Jewellery and Rings

Q:

1. If women have gold, silver, and diamond crucifixes, aum, and Buddha jewellery before excepting Islam, what should they do with them? Should they have them melted and redesigned or should they bury them?
2. What is the punishment for Muslims selling jewellery for kuffaar religions?
3. Can Muslims wear jewellery that has the name of Allah and ayaat from the Quran in lockets when we don't have wudhu?

Q: Are female muslims allowed to wear anklets?

Q: 

1. Is it Sunnah to were a silver ring?

2. If yes to the above question. Must it be pure silver? Should something be inscribed on it? How must it weigh? Which hand and finger to wear it is Sunnah?

Q: Please let us know whether men can wear white gold? I.e. gold coated with Rhodium. It is look like silver.

Q: Is a belly ring permissible?

Q: We know that one can only use rings made dominantly of gold or silver. Can one use plastic rings?  Can one sell imitation rings which are impermissible to others? Would it make a difference if the customers were muslims or nonmuslims?

Q: Is it permissible to wear a bracelet made of copper for medical treatment? People who have worn this type of bracelet have found it to be beneficial.