I usually work in precious metals but this customer reallllly
wants tungsten or titanium and I have already made him a stainless
steel ring for the engagement ring.
both should be possible - I've seen both materials used in rings.
but the approach would have to be: start from stock material and
remove material until you get the desired shape.
for WC, I'd look on the internet for existing products.
for Ti, I'd look for tube stock...
Dr Paul van den Bergen