Anime enthusiasts eager to follow Ruri Tanigawa’s mineralogy adventures can now watch Ruri Rocks Episode 11, which premiered on September 14, 2025. Titled “Le berceau des saphirs” (The Cradle of Sapphires), the episode sees Ruri continuing her quest to uncover the secrets behind sapphire formations, deepening her understanding of geology and Earth science.
Release Date and Global Availability
Ruri Rocks Episode 11 was released in Japan on Sunday, September 14, 2025, at 9:30 PM JST. International viewers had access to the episode shortly after its local broadcast. The entire season, which is slated for 13 episodes, is consistently made available on Crunchyroll, often with English subtitles.
Where to Stream Ruri Rocks Episode 11
Fans worldwide can stream Ruri Rocks Episode 11 on Crunchyroll, the primary platform for the series. New episodes are typically released on Sundays at 6:30 a.m. PDT / 9:30 a.m. EDT, ensuring timely access for a broad international audience.
Episode 11 Plot Highlights: The Sapphire’s Cradle
Following the previous episode’s focus on Imari’s leadership struggles during a mineral hunt without Nagi, Episode 11 brings Ruri back to the forefront with a specific focus on sapphires. In “Le berceau des saphirs,” Ruri resumes her research, driven by a desire to understand the host rock of these precious gems.
The episode features Ruri identifying two distinct sapphire sites, a discovery noted as particularly rare. Her investigations involve applying techniques like testing with hydrochloric acid, which helps to reveal the presence of calcite. These scientific endeavors culminate in Ruri developing a plausible model for the sapphires’ history and formation. This critical experience not only bolsters her confidence but also solidifies her decision to pursue Earth science as a field of study.
Series Overview: A Journey into Mineralogy
Ruri Rocks, known in Japan as Ruri no Hōseki (lit. ‘Ruri’s Jewels’) or Introduction to Mineralogy, is an anime adaptation of Keiichirō Shibuya’s manga. The series centers on high school student Ruri Tanigawa, who, with a fondness for jewelry and shiny objects, embarks on a journey into the world of mineralogy. Her passion is ignited and guided by Nagi Arato, a graduate student specializing in the field.
The anime beautifully blends youthful adventure with scientific exploration, showcasing the duo’s mineral collecting excursions to mountains, rivers, and caves. It highlights the appreciation for nature, science, and the hidden wonders of the Earth, transforming abstract geological concepts into engaging narratives.
Production and Key Personnel
The Ruri Rocks anime is produced by Studio Bind, with Shingo Fujii directing the series. Michiko Yokote is responsible for the series composition, while Mayu Fujii handles character designs. The musical score is composed by Daisuke Achiwa and Kazuki Yanagawa, with Rei Yasuda performing the opening theme “Hikari no Sumika” and Hana Hope performing the ending theme “Sapphire”. The main cast includes Miyari Nemoto as Ruri Tanigawa and Asami Seto as Nagi Arato.
