Get to Know CoCr

September 4th, 2025

A Gentle Choice for Sensitive Skin.

Having sensitive skin doesn’t mean you have to give up wearing earrings! All it takes is choosing the right material for your skin, and you won’t have to worry about irritation anymore.

Many people experience itching, redness, or inflammation when wearing fashion jewelry. That’s usually caused by nickel, a common ingredient in most fashion accessories, which often leads to skin irritation. The solution? Choose jewelry with nickel content that meets safety standards, or even better, jewelry that’s completely nickel-free!

You may already be familiar with medical-grade stainless steel 316L, a material we at NooYoo use for most of our earrings because it’s safe for sensitive skin. But CoCr may still sound new to some. So let’s get to know it better!

🔍 What is CoCr?

CoCr, or Cobalt-Chromium, is an alloy mainly composed of cobalt (Co) and chromium (Cr). Sometimes, other elements are added to enhance its physical properties. If you’ve ever heard about materials used in orthopedic implants like artificial joints, bone screws, or even in dentistry such as crowns, implants, or retainers, that’s CoCr!

Thanks to its unique properties such as durability, shine, corrosion resistance, and lightweight feel, CoCr has also become popular in jewelry making.

✅ Who are CoCr earrings suitable for?

NooYoo’s CoCr earrings are nickel-free, making them an excellent choice for people with sensitive skin. You can wear them with confidence, without worrying about irritation.

💡 Highlights of CoCr jewelry

Lightweight.
Luxurious shine with a smooth, refined surface.
Scratch resistant.
Nickel-free safe for sensitive skin.

‼️ Considerations

More expensive than earrings made from other materials.
Limited design variety, since CoCr jewelry is often created with a clean and simple look for durability.