Rare vintage Czech crystal brooch in various colors, discount

Discount, new price 10 EUR, until Monday when I can send it
Interesting arrangement of bluish-green, purple crystals combined with gold-colored metal. The color changes depending on the lighting. Brooches of this type are rare.
Upon searching, I found that it could have been created in Czechoslovakia around 1930-40, not sure how reliable, but in any case, this brooch is older than Bohemian glass brooches created in Czechoslovakia.
Small, approximately 2 cm in diameter.