The DX and DX+ follow the Gorilla Glass 6 and their main goal is to reduce reflection. Corning cut reflection down by 75%, which they claim improves screen contrast by about 50% at a given screen
Like voluptuary said Lumia have that 3 layer anti-glare and anti-smudge coating on top of gorilla glass. Lumia's screen scratch resistance is really very poor because of this. In general it is very resistant, but sightless press with sharp edge will leave a noticeable mark.
If gorilla glass dx+ is harder than mineral glass (which is 5-6) I’d probably be happy enoughbut I want the actual value. It’s not a hard thing to test, so would think the info would be available. Any help appreciated, cheers! So it's essentially between 5 and 6 on the scale.

cerium oxide is your best bet. You can Google for instructions on how to use it, but basically you just ad water and polish away the scratch. A dremel tool will make it go a lot faster, but it is doable without the dremel tool. I got a good sized scratch off one of my phones without too much difficulty. It was never as perfect as the rest of

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3.8. Gorilla Glass DX/DX+. Kế tiếp là một dòng sản phẩm Gorilla Glass khá là đặc biệt, đã được cải tiến từ dòng SR+. Được phát triển để sử dụng trên các thiết bị đeo có màn hình nhỏ. Lần này DX và DX+ đã hướng đến các dòng thiết bị đeo đặc biệt như là smartwatch.
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gorilla glass 3 vs dx