Apple's iPhone 6 'indestructable' sapphire display tested on video - and new curved screen emerges unscathed

Apple's iPhone 6 will have a virtually indestructible screen made of sapphire, it has been claimed, the Daily Mail reports.

A YouTube videomaker claims to have acquired one of the screens - and has subjected it to a barrage of abuse, from stabbing it with a knife and keys to bending and twisting it.

In the video, the screen emerges totally unscathed - raising hopes is could lead to a far more resilient handset from Apple.

Marques Brownlee, a popular YouTube host claims to have got the screen from well known Apple leaker Sonny Dickson, who recently made his own video showcasing the screen.

In the video he can be seen bending and twisting the screen.

'I slowly realized there is absolutely no way I can break this display under my own power,' he said.

'The worst blemish on the surface was actually my fingerprint marks and the dust from handling it so much.'

The glass is also extremely high-quality, Brownlee noted: 'There’s absolutely no color shift while looking through the sapphire glass.'

It is claimed the screen is made from sapphire crystal.

Apple already uses a small amount of sapphire glass for the 'Home' button and camera lens in the iPhone 5S, but the rest of the current iPhone front display is made of Gorilla Glass.

The new glass display is 'paper thin,' Brownlee said in his video.

Brownlee shows his screen measures 4.7 inches diagonally, keeping with rumors that Apple will release two different-sized iPhones this year: A 4.7-inch model and 5.5-inch one.

Reports Apple was experimenting with sapphire displays began last year, yet sources claimed at the time Apple found the technology ‘infeasible.’

This was because sapphire glass is more expensive to produce than normal screens.

However, Apple recently announced plans to open a mineral plant in Arizona with sapphire glass experts GT Advanced Technologies.

The facility is expected to employ around 700 people to manufacture sapphire crystal and sapphire glass, and this technology could make its way onto the screens of the next iPhone.

In a statement about the announcement, GT Advanced Technologies said: ‘Although the agreement does not guarantee volumes, it does require GT to maintain a minimum level of capacity.’

While an Apple spokesman added: 'We are proud to expand our domestic manufacturing initiative with a new facility in Arizona, creating more than 2,000 jobs in engineering, manufacturing and construction.

‘This new plant will make components for Apple products and it will run on 100 per cent renewable energy from day one, as a result of the work we are doing with SRP to create green energy sources to power the facility.’

Earlier this week iPhone maker Foxconn revealed Apple's new iPhone 6 could be the first to be made using its 'robot army'.

The firm has pledged to have a million robot workers by the end of the year - and CEO Terry Gou has revealed the robots, dubbed 'Foxbots', are in the final stages of testing.

It is believed Foxconn will install 10,000 robots as a test.

Lines dedicated to Apple devices getting first priority, according to IT Home.

It says Gou told a shareholder meeting that Apple would be the first company to take advantage of the new robot workers meaning that its next product - the iPhone 6 - will be manufactured in this way.

Each $25,000 Foxbot can complete an average of 30,000 devices per year it has been claimed.

Foxconn, which currently employs more than 1.2 million workers at its various factories across China.

However, the firm's robot initiative has been delayed since it was first announced in 2011.

At the time, Gou said the company had about 10,000 units already in operation, a number that was supposed to rise to 300,000 in 2012, then one million by 2014.

However, the firm is also ramping up human workers for the iPhone 6, with 100,00 being hired according to some reports.

Dozens of pictures have leaked online claiming to show Apple's iPhone 6.

They all show a thin, curved device with distinctive white 'bars' across the back.

However, a Japanese news agency has claimed that in fact, the finished product will look very different - and that it could even have a curved screen.