This app is developed for goldsmith retailers by a goldsmith.
Just enter the value of metal 'gold or silver' its weight and its purity level 1-100 percent and you will get fine gold value its costing along with GST of 3% by one click only.

You can save whole data locally in your phone as well.

*purity (0-100)% : for instance 22k gold equals to 91.66 percent of pure metal and rest added alloys.