How are Sterling Silver Charms Made from Fingerprints?

Question
I have purchased a sterling silver charm with my daughters index finger imprint. I saw how the woman took the impression of my daughters finger in what looked like a molding clay, and then 2 weeks later I received the charm. I don't believe that this is a hard process. I was wondering if you could explain the process in which she might have used, melting the silver, pouring it into the mold, and removing the finished product. I would love to be able to create these charms myself and hopefully save some money as well.
Thank you for your time and I look forward to your response.

Answer
Greetings, and I apologise sincerely for my slow response as my All Expert e-mail have been getting redirected to a sub folder by the server.....ah the joy of modern tech.

I have answered the question of casting previously - you should read my previous responses.

This is an interesting idea and quite simple to achieve as well.

With the master print you would press or melt wax into the impression so that you had a positive of the finger print.
This would then be shaped and attached to a casting tree or sprue.
The tree would then be placed in investment plaster which is baked in a kiln top around 950C. The wax melts out during this time leaving a hollow form which can be filled with molten silver.
The silver piece can then be finished as a piece of silver jewellery......
If you can make a wax form, then you will be able to have it cast by a silver caster, which is probably the easiest way to begin, with the least outlay.
Usually a caster will charge you a casting fee plus material by weight.
Hope this is of assistance.
Cheers, P