How to Get the Perfect Imperfect Finish With CVD Rough Diamonds
Unlike naturally occurring diamonds, CVD rough diamonds are created on a large industrial scale. The American Diamond Foundry, which pioneered this technique, is a pioneer in the use of this technique. In January 2019, the company reported a total CVD rough supply of 2.5 million carats, a significant increase from the previous year. Although the method is not yet widely adopted, it is growing in popularity.
Diamonds of brilliant cut, I/VS2, weighing 9.04 carats
A diamond with a clarity grade of VS2 is still considered to be an eye-clean diamond. Its bright brilliance and fire are due to its brilliant cut. Although diamonds with VS2 clarity are often eye-clean, that doesn’t mean that a diamond with this grade is necessarily flawless. Imperfections are often hidden better in diamonds with higher carat weights, and the cut quality of the stone can make up for the absence of inclusions.
A JSM397 ring features a 3.72ct cushion-cut center stone surrounded by 94 round colorless VS diamonds weighing 0.86ct. Its total weight is 4.77ct. A JSM118 pendant is adorned with a 7.17ct cushion-cut center diamond and two colorless VS round diamonds totaling 0.70ct each.
A diamond with a VS2 clarity grade is very small and almost undetectable with the naked eye. It has many small inclusions but none are large enough to be noticeable. This grade is reflected in the price of the diamond and its clarity grade. A diamond with this grade is usually very high quality and nearly flawless, although its inclusions are sometimes large and aren’t visible to the naked eye.
This 4.06ct fancy yellow radiant cut diamond, certified by the GIA, is set in an 18k yellow gold bezel. Besides, 148 colorless VS2 round diamonds weigh 1.72ct in the setting. The total weight of the stones in this platinum pendant is 6.31ct. After setting, it will appear to be a perfect match for the ring.
This ring has a 2.14ct GIA Certified F VVS1 Radiant cut diamond, surrounded by 2 colorless trapezoid diamonds. These diamonds are set on a platinum gallery. A total of 9.04ct of diamonds make this ring quite a stunning choice. A gorgeous, simple setting and simple style complete this ring.
A JSM017 diamond ring has a 6.09ct fancy yellow VVS1 center diamond surrounded by 171 colorless VS round diamonds. The ring’s total weight is 8.31ct. A JSM078 ring has a 7.17ct fancy yellow VVS1 center diamond with a diamond halo and encrusted shank.
cvd rough diamonds are a perfect imperfect finish
CVD rough diamonds have the same internal structure, chemical makeup, and physical beauty as natural diamonds. They also exhibit the same properties as natural diamonds, including a high hardness of ten on the Mohs scale, intense sparkle, and brilliance. A CVD diamond is the same in appearance as a natural diamond, but with a slightly different finish. It is possible to purchase a flawless CVD diamond, but they are rare.
The process of CVD rough diamond growth involves several stages, including selecting the substrate, feeding different gases into the chamber, and energising them. Once this is done, the diamond will be professionally cut and polished and certified by an independent lab. It is then traded on the diamond market by diamond dealers. When purchasing a diamond, a jeweller will search the market for the best CVD diamonds and then weigh them against other factors, such as its size, beauty, and price.
ACVD rough diamond has an imperfect finish because they were cut in a diamond mill. The diamond mill uses the diamond’s imperfect finish as a hallmark. The diamond’s imperfect finish is the result of the diamond’s imperfections, and the process also helps it to stand out in a crowded market. Diamonds with imperfect finishes are generally more expensive than those with perfect finish. The process also helps diamond sellers determine how much to charge for diamonds with imperfections.
The clarity of the finished diamond refers to its proportions approaching an ideal finish. Diamonds with a higher clarity grade are more valuable, but this cannot be determined by examining the rough diamond. Therefore, it is important to choose a diamond with high clarity grade, even if it is imperfect in some areas. The color of a diamond is also an important factor in its value. This is because diamonds with high clarity have lower costs.
Color-grade is a way to determine the color quality of a diamond. A skilled diamond craftsman evaluates the quality of color in each diamond and assigns a numerical value. Color-grades are further subdivided into twenty groups, each with ninety-six sub-groups. For each color grade, the spectrum of the diamond is acquired. Once the spectra of the diamond is acquired, the final color grade of the diamond is determined.
American Diamond Foundry is a pioneer in using the CVD method at an industrial scale
The CVD process begins with the placement of a process seed (usually a thin slice of diamond or graphite). The seed is then placed in a high-vacuum chamber. The chamber is evacuated to a level of approximately 20 millitorr. It then receives a mixture of carbon-rich gases (typically hydrogen and oxygen) and energy. The energy is then supplied in the form of heat or ionized plasma.
The CVD method has several advantages over the HPHT process. It doesn’t use high pressures and temperatures, and it can grow diamonds over larger areas by using a larger seed plate. The CVD method also enables finer control of the growth chamber environment, which ultimately affects the properties of the finished diamond. The largest CVD diamond ever polished came from a lab in the United States. It was 3.23 carats and was graded as I color and VS2 clarity.
CVD diamonds are a form of man-made gems. The CVD process begins with a tiny diamond seed placed in a carbon chamber. The carbon is heated to a temperature of about 1,500 degrees Celsius, and the carbon melts to form a diamond around the seed. The diamond then cools to form a pure carbon diamond. Alternatively, the CVD method starts with a slice of the diamond seed. This is then filled with hydrogen and oxygen atoms, which are ionised into a plasma.
Identifying a CVD diamond from a natural diamond
When comparing diamonds, you might be surprised to learn that CVDs aren’t actually made from natural diamonds. Natural diamonds are formed deep underground over billions of years. CVD diamonds are a synthetic alternative, created in a lab over a short period of time using a process known as Chemical Vapour Deposition (CVD). Even though the two diamonds have different appearances, they share the same atomic structure and have the same fire and brilliance of a natural diamond.
Fortunately, there are ways to tell a CVD diamond from a natural one. The GIA and IGI certify CVD diamonds by laser-imprinting a unique code on the stone’s girdle. When viewed under magnification, this code corresponds to a paper certificate detailing the stone’s details. The certificate confirms the diamond’s grade and ensures that the stone is genuine.
Although the chemical composition of CVD diamonds is the same, their process of creation differs. A trained gemologist can perform a test to identify the diamond’s origin. The IGI and GIA certifications are the only way for a typical consumer to tell the difference between a natural diamond and a CVD diamond. A diamond that is naturally mined will look as good as one that has been treated with a chemical substance, such as chloride.
Another important factor to look for is the color of a diamond. In addition to its transparency, a diamond’s color grade is affected by internal defects and stress lines. However, one reliable criterion for identifying a CVD diamond from a natural diamond is grainy birefringence patterns. Natural diamonds exhibit low interference color and less apparent abnormal birefringence. CVD synthetic diamonds exhibit higher-order interference color.
While a CVD diamond is less likely to display distinguishable characteristics, its hazy appearance may be a telling sign that it is synthetic. Another tell-tale sign of CVD origin is heavy parallel graining, which gives the diamond a hazy appearance. HPHT-treated natural diamonds look similar to synthetic diamonds and are often sold at a higher price. So identifying a CVD diamond from a natural diamond is important to avoid misinterpretation of the natural stone.
CVD Rough Diamonds How to Get the Perfect Imperfect Finish With CVD Rough Diamonds