Crossword Genius

Yes, boy, makes gemstones weary (5)

Ross

I believe the answer is:

jades

I'm a little stuck... Click here to teach me more about this clue!

'gemstones weary' is the definition.
I can't tell whether this defines the answer.

'yes boy' is the wordplay.
'yes' becomes 'ja' (I can't justify this - if you can you should give a lot more credence to this answer).
'boy' becomes 'Des' (short for Desmond).
'ja'+'des'='JADES'

'makes' acts as a link.

Can you help me to learn more?

(Other definitions for jades that I've seen before include "Worn-out horses" , "Worthless nags" .)

I've seen this clue in the Evening Standard.
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