What should one do if they have paid zakah on jewelry that was not complete for several years?

Q: After my marriage, I did not know about the zakah on gold, except that what is worn does not require zakah. Therefore, I did not pay zakah on my gold because it is all worn and not saved. However, now, and about four years ago, I heard from your eminence that gold requires zakah whether it is worn or not. So I began to pay zakah on it. Please note that two years ago, I paid zakah without taking the gold to be weighed; rather, I paid based on an estimate and gave the money to the needy. Now, I have taken the gold to the goldsmith, who weighed it for me and told me the amount of zakah due, so I paid it. What is the ruling regarding the years in which I did not pay zakah? And is the zakah I paid based on the estimate valid or not? I ask for your advice and guidance.

A: You are obligated to pay zakah on the jewelry from the time you learned the legal ruling, provided the jewelry reaches the nisab, which is twenty mithqals. This amounts to ninety-two grams, or eleven and a half Saudi pounds, whenever a lunar year has passed over it.
The obligatory amount is one-quarter of one-tenth, which is twenty-five out of a thousand, to be distributed to some of the poor and the needy.
You are obligated to complete the zakah for the years in which you paid based on an estimate, meaning by guesswork, if the amount paid was less than what is due after weighing the jewelry and knowing its price, along with repentance to Allah (Glorified and Exalted is He) for the delay that occurred. May Allah grant success.