This is a nice piece that may appeal to people like myself that simply appreciate quality, or the narrower fringe of geo minded rock jocks getting a charge out of slipping a ring of polished agate on their cock.
Despite not being a rock expert the thing appears to be of incredible quality. Perfectly smooth, polished rock. No fractures, nicks, or sharp spots that could cause discomfort or injury during the sex process.

Being rock it is sturdy and bears a significant weight to it(probably less than metal). But having been milled to the extent that it has to achieve this shape I would assume it to be quite brittle and would not recommend throwing your agate cock ring at hard surfaces. The color is a strange dark luster; appearing to have a mild burnished style polish overlaying the blackish matte color of stone. Overall this makes it appear much more high quality than your standard polished agates and hematite rings that you find sold at strip malls and national parks. There is a considerable thickness to it, both hieght and girth, which allows it to be noticed in use by both partners.

Unfortunately for me it didn't fit very well. I ordered the smallest size 1 3/4" ring thinking hey it may be on the small side but at least I'll cram er in there and get some use out of this little bugger. I was mistaken. My penis was definately not ample enough to create a firm grasp, or any grasp at at all for that matter. I haven't measured my penis nor the ring as the disappointment has killed motivation to do so. However, I strongly recommend that you attain the circumference of your cock before ordering this. I can wear a standard Magnum size condom comfortably and at around 7" assume I'm a little over average... but, A vague estimation would be that if your penis doesn't resemble the thickness of a beer can than this probably isn't for you. I did use it for the sake of using it and it flopped all around, had a nice coolness and weight to it but overall my test run was not as it was meant to be used.

There really was no suitable way for me to use this. My only hope was to cram the twi and berries in there to achieve a semblance of a snug fit. But that seems impossible in all conditions. I'm hoping I run into a hung gentleman I can bequeath this too. Because for the right person it would be awesome.