Hello,
Im on the path of making an engagement ring for my soon to be wife.
I have never made anything this small, but I am handy. I've been working on bikes for many years and I've got a workshop.
I've also done most of my homework and I got sort of a plan, but I need you help on where am I going to go wrong as a first timer, plus some side questions.
Here is the idea.
I already have an idea of what would it look like - a simple ring with a stone on top of it, 4 prongs, no flowers, no nothing more.
I am able to carve the model in wax, but I am unable to cast it with the lost wax casting method, however I am going to be able to cast it in delft clay, and if it fails - I still have my wax model to try again untill I get it right.
That is the basic idea.
Im not really sure what material to use - silver or platinum. Silver would be cheaper I think and much more doable, considering the melting points.
After the cast I will grind it with a rotary tool I have in my shop, then polish. I've seen alot of videos about it on youtube.

Where am I going to slip up and fail miserably?
Thanks in advance.