The following Clan Members teach the Jeweler profession:
Amakna - Traff Algar Square: Georgiana Marni
Bonta - 5th Bond Avenue: Nina Richa
Brakmar - Scara Pass: Sarko-Phagus
Sufokia - Unna Bridge: Violet Cotton-Socks
You can learn jeweler from any Clan Member as long as your nation is allied with the nation the Clan Member is in. The Clan member can also give back their proffesion's tool in case you dropped it.
Looking after the Family Jewels
First of all, as a Jeweler you will be doing a crafting profession. So you won't be able to harvest and you will need to get a Permit.
The Jeweler makes amulets and rings.
The main ingredient he'll need will be stones which he can get from Miners.
Once he's gathered all these ingredients, he has to go to the nearest Setter to make his creations using the machines available.