Q 2. If I give some jewelry to my wife, should I include that also in my zakah calculation? Or is that my wife’s responsibility?
Q 3. For nisab amount calculation, should I consider 18/21/22 caret gold?
بسم الله الرحمن الرحيم
(1) After you become sahib-e-nisab and complete one year as per the lunar calendar whatsoever you own equal to nisab or more it is mandatory to pay its zakah. During the year if you receive some amount of the same kind then it shall not be calculated differently rather it shall be included with the already available amount and after you complete the year you will have to pay the zakah of all the amount together. Thus the date in which your zakah year completes for example, 1 Ramadan, then whatsoever you own on this date gold, silver, currency, business materials you will have to pay its fortieth part as zakah.
والمستفاد ولو بهبة أو إرث وسط الحول يضم إلى نصاب من جنسه فيزكيه بحول الأصل (لدر المختار مع رد المحتار، كتاب الزكاة، باب زكاة الغنم، 3: 214)
(2) If you give the jewelry to your wife and make her its owner then your wife will have to pay its zakah as per the zakah rule.
(3) This question is not clear.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.