Core ring-Lume
Ships from EU
Crafted to Order — Ships in 1–2 Weeks
Secure Checkout
30-Day Returns
2-Year Structural Warranty
CORE — Lume Core Ring
Essential form. Integrated light.
The CORE Lume Core Ring is precision-machined from solid forged carbon fiber and defined by a clean, uninterrupted exterior.
Beneath the surface, a luminous interior core introduces controlled contrast. When charged by sunlight or UV, the inner structure emits a sustained glow that reveals itself only in low light.
The forged carbon shell remains minimal and refined, while the integrated strontium aluminate core is cast directly into the structure — not applied as coating or surface paint.
Each ring is carved from a single forged carbon shell and finished entirely in-house. The natural marble pattern formed during forging ensures every piece is one-of-one.
Minimal presence. Controlled illumination. Engineered clarity.
Details
- Material: Solid forged carbon exterior with integrated strontium aluminate luminous core
- Width: 6.5 mm
- Finish: Hand-polished gloss
- Interior: Comfort-fit ergonomic curve with luminous core
- Origin: Made entirely in-house
Features
- Machined from a single forged carbon shell
- Integrated luminous interior — not paint or coating
- Hours of glow per charge
- Charges with sunlight or UV light
- High strength-to-weight ratio
- Ultra-lightweight and durable
- Hypoallergenic
- Each forged marble pattern is one-of-one
Ring Size Guide
Ring Size Guide
| US Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 6 | 16.5 | 52.0 |
| 7 | 17.3 | 54.5 |
| 8 | 18.2 | 57.0 |
| 9 | 18.9 | 59.5 |
| 10 | 19.8 | 62.1 |
| 11 | 20.6 | 64.6 |
| 12 | 21.4 | 67.2 |
| 13 | 22.2 | 69.7 |
| 14 | 23.0 | 72.3 |
How to Measure at Home
Method 1 — Use an existing ring
- Measure the inner diameter of a ring that fits you
- Match the measurement to the chart above
Method 2 — String or paper method
- Wrap a string or strip of paper around your finger
- Mark where the ends meet
- Measure the length in millimeters
- Match to the circumference column
Tip: Measure at the end of the day when fingers are slightly larger for the most accurate fit.
Bracelet Sizing
SIZING GUIDE
Engineered fit starts with accurate measurement. Follow the steps below to select the correct size.
BRACELET SIZING
How to Measure Your Wrist
- Measure your wrist just above the wrist bone.
- Use a flexible measuring tape. If you don’t have one, use a string and measure it against a ruler.
- Keep it snug — not loose, not tight.
- Do not add extra space. We include a comfort allowance in the bracelet design.
Bracelet Size Chart
| Size | Wrist Circumference (cm) | Wrist Circumference (in) |
|---|---|---|
| XS | 14.5 – 16 cm | 5.7 – 6.3 in |
| S | 16 – 17 cm | 6.3 – 6.7 in |
| M | 17 – 18.5 cm | 6.7 – 7.3 in |
| L | 18.5 – 20 cm | 7.3 – 7.9 in |
| XL | 20 – 21.5 cm | 7.9 – 8.5 in |
Between sizes? Choose the larger size for a looser fit.
Care Guide
Kartiel forged carbon jewelry is finished with an automotive-grade clear coat used on luxury cars, providing durability and long-lasting protection. Clean with a soft cloth and avoid harsh chemicals to maintain its finish.
Choose options
How It’s Made
Each piece is shaped, finished, and refined in-house from forged carbon composite and precious materials.
