Acquiring concentration in one's duas and salaah

Q: Please advise how to soften my heart. I recently cannot cry. No matter how afraid I am of my sins and meeting Allah Ta'ala, I cannot cry when making dua. If it's my medication, do I stop it? What if I battle without my medication? At the same time, I'm worried about becoming hard hearted. 

I also cannot concentrate at all in my salaah. How do I become a better Muslim?

Telling witnesses prior to issuing the talaaq that he does not intend giving talaaq

Q: I’d like to know if the following fatwa is authentic which I found on a Hanafi website.

“If a person holds two persons as witness, before saying these words, that he does not intend issuing talaaq and he is only saying these words on his wife's persistence, then talaaq will not be effective.”

Women wearing rings made of stone

Q: Could Mufti Saheb kindly advise if women are allowed to wear rings of stone. 

Alhamdulillah I have learnt that women are not allowed to wear rings of different metals besides gold or silver. But, are women allowed to wear rings completely made of jade, agate, other stones or possibly, other materials such as plastic?

Repeating the salaah performed on an aeroplane while seated

Q: I read in one of your fatwas that if a person is unable to pray standing in a plane and therefore prays seated, they must repeat the salah later on. Is this because 

* The first salah was invalid - so that they should intend qada when they repeat it? 

* Or was the first salah valid (i.e. fulfilled the fard) and the second one just a repetition of it in a more perfect manner?