Check out the new gorgeous sapphires that were just added to the "Build your Own Ring" page. These are untreated round sapphires from Madagascar in gorgeous green, teal and blue shades.
I have one trillion cut 1.07ct teal green shade that is listed in Nodeform's signature sideways Tetra trillion bezel engagement ring design. It is also listed in the loose gemstone section and available for custom orders.
I also have a batch of slightly smaller 5mm to 5.2mm Madagascar sapphires in similar shades on hand. I am planning to create some in stock ring design with them for the holidays. But if you are looking for a smaller sapphire let me know and I can list them in the loose gemstone section.