Start with a Magic Circle so that you have 4 double crochet, then turn your work. Then make 4 double crochet between the first and the second double crochet and turn, and so on, to desired length. Add a bead.
Floral crochet necklace is made by creating several floral motifs and joining them together with a crochet chain with beads. Free pattern download: http://www.coatscrafts.co.uk/NR/rdonlyres/CCF21602-FDAE-4F72-9E56-2AC06880BA10/75098/BeadedFlowerNecklace.pdf
Grandmother's Pattern Book » Necklaces to Crochet – free patterns
This is a pattern for an adjustable ladder ribbon necklace. Length may be adjusted from 18 inches to 30 inches. For this pattern, you would need 3 pony beads for adjusting the length. (See above Materials for crochet hook size). To make necklace: (Make 3 or 4 strands using East Track II or Ladder Ribbon Maxi; 6 or 7 strands using Ladder Ribbon or Ladder Ribbon Glitter)