Crossword Genius

I, perhaps (anag) — a stone … (8)

Ross

I believe the answer is:

sapphire

(Other definitions for sapphire that I've seen before include "Precious transparent stone of blue corundum" , "A gem; I, perhaps (anag.)" , "Precious thing" , "Blue gemstone" , "Blue gem" .)

I've seen this clue in The Guardian.
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