Convert into passive voice
1)Gold jewellery bought and sold
2)I admire the way you keep your cool in the heavy traffic.
"Gold jewelry bought and sold" is passive.
It's short for "Gold jewelry is bought and sold [here].
You'd most likely see this as a sign in a store window.
Jewelry, by the way, is the North American spelling.
Sentence 2 is good English.
But you would never put it into the passive.
Putting both verbs into the passive, you'd get a monster like "The way your cool is kept in the heavy traffic is admired."
wishing you success