Home Union Set of 2 cream handmade ceramic mugs

Set of 2 handmade stoneware stacking ceramic coffee mugs by Home Union. I bought them from the Brooklyn store, made by an Israeli designer. I paid $49 for each, they are currently sold out. I never used them because I drink my coffee in huge mugs. I only bought them for their beautiful look. But my kitchen is too small to keep them. There are grey dots or stain looking things on the ceramic. They had those on every single mug in the store. They told me thats the nature of the clay and the paint