One of these forms is ruby. The main property of this substance in this state is its unusual hardness. Rubies are used for bearings in the movement, although sapphires since they also are very resistant to wear and tear, were also used as bearing jewels.
Your watch most likely has a crystal with an anti-reflective coating AR coating on the outside or both sides of it. A bare sapphire crystal tends to reflect light strongly. In certain lighting conditions and at some angles, this reduces the legibility of the dial. The problem is that manufacturers often settle for using an AR coating on the outside or both sides, for maximum effect.
This improves legibility. Sapphire can certainly chip at an impact. Well, either you can get that polished, or replace the crystal. The cost of a replacement could be high, depending on the brand.
Polishing, on the other hand, will remove the AR coating. This will affect the legibility, but no more ARC means no more scratches. When buying a watch, carefully look at the technical description. Manufacturers usually provide info about whether the AR coating was used on both sides, or just on the inside.
If you feel like you can sacrifice a tiny bit of legibility in favor of resistance to scratches, choose a watch with an AR coating on the inside of the crystal. Maybe not as cautious as with acrylic or hesalite, but still. These disks are then ground and polished into watch crystals. One reason sapphire crystals are relatively expensive is that the tools required to cut and polish this extremely hard material are very costly.
Sapphire whether natural or synthetic is one of the hardest substances on earth. It measures 9 on the Mohs scale, which is a system for rating the relative hardness of various materials. Diamond measures 10, the highest rating.
Diamond can scratch them; so can man-made materials that incorporate silicon carbide, which, with a Mohs rating of between 9 and 10, is harder than sapphire.
So, if you accidentally scratch your watch on a simulated-stone surface or a wall that incorporates some of these silicon carbide materials, it could scratch the crystal. Dave Singh — Senior Watch Technician.
Share Facebook Twitter Pinterest. Pre Post. Next Post. Inside Momentum - Judy N. Posted by Momentum Watches - April, Welcome to Our New Site! July, April, Which watches have the best luminous performance? February, Check out the other features of our watch. Close menu. Valianter KOVA.
Other products. Straps Gift cards. Our story. Code of Ethics. Close cart. Shipping, taxes, and discount codes calculated at checkout. Check out. Your cart is currently empty. Read more.
Back to Journal. Oct 05,
0コメント