THE. PIECE.
黒炎 | Koku’en - Black Flame
Discipline. Power. Fire.
Built from fire held in iron. Onyx controls. Hematite grounds. Lava Stone burns within. Together they forge unstoppable will — calm, focused, and fiercely driven.
Finished with the black seal — silent, grounded, and unyielding. Made for the man who moves with force, but never loses control.
YOUR BEADS. YOUR JOURNEY.
YOUR. FIT.
Your Fit
Each Rengetsu piece is sized by its inner circumference - designed to match the wrist it's made to fit.
How to Measure
Wrap a soft tape measure - or a string you can mark - around the smallest part of your wrist.
Measure tightly. The measured number is your Close Fit; add 0,5 cm (or 0.2") if you prefer a Comfort Fit.
Between two sizes? Go up.
True strength leaves room to move.
|
Wrist Circumference |
Close Fit |
Comfort Fit |
|
16 cm (6.3") |
16 cm (6.3") |
16,5 cm (6.5") |
|
16,5 cm (6.5") |
16,5 cm (6.5") |
17 cm (6.7") |
|
17 cm (6.7") |
17 cm (6.7") |
17,5 cm (6.9") |
|
17,5 cm (6.9") |
17,5 cm (6.9") |
18 cm (7.1") |
|
18 cm (7.1") |
18 cm (7.1") |
18,5 cm (7.3") |
|
18,5 cm (7.3") |
18,5 cm (7.3") |
19 cm (7.5") |
|
19 cm (7.5") |
19 cm (7.5") |
19,5 cm (7.7") |
|
19,5 cm (7.7") |
19,5 cm (7.7") |
20 cm (7.9") |
|
20 cm (7.9") |
20 cm (7.9") |
20,5 cm (8.1") |
|
20,5 cm (8.1") |
20,5 cm (8.1") |
21 cm (8.3") |
|
21 cm (8.3") |
21 cm (8.3") |
21,5 cm (8.5") |
*This size guide is provided for reference only. Rengetsu cannot be held liable for any deviations in fit.
SHIPPING
Delivery
Shipping
All orders placed on weekdays ship within 24 hours.
Orders placed over the weekend ship on Monday.
- Netherlands: Delivery within 1–2 business days
- Europe: Estimated delivery within 3–7 business days
- Rest of World: Estimated delivery within 7–21 business days
You’ll receive a tracking link as soon as your order is shipped.
Free shipping
- On orders from €50 within the Netherlands
- On orders from €100 within Europe
- On orders from €200 for the rest of the world
Note:
For all deliveries outside the EU, import duties and taxes may apply. These are not included in your order total and must be paid upon delivery. Rengetsu is not responsible for these fees — rates vary per country.
We advise you to check with your local customs authority for accurate information.
GIFT. READY.
Power in Presentation
Each Rengetsu piece arrives in a deep blue box, embossed in gold and crafted to reflect the care within.
Inside: your selected bracelet, a signature Rengetsu pouch, and a pearl-white Rengetsu piece card.
No receipts or prices are included.
Ready to be gifted. Or claimed.