Custom Natural Diamond Jewelry & Fine Diamonds | Weiss Diamonds Tokyo

Weiss Diamonds is Tokyo's only English-friendly wholesale-direct diamond boutique, located in Okachimachi — Japan's largest jewelry district, just minutes from Ueno. For over 30 years we've supplied GIA, IGI, and CGL-certified natural diamonds to jewelry stores across Japan. Now we sell directly to you, cutting out the retail chain entirely and passing those savings on.

Whether you're searching for a custom engagement ring, a loose fancy color diamond, or finished fine jewelry, our private showroom gives you access to inventory that never reaches department stores or brand boutiques. No pressure, no markup, no intermediary.

We regularly welcome customers from Singapore, Hong Kong, Australia, and the US who visit Tokyo specifically to shop with us — whether for a custom engagement ring, a finished diamond necklace, or a one-of-a-kind fancy color stone.

Book a consultation, we'll have pieces ready that match exactly what you're looking for before you arrive.