Boron Cantilever and Ruby Cantilever, Why Ruby?

Raul is correct about Be. But nearly all heavy metals are toxic, if enough of any one of them enters one's system. Some, like Be, more than others, like boron, of course. I was originally just jesting as regards the tiny size of a cantilever in relation to the potential for actual toxicity.

And I agree with Raul on the qualitative effects of changing the material structure of the cantilever, although I would not claim that I can listen to a cartridge and tell you whether it has a Boron or a Ruby cantilever.

Sorry about my error. I just remembered one of the reasons Shure discontinued the V15 was the toxic material in the catilever...

Tzh21y, If you just need a retip and have not broken your cantilever then Soundsmith can replace the stylus only. It cost more because it is more difficult to do. I believe it is $450. Probably still cheaper than a trade in though.

Non-audio curiosity: I know that Berylium is toxic,
but I've not heard that Boron is toxic.
No arguement, just curious.

Both Berylium and Boron are toxic, but in two very different doses. You actually do need a certain amount of Boron and you'll get that through apples, leafy greens, grains, certain level in drinking water and/or multivitamins. In large doses, it does get toxic.

Berylium is really only dangerous when airborne, so machine shop working with beryllium will have very strict safety policies and safety procedures. Otherwise, you'll be fine (unless you decided to chew on the beryllium cantilever, but that amount probably won't do you too much harm although you may want to have your head checked if you do chew on it)