Crossword Genius

Ruby and Jules on the radio - what's the quality of the sound?

Ross

I believe the answer is:

gemstone

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'ruby and jules on the radio' is the definition.
I can't tell whether this defines the answer.

'the quality of the sound?' is the wordplay.
'the quality of' becomes 'gems' (I can't explain this - if you can you should give a lot more credence to this answer).
'the sound?' becomes 'tone' (tone is a kind of sound).
'gems'+'tone'='GEMSTONE'

'what's' acts as a link.

Can you help me to learn more?

(Other definitions for gemstone that I've seen before include "Physical power" , "Jewel" , "It's considered precious" , "Piece of crystalline rock as jewellery" , "Emerald or ruby" .)

I've seen this clue in the Irish Times.
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