Sightholder directory


Head Office

Address 3-2, 6-chome,
Minatojima Naka-machi,
Kobe 650-0046
Phone +81-78-302-3321

Sales Offices

Address 3-2, 6-chome,
Minatojima Naka-machi,
Kobe 650-0046
Contact Mr Senda
Phone +81 78 302 3321

Short Facts

Year of establishment 1954
Number of employees 1317
Number of offices 12
Number of factories 2

Group companies

  • Tasaki Korea Co.,Ltd.
  • Tasaki Jewellery (Shanghai) Co., Ltd. 

Tasaki & Co Ltd


Over sixty years, Tasaki has developed into an internationally recognized diamond jewellery retail brand with a distinct Japanese heritage.   This is evident in the look and feel of all our stores, promising the consumer a rewarding and luxurious experience.  

Tasaki’s focus is to sell diamond jewellery directly to end consumers in Japan, China, Taiwan and Korea. We create innovative and fashionable diamond jewellery, catering to the diverse tastes of the countries in which we operate. 

Since 1994, Tasaki has procured Rough diamonds from the world’s largest Rough producer, De Beers, ensuring consistent supply of suitable diamonds.  All the diamonds used, meet strictly defined proportions and high quality standards.  Over 90% of the polished we manufacture in China and 100% in Japan receives a Triple Excellent Hearts & Arrows grade from international certification laboratories.  These diamonds, set in our constantly updated Collections, maintain Tasaki as the market leader in the diamond jewellery sector.  

Tasaki has in-house designers who organize client seminars; exhibitions and special events.  We have a Bridal Committee offering advice on choosing the most appropriate wedding ring.

Tasaki’s management and marketing sections are based in Ginza –home to Japan’s international luxury market. Technical and financial sections with long careered specialists are based in Kobe.  Tasaki & Co., Ltd. is a listed company in the First Section of the Tokyo Stock Exchange. 

Corporate Social Responsibility

During 2011, Japan experienced one of the biggest natural disasters in recent history. Immediately after the Tsunami, Tasaki created unique jewellery called “Magokoro Japan”, and all proceeds from sales are contributed to victims of the Tsunami.

Core Business Activity

Wholesaler, Polished manufacturer, Jewellery manufacturer, Retailer

Product Range Overview

Core Polished Diamonds

Sawables and Sawn 4gr to 10ct in predominantly collection colour in medium to better qualities.

Specialist Polished Diamonds

Round cut: Triple Excellent cut, Hearts and Arrows and AGS 0.

Diamond Jewellery

Tasaki sells diamond jewellery directly to end consumers. We develop and manufacture innovative and fashionable diamond jewellery designs, catering to diverse consumer tastes.  All the diamonds used in our jewellery have strict defined proportions and the highest quality standards.

We use Triple Excellent Hearts & Arrows in our Collections. These Collections are continuously refreshed and updated, remaining at the cutting edge of design excellence and positioning Tasaki as the market leader in the diamond jewellery arena.

Polished Outcome





Below 7pts

Fancy shapes Fancy colours Proprietary or branded makes
  x x x x      

Additional Services

In-house designers; jewellery manufacturing; additional technological capabilities; organising client seminars; exhibitions; special events.

Our Bridal Committee offers couples expert advice on selecting the most appropriate wedding ring.