You will need:
-Felt or other fabric (I chose indigo blue)
-Scissors
-Ring band
-Needle
-Matching colour thread

Cut out as much pedals as you wish.
I used 11 pedals. You can cut more to make your rose to have more volume.
My pedal size is within 1 inch x 1 inch.

Take a pedal and put a string at the tip of the pedal (the side that is narrower) as show in the picture

Pull the string tight so that you create a shape like this. Tie a knot to keep the shape. Repeat these steps for the rest of the pedals

You should have something like this.

Take four of them and sew them together.

Tips: One pedal should overlap the other (like a fan)

You should have something like this after sewing the 4.

Repeat another set of 4 and a set of 2. Keeping one pedal remaining.

Now, stack the 3 sets together and sew. You should have 2 sets of four's and 1 set of two's. Make sure the set of two's is at the top.

Tips: Distribute the pedals evenly

Now mold the two pedals in the center and squeeze a bit inwards and secure with thread.

Use the remaining pedal and roll the tip to something like this and secure with thread. This will be used as the center pedal.

Fit the pedal into the center and sew in place.

Tips: you might need to trim the center pedal a bit if it appears to be taller than the rest of the pedals.

Cut out the same size circle as the ring blank from the felt.

Sew the circle to the bottom of the rose.

You should have something like this. Now glue the circle onto the ring band circle area.

Ta la~ You're done!