Deselect the circle and then drag Layer 2 under Layer 1. If you need to move the circle selection a little you can do this by clicking on a portion of the circle and moving it until you have it aligned the way you need. Now highlight the top layer which should be Layer 1 and then add a new layer. This will be our top jewel. Again choose the Selection tool set to the same setting as before but make your circle much smaller.
Flood fill the same way as before.
Do the same with Layer 2. Next, with any of the three layers as the active one, turn off the background layer by clicking on the Layer Visibility Toggle next to it. Make the background layer active and apply whatever texture or color you want. I chose a texture I had and then colorized it. Now we are going to crop the image.