This has a Star in circle and small house in Hexagon 6 side stamp . It looks to have diamonds and a pearl on it .The Star mark can be seen on the second photo and house maybe seen on last photo .Very small marks and hard to take photos of. I tested this with iodine and it does not change color. I found the star mark on a page with Russian items.
Hi! I know it's been over a year or so that you posted about this brooch, but was there any definitive answer? I have the almost identical brooch to yours! It has a few more "stems" but it's the same construction, the exact same marks. This site is the only one I've found and I've been searching on and off for awhile I was so excited to find this! There are so many star in circle answers just wondering (also I think the other mark is for Austria for the crystals used) Thank you! Tess