reglueing blue-yellow combo

I got a very good deal on some old barber stuff, which included a vintage old rock coticule, very flat and in good shape. The seller didn't recognize what he was selling, and listed it generically ('hones from 1908' or somesuch), so I was the only bidder.

The thing is, it arrived today and the two hones here are in fact the blue and yellow halves of an old combo stone. They fit perfectly, and you can see the traces of glue or whatever bonding agent was used. Which brings me to my question. What sort of glue should I use to rejoin the halves? The yellow piece is only about 1/4 inch thick and seems like it could be fragile, and a coticule without either a slate or belgian blue backing seems kind of naked...

I imagine Randy and Howard know the 'right' answer right off the top of their heads, but anyone's input would be much appreciated.

Try Latapoxy 310. It's an epoxy specially designed for stone. Shock and vibration resistant, and, I assume, waterproof.

Do you think I could find that at Home Depot Joe? I can't find it in their online catalog...

I would think any epoxy for non porus surfaces should do the trick.

If you can't find Latapoxy, try JB Weld, which is available in almost any hardware, auto parts or home center store. Extremely strong and waterproof. I have used it for everything from stone and concrete to pro-rally cars and never been disappointed.