MITUBACI BLOG

Notice of Summer Holidays (2021)

MITUBACI will be closed for the summer from August 10 to August 12, 2021. No workshops will be held during the holidays. Please note that we may not be able to reply to inquiries during the vacations. As for orders for the "Wedding Rings Made by Artisans" collection, please contact us through...

Ruby, birthstone of July

This time I would like to talk about rubies. Ruby is the birthstone of July, the same as carnelian and sunstone. The Japanese name for ruby is kogyoku (red jade). It has a Mohs hardness of 9, is not malleable, and has a toughness of 8, surpassing diamonds, which have a hardness of 7.5. In terms other than Mohs hardness, it is Da...