Is it possible to use the FIR amethyst mat with silicone implants or titanium rods?

Infrared rays may warm silicon implants, so some safety precautions should be taken if you lay with implants in direct contact with the mat. 

If one has breast implants but lays face-up, there should not be a problem. 

Usually, the silicon used in medical implants is known to melt at over 200°C (392°F), so it should not be adversely affected by infrared rays. 

Titanium implants usually reflect FIR rays, so they should be generally safe. But certainly, if you feel any discomfort where they are, it would be better to decrease heating temperature and procedure length.

Titanium is only slightly magnetic. It does not perceptively interact with static magnets or PEMF, so it should be safe for such therapy.

But still, it is advised that you consult your surgeon and possibly a representative from the implant manufacturer to be certain before using the mat on high heat levels.