On all of the iPhone 7 pages that mention the new Jet Black device, Apple has a small footnote that says that while the surface of the device is as hard as other Apple products, the shine may show micro-abrasions. Apple recommends customers who are concerned about the abrasions protect their Jet Black iPhones with an iPhone case.
The high-gloss finish of the jet black iPhone 7 is achieved through a precision nine-step anodization and polishing process. Its surface is equally as hard as other anodized Apple products; however, its high shine may show fine micro-abrasions with use. If you are concerned about this, we suggest you use one of the many cases available to protect your iPhone.The disclaimer about scratching on the Jet Black iPhone suggests Apple will not be replacing Jet Black iPhones that become marred with abrasions, as it is a known side effect of the glossy finish.
Alongside Jet Black, Apple is offering the iPhone 7 and 7 Plus in a matte "Black" shade that replaces Space Gray, so customers looking for a darker shade who don't want to worry about scratches should consider that device.