A barrier made of pretty stone (5)

I believe the answer is:

agate

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'pretty stone' is the definition.
'agate' can be an answer for 'stone' (agate is a type of stone). I'm not sure about the 'pretty' bit.

'a barrier' is the wordplay.
'barrier' becomes 'gate' (gate is a kind of barrier).
'a'+'gate'='AGATE'

'made of' is the link.

Can you help me to learn more?

(Other definitions for agate that I've seen before include "Ornamental form of quartz" , "Quartz with bands of colour, used in jewellery" , "Semi-precious quartz" , "Decorative stone" , "Type of quartz" .)

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

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