I have been working with investment castings for over 20 years, initially in aerospace and medical industries, and starting out in the jewelry industry with platinum in the mid 90's. My company, TechForm, now focuses on platinum, palladium, and stainless steel contract casting primarily for the jewelry industry. We cast only high temperature metals and use a shell system rather than a standard investment system for our castings. We are also experimenting with titanium casting and will consider adding this in the first quarter of next year.; techformcasting.com