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Fracture-filled Diamonds:
Filling fractures in gems is not new; its roots lie in the oiling of emeralds, a practice said to date back to ancient Rome, and even earlier. The The filled areas may appear opaque to X-rays. Gas bubbles trapped in the filling are another feature in some treated stones. Most are quite small but they can be plentiful. When many of them are present, they can produce a "fingerprint-type" inclusion scene. If the filling is thick enough, as in a filled drill hole, it is sometimes possible to see its true color, a light brown to brownish yellow.
Weight does not change measurably as a result of treatment, and the apparent clarity does not always improve, while the apparent color may sometimes get lower. Wholesale ammonite Jewllery
It is important to note that the treatment does not really improve the grade of a diamond. At best, the apparent clarity goes up by one or two grades. On the other hand, the apparent color may drop one grade and sometimes two. It should be remembered that most in-filled diamonds are in the imperfect range, which means that inclusions affect their beauty or durability. Because the in-filling process makes the breaks less visible, the appearance of the diamond may well improve, but the fractures are not "healed". Thus, most of them stay in the imperfect range. Occasionally, a VS2 diamond is treated, and the knot or bearding that sets its clarity, is obscured.
Wholesale druzy Jewellery The most important step in detecting in-filling is to be on one's guard and to suspect any diamond which simply "does not look right," especially under magnification. Binocular magnification and darkfield illumination are essential. Only the 10x power loupe, this cannot be relied upon to detect filled fractures in all cases. In fact, fibre-optic illumination is sometimes required to detect the treatment. It is especially helpful with mounted diamonds too.
Sometimes one will see evidence of in-filling on the surface of the stone, such as a faint line indicating where a fracture breaks the surface, or cloudy, circular marks which are apparently a residual effect of the treatment process which has not been removed.
But the real key to detecting in-filling is to move the stone as you examine it. The most consistently noted characteristic is the flash effect, typically orange or purple against a dark background, changing to blue or green on a light background. To see it, the diamond must be viewed at an angle nearly parallel to the break, moving either the stone or the light source, or both. Wholesale dictoric Jewellery Perhaps the greatest precaution a jeweller must take, is to avoid subjecting in-filled diamonds - to the heat required for even the simplest of jewellery repairs. Even when the stone is protected with firecoat, re-tipping prongs with the diamond in place causes the filling to melt and will leave the fractures visible.
Cutting and polishing can also affect the treatment. Similarly, re-polishing in-filled fashioned stones also causes the filling to sweat out.
Carry out the following examination under magnification: rotate the stone, rock it to and fro, or move the fibre optic light, while watching for diagnostic flash effects. Mounted stones can be the most difficult to deal with. Whether buying or selling, or taking in jewellery from a customer, failure to detect the fact that a diamond has been treated could cost much more than just the value of the diamond.
Therefore, full disclosure at every point in the pipeline is critical to the reputation of the diamond industry.