Oura Ring 4 Ceramic Smart Ring with 8-Day Battery vs Women's Harlow Two-Hand Stainless Steel Watch Ring: which is safer?
Fossil Women's Harlow Two-Hand Stainless Steel Watch Ring is our pick: better on PFAS and on the overall hazard picture.
Apple
Oura Ring 4 Ceramic Smart Ring with 8-Day Battery
PFAS grade
B 85/100
Overall grade
D 69/100
Verdict
Buy
Hazard flags
⚑ 4
Material
Ceramic coating with titanium, stainless steel band
Confidence
72%
PossibleCeramic coating composition (unconfirmed)
PossibleBacterial and fungal biofilm formation
PossibleNickel leaching from stainless steel components
Our pick
Fossil
Women's Harlow Two-Hand Stainless Steel Watch Ring
PFAS grade
A 95/100
Overall grade
A 91/100
Verdict
Buy
Hazard flags
⚑ 1
Material
stainless steel watch case and ring, mineral or glass crystal
Confidence
82%
PossibleNickel release (metal allergy)
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More water-resistant smart rings & bands: see the full ranking