It Was Lemon Jelly!
Mystery solved – it wasn’t an aquarium, weird helmet, glass filled with rocks or crystals… no, it was in actually fact lemon jelly in a wine glass. Ta-daa! Lighting was done with a small (and crappy) desk lamp and a blue strip light. Closer up shots of the jelly were done with a nikon 50mm 1.8 and some extension tubes.