This concho is square and measures 1-1/4", just the concho itself. 
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.   There are tiny air bubbles visible in the photograph.  There usually are not this many bubbles.  But regardless, even though they are very visible in this photograph, you hardly even notice them when looking at the pendant in person. 

Order the pendant, then send me a jpg picture by email and I'll personalize the concho with any picture of your choice!   The image will be placed on the concho however you send it to me; for example, full color ~ unless you tell me otherwise.  If you want black and white or sepia, just let me know.