but also a breakthrough technology which will,l.change the world of the future.
The field of laboratory grown diamonds covers many aspects of the human’s activity. They improve the quality of life and provide new possibilities of development – from healthcare to creating supercomputers.
Gem quality laboratory grown diamonds are more affordable, come in a variety of colors and are able to inspire jewelers for creating masterpieces.
The main area of work of the ULTRA C company is the production, promotion and selling of colorless and colored laboratory grown diamonds of the highest quality.
The company additionally offers:
in terms of physical, chemical, aesthetic and optical properties.
They have the same firmness, crystalline grid structure and importantly – the same brilliance, shine, brightness, and sparkle.
Video of the brilliance of a natural diamond
Video of the brilliance of a laboratory grown diamond
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The large-scale synthesis is carried out by two main methods:
The method is based on growing the diamond under conditions similar to the formation of the natural diamond in the earth's mantle.
High-pressure cell (HPC) – a container containing graphite being the source of carbon, metals acting as reaction catalysts (as a rule, iron, cobalt, nickel), other elements depending on the required properties of the resulting product – is placed into a hydraulic press ensuring the required pressure.
A substrate is also located in the HPC, on which special diamond plates – seeds are placed. As a result of high pressure at high temperatures the atoms of carbon from dissolved graphite are settled down from the melt of the metals on the diamond seed resulting in the growth in the diamond crystal.
Deposition from the gas phase
Thin diamond substrates-seeds for crystal growth are placed in the reaction chamber on the substrate holder directly in the plasma area formed by the incoming gas mixture (as a rule, methane acting as a source of oxygen and hydrogen ensuring the required reaction kinetics).
The plasma, which is most often excited by a microwave discharge, heats the substrates to a temperature of 600-1200ºС and serves as the source of particles for diamond film deposition. The synthesis process takes place at a diminished pressure: to 0.4 atm.
We assess diamonds according to the 4-c system
Mass (Carat weight)
The diamond mass is measured in carats (1 ct = 0,2 g). When weighing the diamond, special carat scales are used, the obtained mass is rounded up to the second character after the comma.
The diamond mass is rounded upwards if the third character after the comma is 9, in other cases, it’s rounded downward. For small-sized round diamonds, tables of relations of screen sizes or diameter in millimeters to the approximate weight of one gem in carats as well as to the number of gems per carat are often used (see the table)*.
Diamonds are divided by color into groups from D to Z. The colorless range resides within the groups from D to F, then the intensity of the upper color visible from the side of the crown gradually increases.
Colored (fantasy-like, painted) diamonds comprise a special category. These are gems of intense colors of yellow, brown, red, pink, green, blue, dark blue, purple, and other shades.
The assessment of brilliants by color is carried out in comparison to references, each of which is on the upper or lower limit of the color range.
The diamond clarity is assessed using a magnifier of a tenfold increase. The diamond clarity shows how freely the light can penetrate the inside of the gem. There are the following groups by clarity in international practice:
AAccording to many specialists, the quality of the cut is the most significant parameter since it’s the cut that reveals all optical properties of the diamond to the full, namely, clarity, the brilliance of white and colored flashes, when the brilliant “burns”, shines, sparkles.
When determining a group of the cut, such parameters as gem proportion, symmetry and polishing are considered. The more diamond deviations from the perfect cut, the worse its optics. There are 5 groups of the cut according to international standards:
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Round MM Size
Round Carat Weight