Just receive and done first testing Jerry's steel styli.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=281196676466
I've take cone ones and try to emboss with them. With comparing to sapphire.
Anything was done as usual - WD-40 for lubricating, 60-70C heating with lamp.
Jerry's cone:
https://dl.dropboxusercontent.com/u/1235999/steelstylitest/saph_test.wav
Sapphire:
https://dl.dropboxusercontent.com/u/1235999/steelstylitest/steel_test.wav
I've experimented with steel before and Jerry's styli works very good for steel, but as you can see sapphire is out of competition.
Can't say how much they will last. This needs to do different research
![Smile :)](./images/smilies/icon_smile.gif)
Good luck !
Sergey