I was just fishing around for something else on ebay when I ran across a pin which looked like it *might* be a Sigma Kappa pin. I've never seen one like it before, and the seller is asking $100 for it! S/he is calling it a "Delta Sigma Kappa" pin, but it looks suspiciously like a sigma and a kappa set within a triangle set within a circle of pearls. The auction is now closed (no one bid on it) but you might still be able to view the info at:
It's definitely a mother's pin. It looks like what's described in my promise book. But the ones that you can get now are gold gloss, small, and no pearls. But their only $12!