This pattern uses UK crochet terms. . A US version is also available here
This necklace is crocheted all in one piece, adding the flowers as you go. The flowers are about 4.5cm across. It would work with most yarns. If you wanted a different size necklace you could easily substitute the 4ply for a thicker or thinner yarn. The necklace is designed to slide over your head.
The Dorset buttons in the centre of each flower are made using a contrasting lace weight and are added afterwards. The button instructions are included in the pattern. You will need a blunt ended needle like a tapestry needle, 9 x 1.5cm brass rings and about 18m of lace weight yarn to make them.