This is another snowflake pattern by Jennifer Williams. Just like Lynn, you need a 15mm ring. You start by tatting over it and continue with Round 2. You can do a split chain and continue to Round 3 without cutting your threads.
The first snowflake I tatted was in Altin Basak Size 50 Siyam 1 (black with silver threads). I forgot to make the centre picot larger than the two side ones and when I remembered to do it in the second snowflake, I realised it made it look so much better.
The second snowflake was done in Altin Basak Size 50 in 2351 (gold with gold threads). The larger picot in the centre made the arms looked longer.