Cryptic crossword clue
Polish face of yellow gemstone 4

The most common and most likely answer to this crossword clue is the 4 letter word RUBY

R
U
B
Y

Buddy explains!

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

RUBY noun
  1. A clear, deep, red variety of corundum, valued as a precious stone.
  2. A red spinel.
  3. A deep red colour.
  4. The tincture red or gules.
  5. The size of type between pearl and nonpareil, standardized as 5½-point.
  6. A ruby hummer, a South American hummingbird, Clytolaema rubricauda.
  7. A red bird-of-paradise, Paradisaea rubra.
RUBY verb
  1. To make red; to redden.
RUBY adjective
  1. Of a deep red colour.
RUBY noun
  1. A pronunciation guide written above or beside Chinese or Japanese characters.

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