Unsigned Hand-Carved Abstract Modernist Stone Sculptures (Possibly European, Mid-Late 20th Century)

I am looking for help identifying this pair of unsigned hand-carved abstract stone sculptures. They were acquired together and appear to be by the same artist or workshop. Each is carved from a light-colored natural stone and weighs approximately 4.6 kg and 5.4 kg. I have not found any signatures or labels. Any information on the artist, age, material, or origin would be greatly appreciated.