how to recognize a diamond?
99018
These are different types of tests on determining the validity of a diamond...\n\n1. The old “If it will scratch glass it has to be a diamond.” Well, it is true that diamonds do scratch glass but so do a lot of the other fakes on the market. To boot, it’s possible to injure your rock even if it’s real during your hardness test.\n\n2. The transparency test. If you flip the diamond in question upside down and place it over some newsprint and can clearly read through the stone, it’s not a diamond. (The problem with this test is some diamonds are cut shallow and can be read through.)\n\n3. The fog test. This test I like a lot. Put the rock in front of your mouth and fog it like you would try to fog a mirror. If it stays fogged for 2-4 seconds, it’s a fake. A real diamond disperses the heat instantaneously so by the time you look at it, it has already cleared up. (A down fall to this test is oil and dirt on the stone can effect its reliability and the test is not accurate at all on doublets where the top of the stone is diamond and the bottom is cubic zirconia epoxied together.)\n\n4. The weight test. The most popular of diamond simulants (fake) is a cubic zirconia. C.Z.’s weigh approximately 55% more than diamonds for the same shape and dimension. So if you have a carat or gram scale at your disposal you can see if the imposter tips the scales too much.\n\n5. The U.V. test. A high percentage of diamonds fluorescence blue when put under an ultra violet light (black light). Since 99% of all fakes don’t, a positive identification of medium to strong blue would indicate a diamond. The bad news is if this method proves you have a diamond, it also proves your diamond is worth less. Diamonds with blue fluorescence are as much as 20% less valuable. Remember, lack of blue fluorescence doesn’t mean it’s a fake; it could just be a better quality diamond.\n\n6. Under the loop test. If you own some sort of magnifying lens, there are some things you can look for on the stone that might give away its identity:\n\nA. Look at the rock from the top and see how well the facets (cuts on top of the diamond) are joined. They should be sharp not rolled. \n\nB. Look at the girdle and see if it is faceted or frosty (a clear sign it’s a diamond) or waxy and slick (an indication it’s a fake).\n\nC. While you’re looking at your stone under magnification, look into your stone to see if you detect any flaws (carbon, pinpoints, small cracks). These are typically clear indications it’s the real thing since it’s very hard to put inclusions in a fake. \n\nD. After examining the stone, focus in on the stamps inside the setting. A stamp of "10K, 14K, 18K, 585, 750, 900, 950, PT, Plat" indicates the setting is real gold or platinum which gives a better chance that the stone in it is real as well. While you’re looking at the interior of the ring, also look for any "C.Z." stamps that would indicate the center stone is not a diamond.\n\n\nHOPE IT HELPS!!
673735
Ditto. Square=3, Diamond=2,\nDiamond+1=Square\n\nSquare+Square+Square=9
706475
get a fake one from swarofsky -- nobody can tell but a jewler
1125843
I don't know if there is a color but the 30th is for Pearl or Diamond
235838
Diamond with a reddish tinge or diamond gotten through betrayal.
1186958
I know the answer. One word. DIAMONDS. lol
202978
To analyze something in an SEM, it needs to be reasonably flat.  To get it flat, it is polished.  The diamond suspension is a mixture of water and tiny diamonds.  It's a very fine abrasive.
56302
Green Circle (easy)\nBlue Square (intermediate)\nBlack Diamond (expert)\nDouble Black Diamond (expert only!)
881405
1. A diamond is a specific type of crystal form of Carbon (contrary to what some people say and what some have answered:  a diamond was NEVER coal -- the only similarity is that they both contain carbon.)\n2. You cannot "make" a diamond out of a crystal.\n3. You can try to cut a crystal to maybe resemble a cut diamond, but no one would ever confuse the two.\n4. Crystals have certain alignments of the crystal facies along which the crystal will split -- it is along these facies that an expert will "cut" a crystal to get a specific shape.
492566
Retail value will be around $25k. However, this is rough since there is not nearly enough information to give an accurate assessment of your diamond.
725185
This is quite common. The color of a diamond is fixed at the time of its creation in the earth's crust, and cannot be changed. Further, the color is an important consideration when appraising the value of the diamond: generally, the clearer the diamond the more valuable. Gemologists use a scale of D thru Z to evaluate the clarity of the diamond, with D being colorless and Z having a quite noticeable yellow hue.\n\nTrue canary-yellow diamonds are quite rare (and therefore valuable), but it sounds like that's not what you have.
869847
I'm not an expert but the diamonds are markings for setting up your bank shots. Bouncing the white ball off one or more rails to hit the intended ball.\nBelieve it or not, there's geometry involved when playing pool and the diamonds mark the spot for the calculations that are done in your head.
913634
place a equilateral triangle on a piece of paper and another identical to the original, with one side and only one  congruent, this will form a diamond shape.  The remaining sides will be represented by drawing lines from each corner of the diamond to the opposite corner. each of these lines will be a edge of the cube, with the intersection of the lines in the middle being the closest corner, and the back 4 sides will be covered by the front lines.
773165
There is an equipment use in jewellries store,..to check wether a diamond is genuine or not.If the jewelry is diamond,..this equipment will make a beeping noise/alarm.\n\nIf u can borrow..one of this equipment,..it will be faster.
100197
A website called Primestyle had great, inexpensive, high quality diamond jewlery.  Primestyle will design jewlery for you as well.  If you are looking for pricier peices, look at Blue Nile or Modera.
405248
The standard way of testing if something is diamond is to do the scratch test.  Because diamond is so hard only diamond will scratch diamond.  There are more technical methods to determine phase, e.g. X-ray diffraction, Spectroscopy techniques etc. but I guess that they are not available to you.
261378
Take it to a jeweler.