Product Description

Overview

Experience Oura's premium 2025 ceramic smart ring with the Oura Ring 4 Ceramic in Petal (Size 9, 2025) — zirconia ceramic construction in a light blush pink with lilac hues, Smart Sensing 18-path multi-wavelength PPG, research-grade sleep staging, continuous heart rate and HRV, SpO2, body temperature, Readiness Score, 5–8 day battery, and 10 ATM water resistance. The Oura Ring 4 Ceramic Petal was launched in October 2025 as part of Oura's first ceramic collection. Petal's light blush pink with lilac hues is inspired by common ceramic glaze practices — a soft, floral everyday colorway that adds a distinctive pop of color while remaining subtle enough for everyday wear across all occasions. As with all four ceramic colorways, the color is embedded directly into the zirconia ceramic material during the traditional firing process — it is not a coating, and will not fade, chip, or peel over time. Inside, the Ring 4 Ceramic carries the full Smart Sensing technology and research-grade health monitoring of the standard Ring 4. Important: full access to Oura's health insights requires an active Oura Membership subscription ($5.99/month or $69.99/year, after a first free month). Please verify the subscription status of this account and set up your own Oura account before purchasing. This ring is Size 9 and is not adjustable — verify your size before purchasing. Note: zirconia ceramic can pick up grey marks from contact with softer metals such as cookware or gym equipment — these are surface metal transfers, not scratches, and can be removed with proper cleaning.

Key Features

• Zirconia Ceramic + Petal Finish — Permanent Blush Pink Color: The Ring 4 Ceramic's exterior is crafted from high-performance zirconia ceramic prized in fine jewelry for its durability, polished luster, and biocompatibility. Petal's light blush pink with lilac hues is embedded in the ceramic during the traditional firing process — not applied as a surface coating — meaning the color is permanent and will not fade, chip, or peel over time regardless of daily wear or water exposure.
• Smart Sensing — 18-Path Multi-Wavelength PPG — Research-Grade Accuracy: Oura Ring 4 Ceramic carries the full Smart Sensing platform — an 18-path multi-wavelength PPG subsystem that dynamically adapts to your unique finger structure and skin tone for continuously accurate heart rate, HRV, SpO2, and respiration data validated against gold-standard lab measurements in independent peer-reviewed research.
• Sleep Staging + Readiness Score — Comprehensive Daily Health Intelligence: The Oura App translates overnight sensor data into detailed sleep staging (REM, deep, light), a Readiness Score, Sleep Score, Activity Score, and daily insights — delivering a holistic picture of recovery, stress, and optimal performance windows for everyday health optimisation, including women's health metrics and metabolic health tracking.
• Petal — Light Blush Pink with Lilac Hues: Petal's soft blush pink finish with lilac undertones draws inspiration from traditional ceramic glaze practices — a subtle yet distinctive everyday colorway that brings a floral, feminine energy to the jewelry-grade wearable form factor, standing out from metallic smart ring finishes while remaining versatile enough for any everyday occasion.
• 5–8 Day Battery + 10 ATM Water Resistance: Up to 8 days of uninterrupted health tracking per charge, and 10 ATM (100 metres) water resistance for confident everyday wear in showers, pools, saunas, ice baths, and recreational diving — the same outstanding endurance and environmental resilience as the standard Ring 4.
• 24/7 Health Monitoring + Multi-Ring Support: Continuous heart rate and HRV, overnight SpO2, body temperature variations, activity tracking, stress and women's health monitoring — and Oura's multi-ring support feature allowing multiple Oura Ring 4 styles to be connected to a single account and switched between effortlessly in the app.

Specifications

Connectivity

• Bluetooth (to Oura App — iOS + Android)
• Magnetic USB-C Charging Clip
• 10 ATM Water Resistance (100 Metres)

What's Included

• (1) Oura Ring 4 Ceramic — Petal (Size 9)
• (1) Magnetic USB-C Charging Cable

Does Not Include Default Packages

• Original Box
• OR4 Sizing Kit
• Oura Membership Subscription (purchased separately — required for full insights)

Condition Specifics

Very Good Refurbished — Very Good Condition: Professionally inspected, fully tested, and restored to 100% functionality. Petal ceramic ring band shows light signs of cosmetic wear from normal use (such as faint surface scratches or minor scuffs on corners). All sensors — heart rate, HRV, SpO2, temperature, and accelerometer — are fully functional and data-accurate. Charging functionality has been confirmed fully operational and performance is completely unaffected.

Warehouse Quality Statement: All units are fully tested and verified according to our internal quality standards. Heart rate, HRV, SpO2, body temperature, and accelerometer sensors have been confirmed fully operational and within expected accuracy parameters. Bluetooth connectivity and charging have been confirmed functional. We do not open devices during our inspection or refurbishment process. Important: this ring is Size 9 and is not adjustable — verify your ring size before purchasing. Full access to Oura's health insights requires an active Oura Membership subscription ($5.99/month after first free month). Ceramic may pick up grey marks from softer metals — this is surface metal transfer, not damage, and is removable with proper cleaning or the included Polishing Pad.