Mikimoto Kokichi (1858 to 1954) was a Japanese entrepreneur and pearl culturer whose work in Mie Prefecture in the late nineteenth and early twentieth centuries established the cultured pearl industry as a global trade. The patents he developed and the operations he founded under the Mikimoto name became the basis of the Akoya cultured pearl industry, which produced and exported pearls in commercial volumes through the twentieth century and which gave Japan its principal position in the global pearl trade.

Early life and early experiments

Mikimoto was born on 25 January 1858 in Toba, on the Shima Peninsula in Mie Prefecture, the eldest son of an udon noodle restaurant family. He took over the family business in his early twenties but became interested in the local pearl-fishing trade, which at the time depended on natural pearls collected by ama divers from wild Pinctada fucata martensii oysters. The wild pearl trade was already showing signs of overharvest, and Mikimoto turned his attention to the question of whether pearls could be deliberately produced. He acquired oyster beds at Shinmei Bay, near Toba, and began experimental work in 1888 in collaboration with the marine biologist Kakichi Mitsukuri.

The breakthrough of 1893 and subsequent patents

On 11 July 1893, Mikimoto produced the first hemispherical cultured pearls, by the now-standard method of inserting a small irritant under the mantle of the oyster. The early production was of mabe pearls, hemispherical pearls grown against the inner shell of the oyster. He received Japanese patent number 2670 in 1896 for the method. Round cultured pearls, the more commercially valuable form, were produced by independent workers including Tokichi Nishikawa and Tatsuhei Mise in the early 1900s, with Mikimoto eventually licensing or acquiring the relevant patents and applying the technique at scale. The combined Mise-Nishikawa method, in which a shell-bead nucleus is inserted alongside a small mantle tissue graft, became the standard process and remains substantially in use today.

Building the firm and the trade

Mikimoto opened his first retail store in the Ginza district of Tokyo in 1899, and expanded internationally with stores in London, Paris, New York and Shanghai through the early twentieth century. He developed an aggressive marketing strategy that included demonstrations at international expositions, including the Philadelphia Sesquicentennial Exposition in 1926, where he displayed elaborate jewellery pieces incorporating cultured pearls. The cultured pearl was initially treated with suspicion by the European pearl trade, but a series of court cases in the 1920s and 1930s, most notably the Paris litigation of 1924, established cultured pearls as a legitimate gem material with separate legal and commercial status from natural pearls. Mikimoto's role in defending the cultured pearl in those cases is well documented.

Later life and legacy

Mikimoto continued to lead his firm into his nineties and was widely honoured in Japan as one of the country's principal industrial pioneers. He died on 21 September 1954 at the age of ninety-six. The Mikimoto firm, based at Mikimoto Pearl Island in Toba, continues as one of the principal Japanese pearl houses, although the broader Japanese cultured pearl industry has contracted since the 1990s as Chinese freshwater pearls and Australian, Indonesian and Philippine South Sea pearls have grown in importance. Mikimoto's contribution is generally regarded as having created the cultured pearl industry as a category, in the same way that De Beers shaped the modern diamond trade, although the credit for the round-pearl process specifically belongs more properly to Nishikawa and Mise.