Huge opalescent shops white and Aurorou borealis rhine stone and crystal brooch

Product Name: Huge opalescent shops white and Aurorou borealis rhine stone and crystal brooch
I've been holding on to this one. I didn't know if I wanted to sell it on here bc I don't know if it's vintage. I bought this and didn't have much information about it but it's huge and stunning the white parts are opaque color then there is aurora borealis rhinestone and the others maybe crystals. I'm unsure of material. I don't think I shops see a makers mark it's over 4 inches long it's hard to measure bc of size. This would be beautiful around Christmas or at parties wedding events ect.. the list goes on it's very pretty please use photos as reference. The photos are exactly the item you would receive zoom in b4 purchase back is c clasp . Very beautiful . Used good condition.