Well, you have us beat...by about five years - congratulations! 
My input is wear whichever plaid your wife wants (Rule #1: Keep the Lady happy).
And there is absolutely no reason why a green stone would cancel the blue clergy -- it would only accent it -- should your wife choose that tartan.
Rob.
Rev. Rob, Clan MacMillan, NM, USA
CCXX, CCXXI - Quidquid necesse est.
If you can't say something nice, don't say nothing at all. (Thumperian Principle)
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