Crossword Genius

Gem given polish, sparkly finally (4)

Ross

I believe the answer is:

ruby

'gem' is the definition.
(ruby is a kind of gem)

'polish sparkly finally' is the wordplay.
'polish' becomes 'rub' (polish meaning rub to make shiny**).
'finally' suggests the final letters.
The final letter of 'sparkly' is 'y'.
'rub'+'y'='RUBY'

'given' is the link.

(Other definitions for ruby that I've seen before include "Stony girl" , "Deep 6 across" , "A red jewel" , "Completely" , "Girl's name - colour" .)

I've seen this clue in The Telegraph.
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