History

1959

TOKYO PEARL CO., LTD was established. Takezo Koyama, Founder of Tokyo Pearl, started to export mainly Akoya cultured pearls to jewelers all over the world.

1980

Backed up by the worldwide network of jewelers, built up through the pearl business, Tokyo Pearl started to import diamonds and sell them to domestic jewelers.

1982

Started importing and selling Black South Sea pearls from Tahiti. At first, in Japan, black pearls were not so popular and also they were extremely expensive. Although people in the domestic jewelry industry stayed away from Black South Sea pearls, we continued to import, introduce, and sell them, strongly believing in their peacock feathers like beauty.

1983

Our head office building was completed in Higashi-Ginza, Chuo-ku, near the Kabuki-za Theatre and the Shinbashi Enbujo Theatre. To ensure accurate evaluation of pearl quality, the building was designed with large north-facing windows that allow in stable natural sunlight. The entrance hall was inspired by a small jewelry box, and as a company that handles precious items, the interior is designed to be discreet from the outside view.
The main showroom, which opened on the first floor of the new building upon its completion, has been well received by both domestic and international customers for its reasonable prices and wide selection of products unique to a wholesaler’s direct store.
The bronze doors that close at the end of each business day feature the Hōryū-ji tile pattern, said to originate from Prince Shōtoku. The motif represents the lotus flower, a common element in Buddhist art, symbolizing the ideals of “peace” and “harmony” cherished by Prince Shōtoku.

1984

YAMATO GIKEN, our own pearl factory, was established in Ise, Mie prefecture.

1987

Tie-up with Seikatsu Club.

1986-1996

Overseas affiliated companies (Antwerp, Bangkok, New York) were established.TP Colored Stone Co., Ltd. and TP Diamond Co., Ltd. were established.Sales offices in Kofu and Osaka were opened.

1994

T.P. DIAMONDS. CO. LTD., our own diamond cutting factory, was established in Bangkok, Thailand.

1997

Takezo Koyama, founder, was awarded with the decoration “CHEVALIER DE L’ORDRE DE TAHITI NUI” by the President of French Polynesia, H.E. Mr. Gaston Flosse. The award was bestowed upon Takezo Koyama in recognition of his contribution to the marketing and promotion of Tahiti Black pearls.

1999

Consolidation of overseas affiliated companies (Antwerp and New York), TP Colored Stone Co., Ltd. and TP Diamond Co., Ltd.

2007

Start of import of Golden South Sea pearls in earnest and selling them to domestic and foreign jewelers.

2009

GIA acknowledged our original diamond cut “DEWY DIAMOND” and named it “Buff Top Round Mixed Cut.” It is extremely unusual for GIA to establish a new terminology, especially for a one-of-a-kind cutting style. We are proud of this novelty cut, with soft and dewy brilliance.

2018

Our Chairman, Tota Koyama, was appointed as the President of the Japan Jewelry Association. (Stepped down upon completion of his term in June 2023)

2020

We entered into an exclusive partnership in Japan with Sarine Technologies, a company that pioneered diamond traceability technology worldwide. (As of 2025)

2021

Our Chairman, Tota Koyama, was appointed as the Representative Director of the Japan Pearl Export and Processing Cooperative Association.
(Stepped down upon completion of his term in May 2025)