There is no foolproof way. Sometimes the glue has dried out and it pops out easily. Sometimes it's made a semi-permanent bond with the wood and you'll damage either the box or the stone getting it out. Sometimes it's been re-glued into the box and it's not coming out.
Put a folded up towel underneath to catch the stone if it does pop out.
Turn the box upside down over the towel. Tap the underside of the box a couple of times with something rubberized so as not to damage the box. Like the handle of a large screwdriver.
If it doesn't pop out, try to pry it out with your fingers.
You could try one of those plastic knives like you get from fast food places. Wear gloves and glasses so that it doesn't it doesn't cut you or hit you in the eyes if it breaks.
A heat gun/hairdryer might also work to loosen the glue, but I've never tried it.
It's definitely not wedged in there as there as it has a 1/8" gap all away around it. It's one of the boxed water hones with the hinged lid. On one of the ends I can see the adhesive on the bottom. The last one I had it looked like someone had pulled it out using a lot of pressure as some of the stone was still stuck to the adhesive. I remember reading somewhere that heating it to 200 degrees in the oven would loosen the adhesive but would like other input before I try that. It definitely isn't coming out by trying to pull it out with my fingers as I have already tried that.
Get a nice Double Duck spike point, and scrape the tip of that baby around the edge if the hone, and try to loosen the glue bond. Gently work the tip under the edge of the stone and try and pry it off of there.
If the tip of the razor busts off, that means you'll have to get something more high quality like an Iwazaki or order up a Zowada Damascus. Those razors can pop stones off wood backing like nobody's business. The more expensive the razor the better it'll work....
I just put it in the oven for a little over an hour @ 190 degrees. It didn't just pop out, it took some serious prying but it came out, so thanks for the advice, especially Seraphim!
I have been waiting for a month now on the Zulu Grey stone and it still hasn't shipped! It is mostly my fault as I decided to go with a larger stone so I got bumped off the most recent shipment, since he has to cut, shape and lap all of these stones himself, so I am pretty disappointed to say the least. He said the next round of stones should ship in a week or so, we'll see. This is the longest I have waited for a shaving item and I'm not a very patient person so this is really trying me.
Yeah I'm sure it will be worth the wait, but after a month I'm starting to wonder. He said he'll soon have a storefront open so no waiting, other than shipping time, and in hindsight I should have just waited until then.
Yes the shipping charges are high, but I'm sure it's a heavy chunk of rock and it's coming from South Africa so I would expect the prices to be pretty steep. I am still going to get one (I've already paid for it) as the reviews state that it's a nice stone. I guess my rant was based on the fact that I found out yesterday that I was going to have to wait until the next round to get my stone. Sometimes I forget the fact that he cuts, shapes, laps and packages all of these stones by himself and he has a full time job as well. He has put alot of effort into finding a new natural stone for straight razors so I'm excited to get one and add it to the arsenal.
Rschan, did you already pay for a stone or are you just thinking about it?
Just thinking about that , Then I purchased a Thuri just like yours few days back. So now I'll wait for while and try this thuri edge. If I feel that I'm needing more refinement will think about a Zulu. Smallest stone alone costs as much as $128/-. That is what is holding me. More than the Zulu I'm interested in having a Cretan for bevel setting.