The one who wears this ring will be under the direct protection of Shiva and Shakti.
The Matter and Energy.
Preferably, You do not buy it. or pay for it , it is only a blessing which is free of any charge.
One has to Recieve free of charge from your own Guru as blessings.
Every day chant "Om Namah Shivaya". 108 times and wear this.
Remember Sri Yantra, draw it with your own hands daily and meditate and see the benefit for yourself.
You will get insights about yourself and the world around you.
If you get it made from a craftsman , inform him about this and tell him to charge only for his labour and the profit if you wish give him. Order For Two , One for your self, the other to be given free, to the person whom you think is capable of wearing this ring.
If you can manage to make this on your own nothing like it.