I've just had these fab little massage/palm stones made up, I think these are a better size for doing crystal healing, and crystal massage, as they're much flatter, they're perfect to use as ground stones (obsidian) eye stones (Rose quartz/white quartz) and as massagers for the hands and arms, you could even use these for crystal facials & lymphatic drainage. 

They measure at 4.5x3.5cm and are priced at £7.95 each