Zakaat on a gold plated necklace

Q: I would like to query regarding 18k gold plated necklace. 

I previously was not aware that zakaat was due on my 18k gold plated necklace. I'm not sure how long I had it in my possession. I am just going to estimate 13 years. I recently also gave the necklace away within this current year. 

I am not sure how much the necklace weight is: will estimate 18 grams, since I am not sure of the percentage/weight of the "gold" in it. 

Will it be okay if I calculate the zakaat on the current selling price of the necklace e.g. The current selling price is R1200 and then to make up for the 13 years =R 15 500 and then pay 2.5% of this amount, will this be allowed ?

Fabricated Hadith regarding the virtue of an Aalim

Q: Someone has mentioned to me that if an aalim passes by a qabrastaan, then the people that are going through difficulties in their graves will get a 40 day break from punishment. The person who told me this, said that this is a hadith. Is this true and is it really a hadith? Is there anything similar to this found anywhere? And what are the true virtues of an aalim?

Wearing an adult diaper in ihraam

Q: I am a 21 year old male who consistently suffers from urinary incontinence. I usually place a piece of tissue in my underwear after urinating just incase some urine drops may come out. 

I plan on one day going for umrah but I am afraid that my condition may cause difficulties especially if I should need to use the toilet whilst in ihraam. How can I possibly solve this issue as a whole? 

I have also read from a previous post that it is permissible to place a bag or wear adult diapers under the ihraam, in such a case does the diaper have to be without any stitching or sewing and how would one secure a bag to ensure it doesn’t fall out?

Woman in haidh or nifaas touching the pages of dua kitaabs

Q: A woman is in haidh/nifaas and wishes to read Munaajaate maqbool/40 durood and salaam. In the munaajaate maqbool on one side is Arabic and 1 side english and in the durood kitaab it's all Arabic. 

1. Is it permissible for her to hold the corners of the page and read from the kitaabs? 

2. If she's read before and mistakenly her fingers touched the arabic text, does she need to make taubah from this? 

Sometimes when reading kitaabs, when turning pages fingers mistakenly touch Arabic/ Quraanic text due to not knowing what's coming on the next page. Sometimes also when not in haidh/ nifaas but not in a state of wudhu. 

3. Should one make istighfaar/ taubah when this happens?