Twilight engagement ring design

You all remember the design of engagement ring that Edward will give to Bella in the Eclipse. The InStyle magazine represented overview of it and according to article, the design of ring was made by The Twilight Saga creator Stephenie Mayer. In The book author explains all of the details how the ring looks like. The ring is made of gold and decorated with natural diamonds as they had no time to make it as artificial.
Stephenie Mayer decided to make the design of ring by her own when all of the designs which were made by others didn't quite match to the one that she kept in mind when wrote the book.