This item is new in the box with tags.  It is adjustable in length.  The 4th picture show how you can slide it to make it shorter or longer.  The longest is a little over 16 inches in length not including the pendant portion.

I am not sure what the red it, but it appears to be stone or glass.  Beautiful pendant and I have several.  I am enabling volume discount and combined shipping.   

These were designed in France but made in China.