They work well - as long as they don’t get hot.
Slow and water …yay adventures!!
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If you use the hot glue method, here’s a glue tip: rubbing alcohol will remove hot glue from any hard surface almost instantly. Just put a little bit on the joint, it works its way in and the glue pops off. It’s amazingly effective.
Caveat: test the method on your materials before you use it on a final piece, I don’t want you to wreck anything following my dumb suggestions 
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Ha I love dumb suggestions!! Worked with them most of my life.
Oooh! Nice designs! 
Any 1 Know the Power Settings 4 Agate? Would Rather not wast any Slices if I don’t have 2…
Respect
Looks Clean A/F
Natural materials are going to vary, so the best you’re going to get is a estimation. I’d say your best bet is to search for stone or tile settings and get a sense of what makes sense as a starting point.
Unfortunately there’s no substitute for material tests.
Do a search for agate. Someone did some back last year when that teeny tiny Greek engraving popped up in the news.
Did 30 power and then 200 speed , but played around some were 40 and 300 with 2 passes. Just do one pass if you don’t think its dark enough raise the power a little and run another pass or passes till you like what ya see…easy peasy 
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Hi quinnone2,
I’m a newbie and one of these reasons I bought the GF was to engrave agate! EXACLTY what you’ve done here with simple designs. my agate slabs average 0.21" thickness. I clicked “unspecified material” since it wasn’t in the drop down then got the “danger danger” warning that freaked me out… can you tell me the settings you used?? I’m very much a newbie. another user pointed me to your post. any information you can give me is GREATLY appreciated.
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I just read your other post noting power and speed you used. If you’ve found a better speed/power since please let me know. thanks!
Here is some more agate porn:
And here are some settings, from not exactly this kind of agate, but at least it is polished rock:
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I am anxious to see someone try sardonyx as it is clear to white when dug up but yellows to bright reds when heated. shatters when heated too fast but since the laser is so focused I am hoping it will color without blowing up.
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wow… that is awesome. she will love it! what settings did you use? power and speed. and did you have to put any transparent film over the stone to engrave?
sorry just noticed your settings notations
Not my post. I just remembered them and knew what to search for.
Did you put any masking film over the stone? Or engrave straight on there…
You don’t need to mask stone - it doesn’t burn. (No smoke and char.)
But don’t look at it while it is lasering.
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Rookie mistake. I used making on my first pass…just to be safe. And or course I have a very WHITE engrave. 
Test it on scrap or bad pieces first - the stone sometimes shatters/chips in unexpected ways…(it’s not uniform.)
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