This Case Study, whilst expanded on in the workshop with nine participants in Germany to include other materials, mainly revolved around the use of waste diamond materials to create jewellery pieces. Diamonds, interesting for their societal status and assigned value, are useful for a range of manufacturing companies, who use this hardest material on the planet to produce a variety of tools serving a range of sectors, including the automotive and medical industries. In these contexts any material that does not, or no longer, meets the quality standards is classed as waste. This waste offers a unique opportunity for urban mining. Where diamonds are grown in the lab to be faceted and incorporated into jewellery, here too interesting waste materials can be mined, which might be an additional venture for suppliers claiming to produce sustainable materials that aligns with their sustainability drive. However, with many diamonds already in circulation, it is questionable why the growth of more diamonds to imitate those already mined is a necessity. Urban mining diamonds from both the tooling industry and, for example, old jewellery pieces would provide a significantly more sustainable alternative. Whilst urban mining as a methodology is not new, and arguably has been practiced with precious materials (particularly in gold recycling) for many years, its application to crystal materials is still limited, yet could provide both sustainability and creativity benefits. As a Neo-alchemist, engagement with, in particular these crystal materials, in the context of the research felt like a response-ability to the global context which requires all of us to take responsibility.