Smart Rings / Oura
Oura Ring 4 Ceramic (2025)
A $100 ceramic shell over Ring 4 electronics, and the scratches it will get are not warrantied.
Overall score 7/10
Pros
- + The only ring here that is not metal-coloured — four ceramic finishes including a genuine pastel
- + Ceramic is harder than titanium and does not pick up the same dull scuffing
- + Same sensors, same app and same 4-15 size range as the metal Ring 4
- + $100 below its $499 list at the time of writing
Cons
- − $100 more than the metal Ring 4 for identical sensing — you are paying for the shell
- − Oura's own page warns that minor scratches from everyday use are expected, and the warranty does not cover them
- − Ceramic chips rather than scuffs: a hard knock on tile is a different failure mode from a scratched titanium ring
- − Three-year cost lands at $608.97, the same as a brand-new Ring 5
- − Still tied to the $5.99/month membership like every other Oura
Oura Ring 4 Ceramic (2025) review: what the specs say
A $100 ceramic shell over Ring 4 electronics, and the scratches it will get are not warrantied. At $399, Oura's 2025 model sits at the premium end of the category — the smart Rings we compare run from $149.99 to $479. It scores 7.0/10 overall, calculated from published specifications across 8 categories rather than from a subjective impression.
Its strongest showing is Sleep Tracking at 9.3/10 — sleep staging depth, overnight accuracy and how usable the morning report is. The weakest is Subscription Freedom at 2.0/10, which is the trade-off to weigh before buying: if that is the specification you care about most, one of the alternatives below will serve you better.
Worth knowing before you buy: $100 more than the metal Ring 4 for identical sensing — you are paying for the shell; and oura's own page warns that minor scratches from everyday use are expected, and the warranty does not cover them. Every specification on this page comes from Oura's own documentation or a verified retail listing — where a figure is not published, the table says so rather than estimating it.
Specifications and price last verified . Report an error
Full Specifications
| Battery Life (claimed) | 8 days |
| Battery, In Practice | Same 5-8 day claim as the metal Ring 4, with the same caveat that ring size, app settings and activity level move it. 20-80 minutes to charge. |
| Subscription | Required in practice — $5.99/month or $69.99/year, identical to every other Oura. Paying $100 more for ceramic buys you no membership credit. |
| 3-Year Cost of Ownership | 608.97 $ |
| Sizes Offered | US 4-15, no half sizes, matching the metal Ring 4 |
| Sizing Kit | Free plastic sizing kit ships before the ring; 24-hour minimum wear including overnight, adding roughly a week before the ring ships. |
| Returns & Size Exchange | Oura does not publish a return window on its warranty page. The 1-year warranty excludes normal wear and tear; Oura's own product page states that minor scratches from everyday use are expected on the ceramic. |
| Measured vs Inferred | Identical to the metal Ring 4 — red/IR LEDs for blood oxygen, green/IR for heart rate and HRV, a temperature sensor and an accelerometer. Nothing about the ceramic shell adds a measurement. |
| FDA Clearance | None published. General wellness product. |
| Water Rating | Water resistant to 100m/328ft |
| Phone Support | iOS and Android, full feature parity; Oura lists integrations with 40+ apps |
| Charger & Data Export | Proprietary size-specific dock plus USB-C cable, and a ceramic polishing pad. Export: not published as a one-click history download; personal-access-token Cloud API only. |
| Connectivity | Bluetooth Low Energy (version not published by Oura) |
| Material | High-performance zirconia ceramic exterior over a seamless titanium interior |
| Warranty | 12 months |
Compare Oura Ring 4 Ceramic (2025) With
Cheaper Alternative
Circular Ring 2 (2025) — $299.00
Premium Alternative
Ultrahuman Ring PRO (2026) — $479.00