What is the minimum threshold (Nisab) for Zakat on gold, silver, and cash?

Zakat is obligatory (Fard) once a lunar year has passed on wealth that meets the Nisab. 1. The Nisab for Silver is 52.5 tolas (approx. 612.36 grams). 2. The Nisab for Gold is 7.5 tolas (approx. 87.48 grams). 3. For cash or trade goods, if their value reaches the equivalent of 52.5 tolas of silver, Zakat is obligatory. 4. The rate of Zakat is 2.5% (one-fortieth) of the total value. 5. Zakat is not obligatory on items of personal use, such as a house to live in, clothes, household furniture, or tools of trade, regardless of their value. 6. If a person has both gold and silver, but neither reaches its individual Nisab, their values should be combined; if the combined value reaches the silver Nisab, Zakat must be paid.