Here is a little collection of patterns for crochet jewelry featuring the famed Irish rose.
This 15 pages tutorial includes detailed instruction for creating 4 different crochet necklaces, and and 4 earrings.
A little basic jewelry making skill is also useful for finishing you jewelry.
The models in the tutorial and photos were worked with DMC Cebelia size 30, and crochet hook size 0,75.
If you find it difficult to work with such fine threads and tiny crochet you can always use a larger hook and thread. But be aware that the size will be a little different, though the necklace and earrings set will still be just as lovely.
If you prefer you can use a crochet hook size 1.00 with DMC perle cotton size 8, or the thread, hook of your choice.