The land we live on has an enormous variety of soils. Not only classified as clay, loam or sand, etcetera or sized in categories from 10-30 mu onwards.
Have you ever looked at the diversity of colours? Yvonne de Wit has a stock of hundreds of different soils, all cleaned of organic material and graded in size. And what a diversity of earthy colours.
Yvonne uses these in her own design jewellery pieces like the Sterling Silver figurines.