Laboratory grown diamonds
synthesized with two technologies:
HPHT and CVD

Laboratory grown diamonds are not only gem quality diamonds

but also a breakthrough technology which will,l.change the world of the future.

Laboratory grown diamonds are the highest achievement of scientific and technological research and, evidence of the technological development of humanity.

Zharkov A.V.

ULTRA C Founder

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.

ULTRA C provides a full
range of services

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.

Learn more

The company additionally offers:

  • Consulting services

  • Professional gemological assessment of characteristics

  • Sorting of laboratory grown diamonds by color

  • Proving training

Laboratory Grown diamonds are identical to natural ones

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

Visit our showroom to learn more about
laboratory grown diamonds and witness
their high quality

Sign up for a free demonstration at your convenience

The lab is located at the address: Kuznetsky squad st. 6/3, Moscow

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The synthesis of diamonds brought about a new age in its history.

The large-scale synthesis is carried out by two main methods:

  • High Pressure, High Temperaturе
  • Chemical Vapor Deposition
  • 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.

    HPHT diamonds

  • 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.

    CVD diamonds

We meet international standards

We assess diamonds according to the 4-c system

  • Mass
  • Color
  • Clarity
  • Cut quality
  • 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)*.

  • Color

    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.

  • Clarity

    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:

    • Internally Flawless (FL, IF)
    • Very very slightly included (VVS1, VVS2)
    • Very slightly included (VS1, VS2)
    • Slightly included (SI1, SI2)
    • Included (I1, I2, I3)
  • Cut

    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:

    • Excellent
    • Very good
    • Good
    • Fair
    • Poor

The table of relations of screen sizes and gem diameter
to the approximate weight and number per carat.

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  • Address:

    Kuznetsky squad st. 6/3, Moscow

  • Phone number:

    +7 (903) 726-60-22‬+7 (903) 726-60-22‬
  • Opening hours:

    Mon-Fri 9 a.m. – 19 p.m.
    Sat-Sun 10 a.m. – 18 p.m.