late biedermeier to historism brooch

                   

the brooch was part of an ugly hat my girl bought herself on this weekends fleamarket for an euro
she didn't even realized it's a good piece of jewelry, just thought it's not looking good at her new hat.
it's 5cm in height and very well made and should be from about 1860-70 i believe.
i've been at an antique dealers shop yesterday and have tested the purity there.
the gold part is somewhere between 750 and 900...
the friendly man said the flower with the diamond and the cord surrounding the golden part might be platinum because silver should be more patinated.
he said white gold hasn't been used these days?
he hasn't got a platinum test...
any clues if it might be platinum?

realism morning brooch, you are right as usual
been at his shop again... the needle is between 750 and 900
the brooch at least 585 and the rose is to close to the onyx to get tested without the danger to damage something...
it should be silver i guess...
not white gold which really hasnt been used at that time.
and i have read that platinum has been rarely used as well...
they've normally throwed platinum away because they have thought that it is half finished gold and worthless at around 1850-1870
an infos if this is true?

maybe i should try to cut of a slim stripe of slate to get it tested though.... would be easier to rub off a little of the flower if i do...

Hello!

Its definitely a later Victorian mourning brooch, by the pin I would date it to around 1880-1890 maybe a bit later as the pin is quite thin and the hinge is of a newer style. White gold was patented around 1910 I believe so its not white gold. I believe its silver and probably sterling (the antiques dealer could have tested this with the 18kt gold acid). I dont know why he would say it's not tarnished? It looks very tarnished to me. The edges arent tarnished because everyones been touching it but the base definitely is. The rope like detail around the edge is definitely tarnished silver and all the higher traffic areas on the rope are clean because they are more often rubbed than in the creases. Did he test the diamonds to make sure they were diamonds? They look like nice rose cut diamonds and if they are you could probably carefully polish the silver up a bit more to make them sparkle nicely. If they are foiled paste (which I dont think so) the polishing could ruin it. The black looks like onyx as well. Very nice detailed piece Id love for my collection! Good luck!