The most blue ice caves of Iceland are found in Vatnajökull glacier. The crystal ice cave has incredible clear and blue ice and if you want the best ice cave experience this is the one you want to visit.

If you are visiting in winter, try to go at sunset. On a clear day the sun shines at the opening of the cave making the ice look like gold

The ice caves in Vatnajökull are only accessible in winter and by super jeep. I recommend going with Arctic Adventures, they always have great guides that creates a good adventure.