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I also got 2 Ruby Red stones that they sell from China because Michael Christy mentioned in a youtube video he really liked the Ruby Red stone and although he did not say it came from Gritomatic he use's the Venev stones so I'm going to guess the Ruby Red he use's is the same one they sell and that's where he got it from.

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CBN offers excellent performance in sharpening knives of any steel. Due to its high resistance specs, CBN can be used dry without lubricant. This makes CBN the cleanest of the available sharpening stones. How to use CBN’s qualities include its high levels of high hardness, strength, abrasion resistance, and thermal and chemical resistance. These characteristics exceed the values of synthetic diamonds and conventional abrasives such as silicon carbide and aluminum oxide. In particular, CBN’s high thermal stability and chemical resistance make it suitable for sharpening in conditions where synthetic diamonds are not normally employed.

The vanadium carbides are approx 15 microns in size,,, you need a apex under 1 micron for maximum shaving sharp efficiency. There are several reasons that CBN is worth considering for your next sharpening stone. Most important is that CBN is harder and has greater abrasion, thermal and chemical resistance than either synthetic diamonds (though less so than natural diamonds), silicon carbide, or aluminum oxide. Unlike other bench stones, you can use it dry (without any lubricants). It never requires flattening (though in all fairness neither do diamond stones) and it will sharpen any tool steel, including the S90V produced by Crucible." Sharpening stones can be divided into two categories. Natural sharpening stones and synthetic sharpening stones. Natural sharpening stones are just that, natural stones. These stones were taken from a quarry. Synthetic sharpening stones can be comprised of different materials. The synthetic materials used most often for sharpening stones are ceramics and diamond. Of course each material has its pros and cons. Natural sharpening stones

I'd personally start with the SiCs to do any heavy reprofiling or chip repair due to their lower cost. The 50 and 100 gold stones aren't much faster than the 140 honestly and the SiC should be a similar speed. Then I'd move to the 600 and 1500 kme gold stones which I've found to be very nice and high quality. After that I'd microbevel on the sharpmaker rods of your choice, depending on whether you want a toothy or fine edge. If you reverse those two categories of stone for each role (shaping vs sharpening), you have made your job much more complicated and involved and in general it will take you much longer and/or require elaborate deburring steps. With something like a simple Naniwa Multistone 1000 : one can literally grind all day with a creamy slurry created by just a few passes of a flattening plate like an Atoma and NEVER actually reach a strong burr or sharp apex.

CBN offers excellent performance in sharpening knives of any steel. Due to its high resistance specs, CBN can be used dry without lubricant. This makes CBN the cleanest of the available sharpening stones.Metallic CBN Sharpening Stones from Poltava Diamond Tools are used for sharpening knives using guided knife sharpeners (Hapstone, TSPROF, and other Edge Pro-compatible sharpening systems). CBN (Cubic Boron Nitride) is the second-hardest material after diamond. Metal bonded CBN stones utilize copper-tin alloy bonding for high endurance and low wearing rate. Poltava Metallic CBN Stone for Hapstone Edge Pro TSProf Sharpeners HPCBN ***Grits ranging from 800 grit to 8000 grit. Select from the drop down above*** ***ALL grits are JIS. See Table Below*** There are many different types and sizes of sharpening stones. In this topic we discuss what materials are used to produce sharpening stones and what the (dis)advantages of these materials are. As such you can decide which material will suit you best. Let's start with the short version. Are you interested? If so continue reading to find out more in the extended version! In a nutshell: Woodcarving Carving Sets Full Size Carving Tools Sculpture Tools Palm Carving Tools Carving Knives Carving Accessories Power Carving Tools Burrs & Accessories