Are you sure that’s diamond? Was not aware diamonds are found there. Looks like Quartz to me from the photos. I have a tiny diamond crystal from the Wyoming - Colorado border, Kelsey Lake area.
Looks like quartz to me as well. Diamond crystals don’t form like that.
It’s NOT a rough diamond. Take a specific gravity and you will see. Diamond SG = 3.52 and Quartz SG = 2.65. Rub the rock HARD on a piece of emery cloth (hardness 9). A diamond will destroy the emery paper down to the backing. Emery paper will just about eat everything else. Type 2a Diamonds have next to zero Nitrogen or other impurities in them, so they generally look clear as glass. There are also NO Trigons on the surface of your specimen … so no cigar! ;)) You can always fly into Vegas to my Lab and I will be happy to test it for you right in front of you. Michael at www.thediamondgrader.com 
Sorry, I suppose I could have explained why I thought it was diamond. First, it is harder than quartz (it will scratch quartz and not vice versa. Second, it has cleavage. I have had many geologists confirm this. It also displays signs of being hydrophobic and lipophilic. So, although gemologists continue to identify it as being quartz, geologists confirm it is not. So, maybe it is not diamond, but can someone help me identify it properly then? According to these and numerous other characteristics, it is not quartz, in my opinion.
I agree, definitely NOT diamond. Diamond rough like that would make headlines. 
Can you take an RI reading?
There were diamonds found on Goose creek close to the McCall, ID. area many years ago. My understanding is even though they were very poor quality one of diamonds was a macle of around 30cts. However I agree these appear to be quartz.
Surely there are plenty of registered gemmologists in your area, instead of all this guessing via a photo and not a real good one at that, take them to one and you will know for sure what you have, a simple SG test would be easy to do
Unfortunately, I have not been able to find an honorable gemologist in my area. I am not saying that there is not any, but I have not found one. I have done a SG test (although with primitive tools) and I calculated 3.4-3.5, and again, I cannot find anyone to perform an accurate SG test on it yet.
BH_GEMS,
Those are nice specimens, but like you said “usually.” As you most likely know, nothing can be 100% all of the time (except laws of nature of course!). I have some tumbled rough as well, but this stone is massive. So, it would inherently have dissimilar, as well as, similar features and characteristics–one being an adamantine luster.
J
Teresa,
Although I disagree with you first comment, the latter is only true because I have been in sole possession of the mineral. It has not hit headlines yet because I have not gone public with it, until now.
Gemcuts1,
Are you implying that quartz crystals grow like my piece, then? Because unlike quartz, diamonds can form in many fashions and undergo extreme dis-figuration while surfacing in kimberlite pipes. So, although it may look like quartz in the picture, physical and structural characteristics prove it not to be.
I think your only real solution is to send them to the GIA, This will be accurate and final and prove beyond any doubt what you actually have
Good Luck, let me know the results
You must forgive us for being skeptical. The photos of rough you provide are, for diamonds, large to humongous and well above the size found most places, let alone Idaho, which has produced few diamonds and probably none over 30cts. I can’t tell the exact weight of what you have, but even the small pieces are 10 cts or more, and the large pieces quite a bit more than that. There aren’t any recognizable signs of diamond crystal habit in any of the pieces. Yes, it is possible for water worn diamonds to show little crystal habit, but yours are not water worn. Beyond that, none of the pieces you show seem to have areas of transparency, so, even if they are diamond, they are not gem diamonds. It just doesn’t look like what you have is cut-able for jewelry at all.
You can do hardness tests with a piece of synthetic corundum or a piece of silicon carbide sandpaper. Either of these would scratch anything but a diamond. You’d’ have to discuss how you did your SG test to arrive at ~3.4. You should be able to find someone to help you AND witness an SG test. You could also buy very cheaply a thermal conductivity probe which differentiates diamond from all but moissanite. The form of your samples pretty much rules out moissanite. so if the thermal conductivity probe indicates diamond, that is persuasive. These days, $10 gets you a diamond tester off ebay good enough for your purposes.
The fact that none of the fairly knowledgeable individuals from this forum have wanted to go further with these stones should indicate to you that the chances that they are diamond are slim to none. Sooner or later you are going to have to find someone to trust who has professional qualifications to verify your stones. The fact that you haven’t adds to my skepticism.
Good luck with your stones. Let us know what you find out.
Royjohn,
Thank you for your thoughtful reply. I agree, I am baffled as to why I cannot find anyone in my local area to verify my stones for me. Furthermore, currently I am a student at the local community college, and own membership to various clubs, groups, and organizations in hopes to find an answer. Like I stated in a previous post, I am caught in a catch-22. Whereas, although gemologists tell me it is definately quartz, geologists confirm that it is not. The former has, for the most part, given me the cold shoulder, and the TWO that have performed a “RI” test on them, wont let me watch them conduct the actual testing. Moreover, the “test” lasts less than a minute and the stone comes back dry (no oil on it). At one of these shops, I had them test a colored stone as well, and they stated it quartz as well, topaz. When I brought the stone to a private dealer, who would only test colored stones for me (but would let me watch), found it to be fire opal. The latter has no comments other than confirming my arguments that it is not quartz.
So, I am lost. I am getting ready to jump on a bus and head towards Las Vegas or LA or Phoenix or Tuscon or where ever I can find someone to actually LOOK at my stone and tell me why they think it is what it is. Not just tell me NO. If you have any suggestions, I am all ears (well eyes…).
Best regards,
Joshua
Hello,
Do not give up on trying to identify your gemstone. Most will just assume it is not a diamond, however, diamonds are more common than they know. They are finding new finds all the time, and diamonds are found in areas where there is also quartz , and many other gemstones. Quartz does not flouresce, where many diamonds do, also water beads up on a diamond, you cannot read a newspaper print through a diamond, and other ways to tell the difference. I have found many gems while looking for gold where they are not supposed to be. Only it has taken me years to figure out how to clean 1000yrs. of compacted pollution from them. I also have some roughs, and was finally told to have cut first after finally speaking with a reputable source. I found an assayer who had million dolllar machine that tells the minerals in a “rock” If you have it cut, know the cutter. I hope you have a real treasure…
Thanks, know1uknow. I am open for any suggestions on where (or who) to get a real interpretation of the mineral. I have exhausted my local resources, and money is preventing me from expanding my search elsewhere. Please let me know if you can help.