What is the ruling on zakat for gold for someone who owns 110 grams, and how is the zakat calculated, and should the price of 21-karat gold or 24-karat gold be used in its calculation?

Zakat is obligatory on gold if it reaches 85 grams or more and a year has passed on it. One-quarter of one-tenth (2.5%) of the gold itself or its value at the time Zakat becomes due must be given every year.