What is a Krysterna™ crystal?

The glass-like covering over the face of your watch is called a “crystal.” There is usually another crystal in the case-back if you have a mechanical automatic movement in your watch. For many years there were two basic varieties of crystals used in the watch industry: mineral and sapphire. While they came in different grades, sapphire was always considered to be the best because of its hardness.

Sapphire crystals for watches are created in a laboratory environment and they have the same chemical properties as corundum which has a hardness of “9” on the Moh’s scale of hardness. (The only substance with hardness greater than sapphire is diamond which has a hardness of 10 on the Moh’s scale.) Because of their hardness, sapphire crystals contain the most “scratch resistancy” available in watches. However, sapphire crystals are prone to breakage due to the brittle nature brought about by its ungiving attributes.

Approximately four years ago, a new substance appeared in crystals in the watch industry, Krysterna™. Krysterna™ was born from the eyewear industry and comes from the same material used in high-end eyeglasses. Stührling Original was one of a handful of watch manufacturers that was involved in the early stages of testing and development of this new material in watch crystals. Krysterna™ actually has more strength over a spread surface area than sapphire! As a result, this still relatively new synthetic material is more “shatter-resistant” than sapphire!

  해석해 보면 미네랄보다는 스크래치에 강하고 (사파이어보단 약하고) 사파이어보다는 금가는거나 깨지는것에 강하다는거네요.

 참고로 미네랄의 모스 경도는 5.5 사파이어는 8~9 정도가 된다고 하네요. 모스 경도는 스크래치의 정도의 차이가 나고 깨짐에의 연관은 스크래치보다 적은 편입니다.

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