how to differentiate between diamond and synthetic diamond?
447815
with synthetic diamonds you can feel a little better about yourself for not supporting the corrupt system that directs their being mined.  and nobody is really lying about how "scarce" synthetic diamonds are.
1085201
Total internal reflection. A diamond has a high index of refraction - about 2.418 - one of the highest among natural gemstones. Air, by contrast, has an index of refraction about 1. When a light ray enters one of the surfaces or facets of a diamond at any angle except directly perpendicular ("normal") to the surface, it is refracted (bent) toward the perpendicular (normal) to the surface.  The light ray continues to travel inside the diamond until it reaches another edge.\n\nHere is where it gets interesting.  If the angle that the light ray makes with that surface is large enough, the light ray cannot refract - bend enough - to exit the diamond. Instead, it is "totally internally reflected" and that light passes through the diamond to another edge (facet).  There, if the diamond is properly cut, it will exit the diamond, giving the diamond a sparkle as many rays of light entering from other directions are also totally internally reflected. \n\nOver the years, gem cutters have learned the proper angles that will maximize the total internal reflection - that is, trap as much light from as many different directions as possible and cause it to exit the diamond through other facets.
213121
Diamonds are supposed to be pure 100% carbon, but due to some impurities they are classified by their shades. \nThe shades are named as: Blue white, First Cape, Second Cape, First bye, Second bye, Off color, Light yellow , Yellow \n\n\nAlso according to their shapes when they are taken from the mine, they are classified in: \n1. Close goods \n2. Spotted stones \n3. Rejection cleavage \n4. Fine cleavage \n5. Light brown cleavage \n6. Ordinary and rejection cleavage \n7. Flats \n8. Naats \n9. Rubbish \n10. Boart\n\nFinallly each colour is sub divided according to the sizes:\nFinest extra blue white, Fine Capes \nExtra blue white, Capes \nFinest blue white, Byewaters \nBlue white, Yellows \nFinest white, Finest light brown \nWhite, Light brown \nSilver Capes, Brown and dark brown \n\nAll these colors are divided into shipments of Closed Goods, Spotteds, Irregulars, Blocks, Naats, and Flats.
235295
Don't know if there is a rule of thumb but I'd say it would have to depend on how deep the diamond is so it wouldn't be simple math (area of a circle).  If the diamond is shallow, the face of it will look wide but it won't be as brilliant - the cut is important.  What you may want to do for comparison's sake is go on an internet site selling diamonds (loose ones) pick a couple 0.5 ct sizes in the shape you want (round = solitaire) and look at the dimensions... then pick a couple 1.0 ct sizes and check out its dimensions - that will show you the relative sizes to each other.\n\nAlso, with earrings - is it total carat weight or each earring?  If you have 1.0 tcw, each earring will be 0.5 cts.\n\nTo the guy below me: carats are a measure of weight (as described by the guy above me) - since diamonds are all made of the same stuff (therefore have the same density) the higher the carats, the more weight, the more volume, and the more volume, the bigger the size.  Of course number of carats correspond with size!  Cut is also important and will effect how big something *looks* but a 1.0 carat diamond will always be heavy (and therefore bigger) than a 0.5 ct diamond.
360444
The four C's are used to determine a diamond's rarity and value, according to the Jewelry Information Group, a non-profit trade association based in New York.\n\nCut refers to the shape of the diamond and the number of its facets - or flat, polished surfaces. Each diamond cut should be precise to best show the stone's brilliance. A well-cut diamond reflects the light and refracts it back to your eye.\n\nClarity is determined by a diamond's internal imperfections and external irregularities, which interfere with the passage of light through the stone. Called inclusions, they can be spots, lines or bubbles. The fewer inclusions, the greater the value of the stone.\n\nCarat is a diamond's weight, not size, as many people believe. One carat equals 200 milligrams - the heavier a diamond, the greater its rarity and, usually, value.\n\nColor is also a value-determining factor. Diamonds can come in a variety of colors, but colorless stones are most rare and expensive. Diamonds are graded on a color scale, from D (colorless) to Z, established by the Gemological Institute of America (GIA). The further down the alphabet, the more yellow and less valuable the stone is.
938195
The rating for selection of good diamonds and proper pricing is based on 4 (Four) "Cs" 0- Carat, Clarity,  Color, Cut. The significance of these qualities are-\n\nThe carat weight measures the mass of a diamond. One carat is defined as a fifth of a gram, or exactly 200 milligrams (about 0.007 ounce). The point unit—equal to one one-hundredth of a carat (0.01 carat, or 2 mg)—is commonly used for diamonds of less than one carat. All else being equal, the value of a diamond increases exponentially in relation to carat weight, since larger diamonds are both rarer and more desirable for use as gemstones. A review of comparable diamonds available for purchase in September 2005 demonstrates this effect \n\nClarity is a measure of internal defects of a diamond called inclusions. Inclusions may be crystals of a foreign material or another diamond crystal, or structural imperfections such as tiny cracks that can appear whitish or cloudy. The number, size, color, relative location, orientation, and visibility of inclusions can all affect the relative clarity of a diamond. The Gemological Institute of America (GIA) and others have developed systems to grade clarity, which are generally based on those inclusions which are visible to a trained professional when a diamond is viewed from above, under 10x magnification.\n\nA chemically pure and structurally perfect diamond is perfectly transparent with no hue, or color. However, in reality almost no gem-sized natural diamonds are absolutely perfect. The color of a diamond may be affected by chemical impurities and/or structural defects in the crystal lattice. Depending on the hue and intensity of a diamond's coloration, a diamond's color can either detract from or enhance its value. For example, most white diamonds are discounted in price as more yellow hue is detectable, while intense pink or blue diamonds (such as the Hope Diamond) can be dramatically more valuable.\n\nDiamond cutting is the art and science of creating a gem-quality diamond out of mined rough. The cut of a diamond describes the manner in which a diamond has been shaped and polished from its beginning form as a rough stone to its final gem proportions. The cut of a diamond describes the quality of workmanship and the angles to which a diamond is cut. Often diamond cut is confused with "shape."\n\nBased on all the above quallity and price will be determined-
165956
Look at this site for all your needs of the subject:\n\nhttp://en.wikipedia.org/wiki/Diamond
625721
Here are some questions that will help you:\n\nFirstly, are they natural or synthetic?  \nSome synthetics can look amazingly similar to heat-treated naturals.  \n\nIf they are synthetic, what kind of synthetics are they? Flame-fusion? Flux-grown? Flame-fusion synthetics can be had for a few cents a piece.  Some flux-grown synthetics cost over a $100/ct.\n\nIf they are natural, you'll need to judge their quality:\n\nColor - Is the color saturated? Is the tone balanced? Do they show undesirable brown modifiers? \n\nClarity - Are there inclusions? How distracting are they? Where are they located? Do they improve or adversely effect the aesthetics of the stones?  Do they affect durability? \n \nCut - Are the stones faceted or cabachon-cut? Are they transparent, translucent or opaque?  What shapes are they?\nAre they cut well? ie balanced & symmetrical, good length-width ratio, good polish and finish.  There is a premium for matched pairs and lots.\n\nCarat - 13 rubies totalling 50 carats makes each piece about 3.85cts.  Hmmm...that's considered large for rubies.  \nFine stones above 3 carats are considered rare.  Commercial & utility quality stones can be hundreds of carats in size and still not be very valuable.\n\nOrigin - Where were they mined? There is a premium for Burmese stones, especially from Mogok.\n\n------------------------------------------ \n\nBased on the information you have provided, it is not possible to accurately say what they are worth.  You could have a jeweller look at them, but it's probably better to send them to a professional colored stone appraiser.  \n\nAs a very rough estimate, here are some price ranges for faceted rubies in the 3ct range (in Bangkok): [Commercial/Good/Fine]\nRuby [25-300/300-1000/1000-6000]\nPink Sapphire (low saturation rubies) [50+/100-250/250-1500]\n\nBTW, 99% of all rubies available in the market are heat-treated.  A premium is put on stones that are not heated but only if they are of fine quality material.  All other things equal, washed out stones that have not been heat treated are never worth more than heated material with good color.
666494
first of all do you know anything about diamonds?Do you know how to grade a diamond??Can you tell a real one from a fake??Do you have people or a place to sell your diamonds???There is a lot to know before you put your money or even your trust into a venture you are thinking about.
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Diamond origin can not be determined yet by a lab, so unless you are buying directly from the mine, you can not be sure the diamond is actually from that location.  They are now laser inscribing canadian diamonds to try and tag the diamond so you know it's from there, but they can easily be polished off.  Every step a diamond takes to get to a jewelry store adds more money to the price of the stone, so the closer you buy the stone from when it was mined, the cheaper it will be.
427090
Cubic zirconia is NOT a diamond; it's a different material completely (zirconium oxide) that simply looks like a diamond. A created diamond is pure carbon crushed and heated by a machine. A real diamond is pure carbon crushed and heated by nature.
736771
Diamond is in the Native Elements Group of minerals. In order to test the streak it is required to have a substance harder than the substance requiring the streak, and no naturally occurring substance is harder than diamond. Even if there was a harder mineral, the amount of force needed to powder a diamond is so huge that it would take specialized machinery at do it.
373154
Hello duties on diamonds depend on the diamond themselve. What kind of diamods you are talking about? Raw-diamond...\nDo you like to do it on business or private??\nTherfore the tax is depending.\nSpecify your question.
20159
The chemical compositions and physical properties are identical to the natural sapphires. The tell-tale sign of synthetic sapphires is the crystalline growth lines which are usually curved due to the pulling during the accelerated crystal growth process.\n\nA version which shows an asterism (pic in source)  is called a star sapphire. Although natural sapphires can show an asterism, the shape of the star is usually somewhat irregular and sometimes indistinct. A manufactured star sapphire called the Linde Star shows a very regularly-shaped and distinct asterism because the formation process is more tightly controlled than the natural version.
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!!
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.
576759
synthetic diamonds.\n\n"Diamond, it turns out, is a geek's best friend. Not only is it the hardest substance known, it also has the highest thermal conductivity - tremendous heat can pass through it without causing damage. Today's speedy microprocessors run hot - at upwards of 200 degrees Fahrenheit. In fact, they can't go much faster without failing. Diamond microchips, on the other hand, could handle much higher temperatures, allowing them to run at speeds that would liquefy ordinary silicon. But manufacturers have been loath even to consider using the precious material, because it has never been possible to produce large diamond wafers affordably. With the arrival of Gemesis, the Florida-based company, and Apollo Diamond, in Boston, that is changing. Both startups plan to use the diamond jewelry business to finance their attempt to reshape the semiconducting world."