This concho is square and measures 1-1/4", just the concho itself. 

Large picture concho pendant is available, too.  Measures 2-1/4"  Look under the Concho Pendant tab.

Sticking up from the concho is the front side of a concho pendant adapter.  On the backside of the adapter, it is in the shape of a hook, so that you can easily attach this pendant to almost any necklace.   Order the pendant, then send me a jpg picture by email and I'll personalize the concho with any picture of your choice!