I can tell that you are using my mod because of the tools; while still uncommon diamond armored mobs are nowhere near as rare as they are in vanilla, where they have a one in 15551 chance at the maximum regional difficulty. For comparison, in my mod the chance is one in 1667, or about 9 times more likely; even the chance of amethyst is one in 5000 (1250 for either, which corresponds to the chance of diamond in vanilla), all on Normal (on Hard the chance of armor is 50% higher, thus the chances are one in 1111, 3333, and 833 respectively; on Easy the chances are all half as high, which still means that even amethyst is 50% more likely than diamond in vanilla).
Also, in vanilla they are effectively even rarer unless you stay in the same area, particularly since 1.8 because of the changes made to regional difficulty (it has no effect at all on Easy, so armored mobs never spawn where before they could on even the first day*, and otherwise it has no effect until you spend enough time in the area on Normal. The value displayed in the debug screen does not mean much as it is internally scaled from 2-4 to 0-1 so only that small range is relevant; the full range is 0.75-1.5 on Easy, 1.5-4 on Normal, and 2.25-6.75 on Hard). Note that in any case the chances of different tiers of armor are independent of difficulty.
*This is because the first day is a full moon, which adds to the difficulty factor; I recently updated my mod so Day 0 is a new moon so the factor truly starts at 0; the difference between /time set 18000 (midnight of Day 0) and /time set 114000 (midnight of Day 4) is quite noticeable (in a new world as once the total time played gets high enough moon phase no longer has any effect except for slime spawning in swamps. On Normal Day 4 is halfway to the maximum difficulty on Easy (the time factor is negligible at this point as it takes 100 hours of playtime).
I was using your mod. Did you update to Version 5 and have a download link yet?
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What was the seed for that world?
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I was trying to install Optifine with your mod, but it didn't show Optifine.
How do I install Optifine with your mod?
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Lower your render distance.
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I found a diamond armored skeleton yet again.
And guess what?
It dropped diamond leggings, which have Protection III. And this was the 2nd mob I saw with diamond armor this week, which is rare.
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Your done playing the other world?
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I have found a diamond armored skeleton while in a stronghold with a ton of mobs on it. I also saw a ton of iron armored mobs today.
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Another question, do skeletons get Punch II on Normal Mode on your mod?
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How do mobs spawn like that in a small spot?
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I have found a diamond armored skeleton in my world. (The 3rd one I've ever found in this world.)
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Is this mod compatible with Superflat Caves?
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How did all those mobs spawn in that cave?
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I actually didn't realize you can do that.
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Recently today, I've found some interesting stuff.
First, there were a lot of mobs that spawned in my old area.
http://imgur.com/a/MyNTT
Then, I found a mob spawner.
https://imgur.com/a/cttsB
I also got a Sharpness II from a zombie.
https://imgur.com/a/2mCzh
I moved into another house in my world.
https://imgur.com/a/Vfd81
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I play on Normal/Hard on my world.
I have seen diamond armored zombies on both Normal and Hard.
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I was using your mod. Did you update to Version 5 and have a download link yet?