Fall square mat

This is a square doily that I made for my mother in law, in 2003. At first, it was too small, so I added a three more rounds, in the same manner as the previous three rounds. Now it measures 39 cm square, just under 16 inches. I've done this one with DMC no 30. This is the first piece of tatting that I used the single shuttle split ring in; these rings are on each inside of both ribbon-like rounds of net stitch.

Below is a detail of this mat.