Unusual Engagement Rings: Why Sapphire Won’t… Like the proposal that starts with a knock-knock joke, not all surprises are pleasant. But when it comes to unusual engagement rings, sapphire is an exciting alternative to conventional diamonds just because it makes it unexpected. Just when you think you know what it is and what it can do, sapphire shows you a whole new page and opens up a world of opportunities for unusual engagement rings.If you are like most, part of your spouse's attraction is their complexity and ability to throw you a curve when you least expect it. The same properties are what make sapphire a warm commodity today in the pursuit of unusual engagement rings.Blue and BeyondWhen Henry Ford designed the model T, he told customers that they could have any color they wanted, "as long as it's black". We often think of sapphires in the same way, provided our selection of choices goes from light blue all the way to ... dark blue. But wading a little further to options for unusual engagement rings and you will realize that blue sapphire is just the tip of the iceberg.It seems ironic that sapphire is made of a material called corundum, because it is clearly the smart choice to design unusual engagement rings. This very versatile substance can produce a variety of colors and tones from rich purple to delicate greens and blues.Gaga for YogoYogo sapphires, so called because they are only found on Yogo Gulch in Montana, boast a wonderful blue-flowered blue-green. Their uniform clarity and lack of cavities and elements mean that their brilliance, unlike Asian sapphires, is maintained even in artificial light. It is enough to set up border patrol as a minor inconvenience, and that is no small achievement.Tanzanian TreatsFor almost half a century, the Umba River Valley in Tanzania has delivered.