I love the look of the halo and art deco settings. They are absolutely stunning and really enhance the appearance of smaller center diamonds. I have seen many wonderful Halo threads, but I would love to see one that focuses on smaller center stones.
you can see several on NY Estate Jewelers- I love their stuff and many of their rings with gemstone halos are under 1ct. They have emerald, sapphire and ruby halos. http://www.newyorkestatejewelry.com/