Cryptic crossword clue
Like some gems? Rue cost that’s ruinous 4-3

The most common and most likely answer to this crossword clue is the 8 letter word ROSE-CUT

I've seen this crossword clue in The Guardian
R
O
S
E
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C
U
T

Buddy explains!

The straight part
We know that "Like some gems" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like some gems = 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
  1. Cut flat on the reverse, and with a convex face formed of triangular facets in rows; said of diamonds and other precious stones.

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