About Us

Diamond Dealer, Jewelry Designer, and Graduate Gemologist.

Mark Hiroshi Willis

Half 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 diamonds from around the world. We specialize in one carat and up diamond engagement rings in Hearts and Arrows, and exquisite hand crafted jewelry.

A “Graduate Gemologist” from the internationally renowned Gemological Institute of America (GIA), with experience as a buyer at two De Beers Sightholders; he will guide you in your search for the perfect diamond.

Regularly holding events at Ginza Matsuya Department Store and private showings. Please see the “Events” page for our upcoming shows.

To learn more about Mark, visit his LinkedIn profile, read about him in various articles such as Japan Inc or visit our Facebook page.

Other works include, the English and technical translations of the Heart and Cupid Grading Standard for Japan’s largest independent grading laboratory (CGL).

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 find a mutual connection whom you can ask directly. (To view the recommendations, you must click on “View Full Profile”)

Linked IN