Hi Kamal,
Blue sapphire recommendation is probably made based on lagna kundali. However, if planetary position is also studied wrt to moon, Saturn is not really favoring. It’s aspects are also not very favoring. So, despite the Saturn is yoga karak for libra ascendant, I would not suggest blue sapphire.
Keep your sugar levels in check and right ear.
If at all your would like to put on a stone, you shall try diamond.
Thanks
Vivek.