There are as many different shapes and styles of collar as there are people who wear them.
And this is the blurb for Turquoise and Leather:
An untrained submissive might not be what George wants, but Eric could be just what George needs.
George McAllister knows better than to hook up with an untrained submissive. He doesn’t have the patience to guide a novice through his first kinky experiences. His lovers have to know what they are doing and do what they are told. When he sees Eric dancing on top of a table in a kinky club, he assumes the beautiful young man is an experienced submissive. Then he sees the turquoise and leather on his neck and recognises it as a collar. Someone else already owns Eric. George has no choice but to walk away.
Eric Jordan doesn’t know much about kink and he has no idea why George is suddenly less than enthusiastic. But he knows what he wants and if he has to chase after George to get it, so be it. If George wants to believe the pretty bit of rock on his necklace means something kinky, that’s fine. But Eric doesn’t belong to anyone but himself and he won’t give up possession of himself for one night in George’s bed.
An untrained submissive might not be what George wants, but he could be just what George needs.
And I think that is it for today. I still have promo work to do, and my writing for the day, and it's just gone ten pm, so I'd better get to it!