A by-product (unusable) for a larger project, suddenly it looked good enough to be toiling with it for three days. Blender 2.79, Cycles, GIMP for textures. Eventually got featured among the Blender Art of the Week and had a tutorial written on request from Blender Nation: https://www.blendernation.com/2019/07/05/behind-the-scenes-lotsa-crystals/