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Honestly, go with Glinting Noble Topaz, it's a better cut (for rogues) of the same gem. A gem with str on it is a poor choice no matter what you're looking for. If you don't need the socket bonus, you can just go with 8 crit gems. I'm assuming it's a red socket as you would probably already be doing this if it was yellow. I'd definitely consider either the gem I linked or the 8agi cut over anything with str on it... even if it does give crit. The 8agi gem will give you the same amount of crit as that gem, twice the AP, and some dodge... as well as armor if you care...
Glinting Noble Topaz is not my option, min 35g+ for this, and I don't think I'll spend the golds on this. +8 crit gems are my all time favorite, but not available most of the time too. :(
I really hope the gem market can go lower, blue gem cost min 40g+ usually, sigh.