Q 1: Is it Haram (prohibited) to save
I bought one gram of gold with one dirham and after the passage of one Hijri year, the price of the gram went down to half of a dirham and the next year it increased to five dirhams. Is this a kind of Riba (usury/interest) or Haram?
It is permissible to buy gold in exchange for another currency other than gold hand in hand, as it is allowed to save, and sell it for more or less than the purchase price. This is not considered a prohibited amassed wealth if its Zakah (obligatory charity) is paid.
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.