how do you physically differentiate real and fake white gold?
87628
Gold is not naturally white so I would assume it is false unless coming from a very reputable jeweler.
305755
Why not take a page from Archimedes' Eureka! moment?\n\nMeasure the density, then ask a jeweler.
326449
With cheaper knock-offs, it is simple to tell as the second hand on a "real" rolex will sweep smoothly, rather than "ticking" from second to second.  This is not the only way to tell, though, as many knock-off's have sweeping hands.  Look at the backing; many fakes have clear backings to see the mechanisms working; real rolex watches never have clear backings.  Also, true rolex watches have no markings on the case backing; most knock-offs have engravings of the rolex logo, or other hallmarks to make you think it is real.  The rare exceptions to this are ladies' models (prior to the mid 1990's) which had "Original Rolex Design" or a similar variation thereof, engraved on the caseback in an arc fashion. Another exception is on the Sea-Dweller case backs which will have "ROLEX OYSTER ORIGINAL GAS ESCAPE VALVE" engraved around the outside of the caseback in an arc fashion.  Genuine Rolex models are shipped new from the factory with a Hologram-encoded (3-dimensional) sticker on the caseback. This sticker features the trademarked Rolex "crown" positioned above the watch's case reference number. The hologram can be easily identified by viewing it from different angles, thus causing the background pattern to change.  However, "most" counterfeit stickers are not holograms at all, but rather simply a repetitious "Rolex" pattern which does not change in appearance when viewed from different angles. It is worth mentioning that the genuine Rolex hologram stickers did not feature the "crown logo" as a part of the hologram until (around) 2002, when the sticker was redesigned. At that time, the Reference number was also changed from gold lettering to black, as it is currently.   For authentic Rolexes, the crystal (on all current date models--excluding the Sea-Dweller) will have a glass bubble, or "cyclops" attached to the crystal, positioned over the date. Its purpose is to magnify the tiny aperture and does so at 2.5 times magnification.  However, on MOST counterfiet models the date magnification is more like 1.5 times, at best. This may not sound like much of a difference, but when looking at the dates side-by-side it's obvious. The date window should practically "fill up" the cyclops--the fakes don't even come close. It is worth mentioning that some counterfeits are now featuring a new larger font date wheel to give the "illusion" of being magnified at a full 2.5 times.   Rolex models featuring the Triplock crown (i.e. Submariner, Sea-Dweller and Daytona) utilize an extra seal within the threads of the winding crown's tube. This gasket resembles a black o-ring and can be visible when the winding crown is unscrewed fully. As shown in the example above, (most) counterfeit models will not feature this o-ring seal, but rather will have basic screw-down threads. It is worth mentioning that some new counterfeits will feature a "similar" looking rubber seal, but upon closer examination you will see that it is merely cosmetic, and is not functional.  Genuine Rolex Yacht-Master models feature a "minute" hand which is considerably thicker than those on other Rolex sports models. However, to save money, counterfeiters will often use the same hands found on the Submariner. Genuine Rolex Daytona models feature mini-registers on the dial which perform Chronograph "stop watch" functions (i.e. elapsed hours and minutes). It is also worth mentioning that the large "sweep" hand on the dial is also part of the stop watch function, and is not the primary second hand-- the second hand for the watch is the small 20/40/60 register.  However, counterfeit models will rarely perform these functions, but rather will be used for "day of week", "date", and "24-hour time". (Please Note: not all counterfeit models will be "printed" with these incorrect fun
186117
Very hard to say without more of a description, but the first thing that camr to mind is a tortoise beetle. Some look clear and I've found some that look like they are made of pure shiny gold.\nA picture at the link below.
610534
They don't issue 24K gold, as it is too soft.\n\nIt can be 24K plated, but you should be able to twist it with ease.
442093
yellow gold and white gold are the same in the allergy department.  \nstart looking at platinum, but beware that platinum dulls very quickly and i'm not sure if jewelers can get it to shine again.\n\ngosh....i feel for you.  ask jewelers if there are any treatments for the gold that would put a barrier between your skin and the metal...maybe some kind of coating??
1121611
First off...look for any stampings on the jewellery, these numbers and or letters will determine karat or silver.  If there is no stamp the piece is likely plated or gold filled.  Precious metals (except silver) will not fade or tarnish.  By your explanation....it sounds like your jewellery is plated.  If you see another metal under the surface it is plated.  If the metal is discolouring but you see no under laying metal, it is likely gold filled.  Platinum is an extremely dense metal (heavy), malleable and presents a grey/white tone.  There are other colors of gold besides white and yelow,  if you see green or rose color these peices are likey gold.
237484
take it to an authentic retail store and have them inspect it.
132834
"White gold is an alloy of gold and some white metals such as silver and palladium. White gold can be 18ct, 14ct, 9ct or any karat. For example, 18ct yellow gold is made by mixing 75% gold (750 parts per thousand) with 25% (250 parts per thousand) other metals such as copper and zinc. 18ct white gold is made by mixing 75% gold with 25% other metals such as silver and palladium. So the amount of gold is the same but the alloy is different.\n\nTraditionally nickel was used in white gold, however, nickel is no longer used in most white gold made today as nickel can cause reactions with some people. We do not use nickel in our white gold\n\nWhen white gold rings are new they are coated with another white metal called Rhodium. Rhodium is a metal very similar to platinum and Rhodium shares many of the properties of platinum including its white color.\n\nThe rhodium plating is used to make the white gold look more white. The natural color of white gold is actually a light grey color. The Rhodium is very white and very hard, but it does wear away eventually. To keep a white gold ring looking its best it should be re-rhodium plated approximately each 12 to 18 months. Most local jewelers are able to rhodium plate jewelry for a cost effective price."
1000065
How would one know if this 'cream' were indeed real, since no one could see it?
567188
Wow it is scary reading some of these answers... Take it to a reputable jeweler in your town and they will test it using  a touchstone and several different types of nitric acid to test. If this is done wrong you could ruin your piece of jewelry.... fire is certainly not your answer... gold meltsssssssssssss..most jewelers and I mean jewelers can tell just by looking, though sometimes even they need to test a piece...
389575
GOLD-PLATINUM-PALLADIUM TEST\nBy Delos Toole\n\nSelect ore samples suspected to contain Gold-Platinum-Palladium and use concentrates equal to the size of one navy bean or pea. Place the concentrates in a clean test tube and add 1cc Nitric Acid and 3cc Hydrochloric Acid, (this a solution named Aqua Regia which is used regularly when testing.) Boil this over a lamp flame for about 5 to 8 minutes. Should this Aqua Regia solution contain Gold-Platinum-Palladium then the following tests will react with various colors, (good idea to practice on known samples of Gold-Platinum-Palladium for color and reaction identification and become familiar to them.)\n\nTest for Gold (Au).\n\nPrepare a solution for Stannous Chloride for each 8 hour period as this solution does not hold up under extended time periods. Dissolving Metallic Tin (Sn) in Hydrochloric Acid (HC1), where the resulted solution will be called Stannous Chloride (SnC1). Place about 2cc of HC1 in a clean test tube and add 1 or 2 small bit pieces of Metallic Tin to the test tube and bring this to a slight boil. You now have Stannous Chloride (SnC1).\n\nNow begin the gold test by making a spot test with freshly made Stannous Chloride by placing a piece of filter paper onto a clean piece of glass and place one drop of Aqua Regia solution in the center of the filter paper, and then add to this mixture one drop of freshly made Stannous Chloride solution. If gold is present there will show up on the filter paper a purple or rose colored spot when the filter paper has dried; the darker the color the more gold will be present; for low grade ore the spot color will appear plainer. Should the filter paper dry out completely, then add 1 more drop of Stannous Chloride solution to the filter paper to bring out the color.\n\nBegin the test for Platinum (Pt) by placing 20 drops of Aqua Regia solution onto a clean porcelain evaporating dish and boil this over a lamp flame until it is dry, then allow this to remain over the lamp flame for about an extended one second.\n\nPlace the dish where it can cool for a few minutes so as not to break the dish. After cooling, place 4cc of distilled water, (or water free from Chlorine), and reheat just to the boiling point. Filter this solution onto another clean porcelain evaporating dish. Add to this dish, Potassium Iodide equal to one grain of rice. Warm this solution slightly over the lamp flame and observe the color that appears. The results for this test will show if Platinum (Pt) is present as the solution will begin to turn to a light or dark rose color within a few minutes time.\n\nThe more Platinum present in the solution, (ore sample), the quicker and darker the color will appear.\n\nSulphides and other impurities, most likely will give a red color to the solution and will be mistaken for the rose color, if so, then boil off about one-half of the solution to quicken the evaporation process. Then let the porcelain dish set until completely dry, then add a few drops of clean plain water, (no chlorine water). The result will then be a bright rose color, and should there be Sulphides or other impurities in the solution they will appear as colorless. If this solution should appear red, then add a few cc’s of plain water to dilute the dark rose color to a lighter rose color, then you have Platinum (Pt).\n\nTesting for Palladium(Pd).\n\nIn the test for Platinum (Pt), upon adding Potassium Iodide (KI) and warming the procedure, if Palladium (Pd) is present in the sample ore, the solution will turn a dark color or black, which depends upon the amount of Palladium (Pd) present. The more Palladium (Pd) present, the darker the color will be, and also there will be a black precipitate in the bottom of the porcelain dish, which when adding an excess of Potassium Iodide (KI) will dissolve giving a wine-red color appearance.
870189
take 1 coin from stack 1\n2 coins from stack 2\n3 coins from stack 3\netc.\n\nweigh the coins.\n\nthey will weigh a little less than 110 ounces\nthe number of ounces less than 110 ounces\nis the counterfeit stack
336935
White gold refers to an alloy of gold and other white metals such as silver, palladium, or nickel. The natural colour of white gold is light gray, so jewelry made of white gold is typically coated in highly reflective rhodium (sometimes coated in platinum and palladium), adding a more brilliant shine. Palladium and silver alloys are of higher quality than nickel and are sometimes not coated with rhodium. The purpose of plating is to add luster to grayer jewelry, as well as to prevent oxidation of some of the metals found in the alloys. White gold is not platinum, but is used as a cheaper alternative, usually costing one-third as much as platinum
465145
There are several ways:\n\nCheck for the thread that runs through real bills by holding it up to the light.\n\nLook for the ghost images that some denominations have.\n\nLook for the miniature writing along the portraits.\n\nUse a pen designed for checking for counterfeit bills.  The ink turns gold on real money, stays black when on fake.\n\nThere are more ways depending on the denomination and year or printing.  Newer higher denomination bills have varying colors that are difficult (if not impossible) to duplicate on a printer.
347109
you could put it in water and see if it tarnishes quickly?\n\ngold is relatively stable, and doesn't tarnish. you could also try to test it's electrical conductivity if you have an ohm-meter. gold conducts electricity very well. you may need more info to do this though.\n\ngood luck
452626
The answer seems to be to mix the gold with silver and wrap it in aluminum foil, thus eliminating the possibility of contamination.\n\nSee: http://www.gold.org/jewellery/technology/assay/