What is this? +

[RRfromR]

It also has a name on it and 585. Thank you!

 

[ItsMainelyYou]

It looks like a tie clip?

 

[Diamond Girl 21]

I think 585 means it's 14kt gold.

 

[YadaYadaYada]

I agree with @ItsMainelyYou, looks like a tie clip.

 

[stracci2000]

And the chain attaches to your shirt button.
A very classy look!

 

[Catmom]

It's a tie clip. The back piece hooks on a button to keep the tie from flopping.