Rare vintage Czech crystal brooch in various colors, discount

Discount, new price 10 EUR,
Interesting arrangement of bluish-green and purple crystals combined with gold-colored metal. The color changes depending on the lighting. Brooches of this type are rare.
After googling, I found that it could have been created in the Czech Republic around 1930-40, I don't know how reliable it is, but in any case, this brooch is older than Bohemian glass brooches created already in Czechoslovakia.
Small, with a diameter of approximately 2 cm.