The mirror that I've shown here is 1.5cm in diameter.If you don't have mirrors, fill a circle with gold or silver fabric paint and when it is dry, follow the instructions given below.You can even fill it with sequins, beads or french knots.These are the basic stitches for mirror work:
1.Make 4 straight stitches on the mirror as shown here.
2.Make 4 diagonal stitches as shown.
3.Bring the needle up at any point close to the mirror.Pull through.
4.Go over and come under the basic stitches and with the thread wrapped under the needle, pull through.
5.As you pull the thread, go down the fabric at the position shown and bring the needle up at a point close to it.
6.With the thread wrapped under the needle, pull through.
7.Repeat step 4.
8.Repeat steps 5 & 6.In this picture, I've shown the position where the needle should go in before coming out at a point close to it (click on the picture to enlarge it).Ignore the loop you see on top because here, I haven't completely pulled the thread after step 4.
9.This is how it should look like in the end.