This pattern is now available on Ravelry – http://www.ravelry.com/patterns/library/three-pineapple-bookmark
I am very fond of the pineapple design. The white one is made in #10 cotton thread and the multi-colour one in #20 cotton thread.
In #10 cotton thread the bookmark without the tassel is about 5 inches (13cm)
I also made some as presents. Both #10 cotton thread.
Here is one with a book.