I haven't seen anything like this before

I give the award for most impressive work done with titanium and niobium to Brian Eburah

http://www.jewellersonshow.com/cjos/09/brian5.htm

his work is done so well, its hard to deconstruct how he made the pieces above. The granulation around the stone and the lack of rivets is confusing since you cannot solder niobium or titanium. It is possible the colorful piece is held in by tension along the one side but I feel like there is more than that, I just cant figure it out.