Absolutely beautiful museum with so much detail about the crystals and gemstones locally (and worldwide!) and the history of jewellery making. There are signs throughout in both English and Japanese, making it an easy way to experience the museum for a foreigner like myself. It is quite small and the staff weren't very interactive (although that may be because of the language barrier) so you could easily get through it in about 30 minutes or less but it is well worth spending a little longer looking at the details in the pieces and in the rock samples on display - and, it's free which is always a plus. Also, I came on a weekday but on the weekend there are artisans at work in a workshop near the end of the museum which would be very interesting I'm sure.