Morganite even holds sway when it comes to hardness and durability. The gemstone scores 8 on the Mohs scale of hardness, meaning morganite’s hardness is only inferior to that of diamond, ruby, and sapphire. Not to forget the fact that both ruby and sapphire rank the same on the Mohs scale, that is, 9 out of 10. This is the reason, morganite rings are the best choice for engagement.