The word “sapphire” typically conjures up images of luxury gems, but it could soon be associated with high-end smartphone displays as well. Technology Review reports that engineers at New Hampshire-based GT Advanced Technologies are working on ways to make sapphire a practical alternative to Corning’s ever-popular Gorilla Glass as a building material for smartphone screens. While Technology Review concedes that sapphire screens will likely remain much more expensive than Gorilla Glass screens going forward, the publication points out that sapphire screens would be roughly three times more durable and resistant to scratching than Corning’s displays. The key will be to get sapphire display costs down to around $20 per unit, which would still represent a major premium compared to a typical $3 Gorilla Glass screen, but would at least make the material viable for a limited number of high-end smartphones.