Diamonds, sapphires, rubies and emeralds are considered the most suitable stones for engagement rings. Not all gemstones are suitable for everyday wear as they are too soft to withstand life’s daily activities. Diamonds are the hardest gemstones meaning they are resistant to chipping, scratching or breaking, followed closely by sapphires and rubies, and then emeralds. Alternative and still relatively durable gemstones include aquamarine, morganite, spinel, topaz and tourmaline.