Set of vases in many layers of glass, we think they are Czech from the 80s

A set of beautiful vases in many layers of glass, we think they are czech and from the 1980s. They consist of transparent, black and milky white glass ‘bent/inlaid’ into each other, very decorative. They are 16.5 high, 13 cm in diameter and weigh 785 grams and 880 grams (they are handmade and mouth-blown, so shape, weight etc. Vary a tiny bit) Without chips, cracks or other defects with only minimal wear and tear. Price is for the set = both vases. Packed securely and shipped with insurance.