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Victoria Stone - Series Part 1

1955 Synthetic Stone Patent

1957 Tokyo Metropolitan Invention Exhibition Flyer Dr. Iimori’s success in creating synthetic gemstones soon leads him to file a patent to protect his invention. Patent application number “Sho 30-000088” is titled "The Synthetic Manufacturing Process for Decorative Stone" is filed with the Japanese Patent Office (JPO) in 1952 and published in 1955. It covers the manufacturing process for Meta-jade, Cat’s Eye, and Victoria Stone, although the names of the stones were not present at the time. The names Meta-jade, Cat’s Eye, and Victoria Stone wouldn’t become a registered trademark (Japanese trademark registration No. 50957) for his invention until later in 1956.

The patent describes (1) a basic component, (2) a mineralizing component, and (3) a crystallizing component as the key items in the synthesis process. Minerals and the ratios in which they were used are provided along with their heating temperatures and the product cooling cycle durations. The patent includes information pertaining to the crystal habit regulator that was a key component of the Victoria Stone synthesis. A description of the coloring process is included as guidance for modifying the base Meta-jade formula to make the Victoria Stone variation of IL-Stone. The patent also mentions the radioactive material Thorium Oxide as one of the materials that is used to induce the aggregate structure of radial crystals in the Victoria Stone manufacturing process. A number of laws currently regulate the possession of radioactive material in Japan making it extremely difficult to obtain by businesses, and impossible for the private citizen to possess. In the US the sale is controlled and limited to licensed entities, however the purchase of small amounts by private individuals is permitted on a yearly basis. The English translation of the patent has been provided by the Iimori family, it will be published in its entirety here on our website in part 2 of our Victoria Stone series..

The trade show flyer to the right (provided to us by the Iimori family) provides proof that the Meta-jade, Cat’s Eye, and Victoria Stone gemstones were introduced to the public as early as 1957 when they won the “Excellent Invention Award” from the Tokyo Metropolitan Invention Exhibition. Advertised as quality imitation gems that were economical in price, the stones quickly gained popularity.

Contribution of the Patent for Publication

We would like to take this opportunity to once again extend our gratitude to the Iimori family for their generosity. We consider the Iimori family to be extraordinary for both their willingness to provide the patent and give us permission to post it on our website, and for undertaking the effort to have the patent, which only remains as a photographic image of the original in the JPO database, translated into English so we can understand its content. We hope our readers would join us in thanking the Iimori family for their contributions and commitment to vetting the information that appears in this series of articles.

Future Installments in our Series

Next month, in part 2 of our series, we will pick up where we left off and provide more information on Victoria Stone and the other stones produced by Iimori Laboratory, Ltd. The next installment will contain insight into Dr. Iimori’s work with his Crystal Habit Modifier, known later only as the “Habit Modifier”, it was a crucial component used in the production of Victoria Stone. We will also publish the English translation of the Japanese patent publication for Victoria Stone.

Later in parts 3 and 4 of this series we will provide an in-depth look at the life and work of Dr. Iimori. As a Doctor of Science he was educated in part by the Nobel Prize winning scientist Frederick Soddy in Great Britain. As a scientist, researcher, inventor, teacher, lecturer, and author; he was truly a talented man that accomplished much more than the invention of beautiful imitation gemstones that we know him for today.


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Page last updated: October 11, 2014

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