AboutAbout

Events

Upcoming Events. Exhibitions in Matsuya Department Store (Ginza), and private exhibitions throughout Japan and overseas. If you are interested in hearing about any of the events, please write to us so that we may put you on our mailing list: events@diamonds. co. jp

Vision

Helping you to understand diamonds in the quickest and easiest way possible.

About Us

Diamond Dealer, Jewelry Designer, and Graduate Gemologist. Mark Hiroshi WillisHalf American, half Japanese with a total of over 20 years in Japan, Mark is a second-generation jeweler with a lifetime of experience in the diamond and jewelry industry. Servicing various top international brands with only the best dia...

Testimonials

Testimonials That You Can Trust. When you see various testimonials on websites, do you trust them? Are you going to buy a product just because John S. said he got a great deal and great service? That is why we use Linked IN for our testimonials and recommendations. Take a look at my profile, and you may even fi...

Shop Information

Global Reach, Local PerspectiveOffering only the best diamonds, best value and best service. Currently our diamonds and jewelry pieces are only offered at exhibitions at Ginza Matsuya Department Store and private showings. Contact us to make an appointment at our Yoyogi Uehara Salon or to find out about an upcom...

Contact

If you have any questions in regards to diamonds, or would like to set up a private consultation for a diamond engagement ring or other diamond jewelry, please contact us at: info@diamonds. co. jp090-1886-4500 (Direct Line For Mark Hiroshi Willis). Our Facebook Page.

Page Top