2" SQUARE 10K GP NATASHA STAMBOULI RETRO SEMI PRECIOUS STONES PIN BROOCH

Lovely  condition gold tone brooch 80's-90's era, semi precious stones which include garnet, amethyst, jade, coral and others.  i AM going by another ad with the similar piece of what the stones are.. Go by pictures please..  The back is signed "NATASHA STAMBOULI" with a  gold lace overlay...  This brooch is 2 inches square with great stones.  Retro  Byzantine Era look  one ad said..  We tested this pin piece and it tested for 10 K gold. Online this pieces states it is 24K gold plated... art deco style 1990s metal over brass with a matte finish. Amethyst Austrian crystals description online SEMI PRECIOUS stones...... We are not professionals and use diamond and gold testers.. Thank you.  filed 11 2020    Lovely rose pink stone in centre.  and the stones  look like topaz, maybe jade, garnet, all pretty 2 2024