This is a beautiful and bold chain link necklace by Fossil with a lobster claw clasp.  It is 18 inches long with a 2 inch extender. 
The links are round in shape and measure aprox 5mm across which gives it a real presence on the neckline and it catches the light .
It is 925 Solid Silver (please see hallmark in 2nd photograph) and quite heavy.
I have only worn it on a few occasions then it has been safely kept in my jewellery box.
From a smoke-free home.
Thanks for looking. :-)