The best diamonds swapped for alpinist's implement (3-4)

I believe the answer is:

ice-pick

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'alpinist's implement' is the definition.
'ice pick' can be an answer for 'implement' (ice pick is a kind of implement). I'm not sure about the 'alpinist's' bit.

'the best diamonds swapped' is the wordplay.
'the best' becomes 'pick' (the best possible pick or selection).
'diamonds' becomes 'ice' (slang term for diamonds).
'swapped' means one lot of letters go next to another.
'pick' put after 'ice' is 'ICE-PICK'.

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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