Samsung's next-generation flagship smartphone, the Galaxy S5, is expected to feature a unique scratch-restraint diamond metal casing.

The latest feature will certainly help the Korean electronics giant compete with Apple's upcoming iPhone 6, which is speculated to have a scratch-proof screen made of sapphire crystal.

The Korean electronics giant is currently testing the "diamond metal surface treatment." However, the company won't be coating real diamonds to make the device sturdy because that would be extremely costly in reality. Instead, the Galaxy S5 will have a "diamond-like" material coated on its metal case. Though this may cause a few changes in its external design, it will most definitely make the design resistant to scratches and deformation.

Samsung has created a synthetic diamond material by exposing carbon to high pressure and high temperature. The powder or liquid synthetic diamond is then coated on the metal surface of the Galaxy S5. However, some industry experts doubt the use of diamond coating in Galaxy S5 because the device is expected to hit the market in Q1 2014. The Korean company may not be able to use this technology on a mass scale so soon. Instead, Samsung may use the diamond casing for the upcoming Galaxy Note 4, which may be launched in late 2014.

Other expected features of the Galaxy S5 include a 16MP camera with ISOCELL technology, iris eye scanner, a QHD (2560 x 1440p) screen, Android 4.4 Kit Kat OS and 64-bit octa-core Exynos processor. There have also been reports that Samsung and AT&T are already testing the Galaxy S5 internally.