other precious stones.