September5 Completes 'Number Series' with New Number Rings and Earrings Launching June 12
September5 announces the final installment of its personalized jewelry collection, merging ethical lab-grown diamonds with traditional Japanese craftsmanship.
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- 📰 Published: May 28, 2026 at 21:59
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September5 has announced the completion of its signature 'Number Series' with the launch of new numbering rings and earrings on June 12, 2026. This collection is designed to transform meaningful numbers into daily-wear jewelry that empowers the wearer.
Key features of the collection include:
- Craftsmanship: Each piece is handcrafted by skilled artisans in partner workshops located in Kofu, Yamanashi Prefecture, ensuring stable, high-end quality.
- Material Excellence: The series utilizes K18, K10, and Platinum. All lab-grown diamonds meet strict standards: Color F or higher, Clarity VS1 or higher, and Cut 'Very Good' or higher.
- Technical Innovation: The earrings feature a proprietary screw-post design, ensuring they remain secure during daily use.
The collection aims to offer 'light luxury' that transcends trends, blending naturally into both daily and formal settings. To celebrate the launch, a three-day pop-up event will be held at tefu Yoyogi-Uehara from June 12 to June 14, featuring exclusive displays and the full lineup.
Representative Director Maki Ota stated, 'We want to provide jewelry that allows adult women to feel pride and brilliance in their lives. From the texture of the gold to the weight on the skin, every detail is designed for a moment of self-care.'
Product Pricing Examples:
- Number Ring (K10): from ¥110,000 (tax incl.)
- Number Ring (K18): from ¥253,000 (tax incl.)
- Number Earrings (K18/Pt): from ¥99,000 (tax incl.)
Key features of the collection include:
- Craftsmanship: Each piece is handcrafted by skilled artisans in partner workshops located in Kofu, Yamanashi Prefecture, ensuring stable, high-end quality.
- Material Excellence: The series utilizes K18, K10, and Platinum. All lab-grown diamonds meet strict standards: Color F or higher, Clarity VS1 or higher, and Cut 'Very Good' or higher.
- Technical Innovation: The earrings feature a proprietary screw-post design, ensuring they remain secure during daily use.
The collection aims to offer 'light luxury' that transcends trends, blending naturally into both daily and formal settings. To celebrate the launch, a three-day pop-up event will be held at tefu Yoyogi-Uehara from June 12 to June 14, featuring exclusive displays and the full lineup.
Representative Director Maki Ota stated, 'We want to provide jewelry that allows adult women to feel pride and brilliance in their lives. From the texture of the gold to the weight on the skin, every detail is designed for a moment of self-care.'
Product Pricing Examples:
- Number Ring (K10): from ¥110,000 (tax incl.)
- Number Ring (K18): from ¥253,000 (tax incl.)
- Number Earrings (K18/Pt): from ¥99,000 (tax incl.)
FAQ
What are the quality standards for the diamonds used?
September5 uses lab-grown diamonds with a color grade of F or higher, clarity of VS1, and a cut grade of Very Good or higher.
Where are these jewelry pieces manufactured?
All items are individually handcrafted by artisans in a partner workshop in Kofu City, Yamanashi Prefecture, a hub for Japanese jewelry production.
How secure are the earrings for daily wear?
The earrings utilize an innovative screw-post (threaded) system developed by September5 to prevent them from falling off accidentally.