Will this be good for a ka bar?

Yes, But the K-Bar blade should be in excellent condition,because this is a very fine finishing stone for that mirror finish.

Is there a noticeable difference between the 8K in the 12K sharpening stone? Is it worth upgrading if you already have a 8k stone

It all depends on what you want in your sharpening toolbox! I have a 250, 300, 500, 800, 1K, 2K, 3K, 4K, 6K, 8K, 12K and 16K Stones... My 500 grit, 1k and 3k are showing noticeable wear on the stones... 8k and 12k are used for polishing my knives or chizels! But, I think the 12K natural stones a winner an extremely hard stones! With these stones you have to build up a slurry before honing! Good Luck... I love mine... and it comes in a NICE leather carrying case with a soft rubber surface mat for the stone...

What is the main abrasive in this stone?

The natural "Ocean Blue" Tsushima whetstone was supposidely quarried from a now closed underwater mine near South Tsushima Island. It is implied that this is a natural stone and not man made. As far as the exact type/material of stone, I have not been able to find any conclusive information on this nor any information on the mine itself. Out of all my stones, this one is probably my favorite. It is dence, yet forgiving. I use it as a polishing stone after using my ceramic shapton stones to sharpen my edge. I would say mine is more like an 8,000 grit, but that's not to say the stone you get couldn't be closer to 12,000. They are natural after all.

Is this for sharpening or honing or polishing?

It is mostly for honing and polishing; with a proper preparation (a 6-8K stone), this jnat will produce a mirror, razor sharp edge.

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⚔️ Sharpen Like a Pro, Own a Legend

PERFECT SIZE WEIGHT - Compact 8.0"x2.7"x1.0" and just over 2 lbs—ideal for your kitchen or workshop without bulk.
EFFORTLESS WATER ONLY USE - No soaking needed—just water for instant, hassle-free sharpening that fits your fast-paced lifestyle.
DURABLE DENSE COMPOSITION - Medium-hard stone (3.5-4/5) with high dish resistance ensures consistent performance and longevity.
EXCLUSIVELY SOURCED OCEAN BLUE - Sharpen with a rare stone from a now-closed underwater mine near South Tsushima Island, Japan—limited stock means elite status.
PRECISION HONING AT 10 K 12 K GRIT - Achieve razor-sharp edges with ultra-fine grit designed for professional-grade blade refinement.

The Masuta Natural Sharpening Honing Stone is a premium ocean-blue waterstone quarried from a now-closed underwater mine near South Tsushima Island, Japan. With a fine grit of approximately #10K-12K, it delivers exceptional sharpening and honing performance for knives, razors, and other blades. Its medium-hard, dense composition offers high dish resistance and long-lasting durability, all in a compact, easy-to-use waterstone that requires no soaking—just water.

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