Antique yellow metal retailer bouquet shaped Brooch with blue faceted kite shaped glass stones / crystals Bohemian? Czech? Marked 187 Victorian style

A very pretty boutonnière shaped brooch, probably made in Bohemia retailer / Czechia - the only traces I could find connected to the mysterious "187"-mark seem to lead there.
Not sure which metal it is made of either, may be brass, but more likely some sort of gilt metal.
The "stones" are faceted in an unusual way showing the brooch is really old. I love their colour, too, and how they look against the golden metal.
There is also a stylish contrast between the realistic, a bit tropical looking leaves and the filigree cones the crystals are placed in.
6 cm long, 3 cm wide.
Nice antique condition, just one small chip on the bigger crystal, hardly noticeable because of the faceting.