Toyo Loose Successfully Holds Impromptu 'Oshi-Color Small Bottle' Workshop with Fully Booked Sessions

Toyo Co., Ltd. (Headquarters: Okegawa City, Saitama; CEO: Hideo Nakamura), which operates under the corporate philosophy of 'Creating Smiles,' manages Toyo Loose, one of Japan's largest loose stone shops. The company held a 'Workshop to Make Oshi-Color Small Bottles' at its own sales event for four days from Friday, May 2 to Monday, May 5, 2026.

This workshop was organized as an experiential project where customers could freely create their own 'Oshi-color small bottles,' a concept that has already gained popularity as a pre-made product. Despite being an 'emergency event' held with almost no prior major announcements, it attracted many customers and became a highly successful event that was nearly fully booked every day.

■ Workshop Overview

Dates: Friday, May 2 to Monday, May 5, 2026
Time: 10:00 - 18:00
Price: 1,000 yen per bottle (tax included)

Participants freely selected their favorite colors and shapes from various provided loose stones (gemstones) to create a one-of-a-kind 'Oshi-color small bottle.'

Customers could mix any number of colors as long as they fit within the bottle. The ability to express an 'ideal Oshi-color' by combining multiple colors, rather than just a single color, was highly enjoyed by many attendees.

During this workshop, a total of 68 'Oshi-color small bottles' were produced. This means that approximately 1 in 2 customers who visited and made a purchase during the event participated in the workshop, reaffirming the high level of interest in the project and the strong demand for 'Oshi-katsu' (fandom activities).

■ Background of the Event

Previously, Toyo Loose has offered 'Oshi-color small bottles' as ready-made products, selling a total of 10 colors: red, blue, yellow, orange, green, light blue, purple, pink, white, and black. This is a popular item that encapsulates real gemstones in small bottles, targeting those who enjoy 'Oshi-katsu.'

However, the company received numerous comments from customers stating:

- 'I want an Oshi-color small bottle that mixes multiple colors, not just one.'
- 'I want to express the Oshi-color with my own personal combination.'

Since it was difficult to individually prepare all possible color combinations as retail products, the company planned this workshop where customers could realize their ideals by 'making it themselves.'

By having customers choose the loose stones themselves, it became possible to complete 'Oshi-color small bottles' with greater freedom and deeper personal sentiment.

■ 'Oshi-katsu Experience' Enjoyed by Parents, Children, and Friends

At the venue, many participants were seen crafting together as parents and children, or enjoying the experience with friends.

Because the event dates coincided with the Golden Week (GW) holidays, many participated as part of family outings or leisure activities with friends, allowing customers across a wide range of generations to enjoy the event.

Some customers even pursued their ideal Oshi-colors by actually placing acrylic stands or other merchandise of their 'Oshi' nearby and selecting loose stones while checking the exact color tones.

As a new way to enjoy the fusion of gemstone brilliance and 'Oshi-katsu,' it was highly praised by many.

■ Next Event Scheduled Around Summer Vacation

Following the tremendous response this time, the next event is scheduled for around the summer vacation period.

To allow even more customers to participate, Toyo Loose will continue to develop experiential projects and new products under the theme, 'Making gems more familiar, and Oshi-katsu more fun.'

■ What is an Oshi-Color Small Bottle?

The 'Oshi-color small bottle' is a limited loose stone product developed for those who enjoy 'Oshi-katsu.'

Themed around the image colors of favorite idols or characters, real gemstones are sealed in a small bottle. It has gained popularity as an item that allows fans to 'leave their feelings for their Oshi in a physical form.'

During the initial launch, website access surged immediately after sales began; popular colors sold out in tens of minutes, and all colors sold out on the same day, marking a massive response.

■ What is Toyo Loose?

Toyo Loose made its exhibition debut at the 7th Saitama Mineral Marche held at Omiya Sonic City (Saitama Prefecture) from March 29 to 31, 2019. Since its debut, the brand has continued to exhibit at gemstone exhibitions held nationwide twice a month. Currently, it has covered 28 prefectures (Hokkaido, Yamagata, Akita, Miyagi, Niigata, Tochigi, Gunma, Saitama, Tokyo, Kanagawa, Chiba, Yamanashi, Nagano, Shizuoka, Ishikawa, Aichi, Kyoto, Osaka, Hyogo, Okayama, Hiroshima, Yamaguchi, Kochi, Ehime, Fukuoka, Kumamoto, Kagoshima, and Okinawa *according to company research).

The online store was opened on November 29, 2024. Currently, there are about 800 items listed for sale. With some gemstones priced at just 200 to 300 yen each, the company sells loose stones at affordable price points that are easy for customers to purchase, just like at their exhibitions.

■ Introduction of Toyo Loose's Gemstone Appraiser

Eriko Nakamura (Purchasing and Appraisal, Toyo Loose)

In 2024, she acquired the 'FGA,' a gemological qualification certified by Gem-A (Gemmological Association of Great Britain), known as the world's most difficult and oldest gemological institution.