a necklace of pearls的用法和样例：
- She was wearing her pearls(= a necklace of pearls).
- She wore a necklace of hyacinth.
- He gives her a necklace of proof gold.
- She bought a necklace of crystals.
- He gave her a necklace of crystals as a birthday present.
- The gods left Olympus to honor the occasion with their presence, and Vulcan presented the bride with a necklace of surpassing brilliancy, his own workmanship.