Yes, boy, makes gemstones weary (5)

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.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.