Everything you wanted to ask about it, but there wasn't anybody to...

First of all, I want to tell you two of the most important things about treated diamonds.

1. Treated diamonds' values are significantly lower than the similar untreated stones. According to the rules of CIBJO and US Federal Trade Commission laws, the seller must disclose all kinds of diamond treatments at the moment of sale. And now we will proceed to the most important thing.

2. Most kinds of enhanced diamonds do not remain stable for an extended period. There are six technics for color and clarity enhancement, but in my opinion, only two of them deserve your engagement ring. We will help you understand what kind of treated diamonds are recommended for purchase and what kind of treatments are better to avoid to prevent possible disappointment.

So, let's begin. Treating the diamonds has a specific purpose - to improve the visual appearance and the beauty of the diamond by improving two parameters: Color and Clarity. Accordingly, all diamond treatments are divided into two groups: Color Enhancement and Clarity Enhancement.

Color Enhancement
HPHT
The best-treated diamond you can purchase is Color Enhanced diamond by HPHT (High Pressure High Temperature) technology.HPHT technic converts rare Type IIa diamonds (only less than 1% of all diamonds contain no nitrogen) – from brownish colored to colorless. How does it work? High Pressure High Temperature press is the kind of "oven," like the one in your kitchen. The only difference is that it may weigh like the battle tank (up to 60 tons). It heats the chamber to 1800ºC and keeps the pressure of 60000 atmospheres. Similar to the kitchen, imagine undercook potatoes. What is the problem with it? It may look good but not eatable. How can you fix it? To boil it until it's fully cooked.
Precisely the same, we can perform to rare brownish Type IIa stones that were slight "undercook" by nature? Small plastic deformations cause brown tints appearance in the diamonds in the atomic lattice of the diamond. High Pressure and High Temperature repair and fix natural plastic deformations and convert brownstone to colorless, blue, or pink. The Type IaB and Type IIb diamonds can get Yellow and Blue colors and tints. Now please, pay attention; the treatment is eternal and undetectable even under very high magnification. The only way to detect HPHT treatment is by the use of very sophisticated laboratory equipment. Don't hesitate to buy an HPHT color-enhanced diamond. Among treated stones, it gives the best value for its money.
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Don't hesitate to buy an HPHT color-enhanced diamond. Among treated diamonds, it gives the best value for its money.
Irradiation treatment
The next color enhancement treatment is recommended if you are looking for affordable Fancy Color diamonds. We are talking about Bombardment (Irradiation) treatment. Natural colored diamonds are rare. Not everyone can afford a one-carat Natural Fancy Vivid Blue diamond, which costs about $1,500,000. Here comes natural diamond with artificially enhanced color, which allows you to purchase beautiful Fancy Color diamond for an affordable price. The bombardment is the only treatment process that exists in nature as well as in the lab. All of the natural diamonds were exposed to natural radiation millions of years ago to be considered "irradiated" stones. With modern technologies, gemological laboratories find it difficult to differentiate the origin of green diamonds if the color is natural or artificial. The nature of such stone until today is undetermined. The process of artificially changing colors by irradiation was developed in 1904 by British chemist Sir William Crookes. Since that time, irradiation technics has made significant progress. During the last decades, modern technology has improved the technics—like unstable color and uneven dispersion- many problems of the past. The transparency now is not so affected as once. Today, irradiation of the diamonds by electron rays with Van de Graaff generator allows us to get solid colors, homogenous, durable, not fading Fancy Colored diamonds for affordable prices.
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So, if you want to propose her beautiful Fancy Yellow, Pink, Blue, Green, or Red diamond, Bombardier or Irradiated stone is the best option for you.

Now, let's talk about treatments that are not recommended for purchase.

Diamond Coating
Painting the diamonds with colors is the oldest technics. Semi-transparent blue or black coating substances on the pavilion (the bottom facets of the stone) help neutralize the diamond's yellow tints. It may improve the color in 3 to 4 grades up. For example, it may "upgrade" the color of the diamond from "N" color to "J." Red semi-transparent paint on the pavilion makes low color diamonds appear attractive Fancy Pink hues. The yellow paint on the pavilion makes the same stone look like beautiful Fancy Yellow. Regularly, coated diamonds are set inside the jewelry with a "bezel" or "channel" setting when only the crown (upper, uncoated part) of the stone remains open. The coated (painted) part is "hidden" inside the metal. It helps prolongate the "life" period of the diamond coating. Otherwise, the coated surface is easily damaged by the kitchen "chemistry," easily scratched, or removed by acetylene. Over time, the coating layer starts to peel and fade away due to extended exposure to the sun's UV rays. This kind of color treatment is not recommended for purchase.
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This kind of color treatment is not recommended for purchase.
Clarity Enhancement
Laser Drilling
The first type of clarity enhancement is Laser Drilling. The high-power laser beam can burn the tiny channel from dark and noticeable internal inclusion inside the diamond toward the surface. Open access to inclusion lets the strong acids reach it through the burned channel inside the stone while procedure, called the "deep boiling." As a result, bleached dark inclusion disappears or changes its color to white, making it less noticeable. The fat, dirt, and mineral salts in liquid condition might penetrate the drilled channel in the length of time, making it more prominent and requiring additional boiling to clean it.
The fat, dirt, and mineral salts in liquid condition might penetrate the drilled channel in the length of time, making it more noticeable and requiring additional boiling to clean it.
Internal Laser Drilling
KM or Internal Laser Drilling. KM means "special drilling" in Hebrew, "Kiduah Miuhad." If you want to ask: why is it necessary to invent another kind of laser drilling? Is conventional laser drilling not enough to eliminate inclusion? The answer is simple. Laser Drilling does good work, but it's easily detectable because of the drilled channel. Even regular jewelers can detect laser drilling by the look from the side. Instead of it, KM works differently, and sometimes it's isn't easy to identify this kind of treatment. Let's see how it works. The unfocused laser beam heats the dark inclusion inside the diamond.
The process of inclusion's heating inside the diamond creates internal pressure. This process is similar to the function inside another kitchen appliance – the pressure cooker, with a small but significant difference. There is no steam vent to release the pressure from inside the stone. So, the pressure finds itself the way out, breaking and splitting the diamond and creating the artificial fracture. The next step after the treating is deep boiling of the stone in strong acids to dissolve the inclusion and burned carbon residues inside the fracture.
In some cases, after the treatment, only the professional gemologist can detect this kind of clarity enhancement. If the artificial fracture is not too wide, the dirt from outside will not penetrate the stone. Generally, the treatment is not bad, but it is mostly applied to shallow clarity diamonds. So even after the treatment, the diamond remains non-attractive.
Generally, the treatment is not bad, but it is mostly applied to low clarity diamonds. So even after the treatment, the diamond remains non-attractive.
Fracture Filling
The third and most popular method of clarity enhancement is Fracture Filling. The diamond's fracture stops the ray of light, traveling through the stone like a barrier. The crack became light, and as a result, it is visually noticeable. How to make it "disappear" or less visible, at least? One of the diamantaires discovered that fractures could be easily filled with glass. We also call it silicone or silicate, but they are just different names for the same material. Filling with high refractive index glass makes fracture appear much less visible. Diamonds look much cleaner. This procedure can turn the unsellable I2 clarity diamond into desirable SI1. Under normal conditions, fracture filling is stable for some time. But it is easily damaged under the heat, pressure, or acids environment of kitchen chemical cleaners, degreasers, removers, and descalers. The regular procedure of cleaning the jewelry set with a fracture-filled diamond using standard jeweler's devices and methods is not recommended. Ultrasonic, steamer, or cleaning liquids will damage the filling. Over time, due to extended exposure to the sun's ultraviolet rays, the transparency of the filer inside the fractures deteriorates. It may dry out and appear milky or dirty. In this case, the filler should be removed and refilled with a new one. It is up to every person to choose or not to choose a clarity-enhanced diamond for her ring. I am personally would not advise you to purchase clarity-enhanced diamonds. If you wish to buy a good stone and save some money, I recommend looking for color-enhanced HPHT-treated stone, Bombardier, or laboratory-grown diamonds.
Over time, due to extended exposure to the sun's ultraviolet rays, the transparency of the filer inside the fractures deteriorates; it may dry out and appear milky or dirty. In this case, the filler should be removed and refilled with a new one.
In Conclusion

It is up to every person to choose or to avoid clarity-enhanced diamond for her ring. I am personally would not advise you to purchase clarity-enhanced diamonds. If you wish to buy a good stone and save some money, I recommend looking for color-enhanced HPHT-treated stone, Bombardier, or laboratory-grown diamonds.

So, I hope these small secrets will help you make the right choice.
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