I don't know. I always recommend new guys become more than proficient with synthetics before traveling down the natural road, Especially Jnats. Unless your a Geologist. You need to walk, before you can run. Way too many variables with Jnats, Too many counterfeit stones, and don't get me started on the vendors. I could tell you stories that would steer you clear from Jnats forever, and I'm talking about reputable vendors. Just be careful. That's all I'm saying. Everyone's nice in email when they're trying to sell you something. Don't be Naïve. Make sure you can return the stone, and find out under what conditions. Many vendors will not take back a lapped stone. Also, unless your a dealer or a serious collector, A $3000.00 stone does not equal a $3000.00 shave. Know what your buying. Always use Paypal.
Unless you grew up with they guy your taking a chance. How many guys bought bad stones and didn't send them back because they thought it was them? or perhaps the razor? They set it aside, buy something else and forget about it. Before you know it, a year has gone buy and your stuck with a paperweight. Buying up Jnats like they're MRE's and we're on the verge of the Zombie apocalypse is not the way. I've seen guys on here buying 1/2 a dozen of them at a time. I'm not sure what that's about. You should take your time to learn your stone, especially a natural.
I use the Shapton GS series up to 16k, followed by the Suehiro 20k. It's an awesome shave, period. Just pick a set of stones, and master them. You'll be very, very happy with the results. I do own and use Jnats. I like my Nakayama Maruichi Asagi, and my Nakayama Maruka Asagi. The Shoubudani Asagi and Ozuku are fine too. My Maruka and Maruichi came from Japan from a trusted source. They love hard steel.
I agree with RegulaJoe's, # 15 above. Exercise Caution....And...(Edit....Sorry...!)
Happy New Year....