Who Can Help Me Identify This Necklace?

by Marga Dobma
(The Netherlands )

This necklace is I suppose made of lacked iron with hardly no weight (32 gr.) and looks like lace.

I purchased it at an antique shop as a mourning necklace.
I think and hope of course that this is a so-called Berlin Iron necklace, but I'm not sure because I've never actually seen one in real life. Who gives me a clue? Thanks in advance!