This is what ours looks like today. It used to be a 1.5" Golden Key with (i think) 7 Teal gems on it. I'd like the 7 dots that make up the flower on our crest to be diamonds. but we haven't made the diamond our official gem yet, and I'm just happy to have the pins we have.
We get ours through
TerryBerry
They are pretty inexpensive and come in different varieties. We can get ours in gold (white or yellow) plated, sterling silver, 10K gold, or 14k gold. The prices ranged in that order from $23-$130. Most of us have ours in sterling silver and received it upon initiation as part of our Associate Member dues.
Our Associate Member pins are teal black and white ribbons tied in a bow with a gold key dangled from the center. I hated it at first, but then I loved it because everyone would be like...what is the ribbon for? and I'd tell them about Sigma Psi Kappa.