When I saw this 4-petal green carved flower (Agate or Prehnite, I can't tell), I knew exactly what I wanted to do with it!
These are all brass components. There are not many elements on it but it is already an eye-catching piece and it stands out against the skin.
There are freshwater pearls of various sizes along the chain. You wear/remove the necklace with a toggle right at the chest. Chain is slightly longer than choker. It rests nicely at the collar bone.