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Natural / Synthetic Diamond Screeners & Machines



Synthetic Diamond Segregator

For Testing

  • Natural Diamond, CVD, HPHT, Type IIa

  • Moissanite, Simulants

  • Loose + Mounted (Open or Close back)

gem-product vistapro 1.jpg


Synthetic Diamond Segregator

For Testing

  • Natural Diamond, CVD, HPHT, Type IIa

  • Loose + Mounted (Open or Close back)

gem-product vista 1.jpg


Synthetic Diamond Segregator

For Testing

  • Natural Diamond, CVD, HPHT, Type IIa

  • Loose + Mounted (Open or Close back)

The fast-growing need for diamond screening machines

The diamond industry as a whole is now at a phase where synthetic and treated diamonds are close to indistinguishable from earth-mined diamonds. Without the help of diamond screening machines, such diamonds are likely mixed amongst earth-mined diamonds and sold to customers unknowingly.


Although customers can send the stone for lab verification, such action is expensive and excessive in comparison to the value of the stone. To overcome the issue, the industry introduced diamond screeners to assist in the verification process.


The process of diamond screening involves various tools called “Natural Diamond Screeners” or “Synthetic Diamond Screeners”. These tools range from desktop to handheld size and are either for quickly verifying a small amount of stone, while others specialize in accurately checking one stone at a time.


Gemlogis introduced its first handheld diamond screeners in 2014. It was considered one of the most compact natural diamond screeners at the time and paved the way for other models. These diamond screening machines use Short Wave Ultraviolet (SWUV) to segregate colorless stones into different group types:

Group A
– Earth Mined:

  • Type IaA and IaAB diamonds absorb SWUV light.

  • Users will be able to identify natural diamonds with a natural diamond screener.

Group B
– IaB, IIa, IIb including lab-grown HPHT / CVD:

  • Type IIa and IIb diamonds does not absorb, it reflects SWUV light.

  • Users will require further lab testing outside of a synthetic diamond screener to determine the exact type of stone.

Reliable & accurate diamond screeners

Gemlogis diamond screeners are both very reliable and accurate, making diamond screening more convenient for the industry. Check out our range of quality diamond screening machines chosen by users across the world.


1. BELIZE - The best natural diamond screener:

Most synthetic diamond screeners in the market require separate verification to ensure that the gemstone is a diamond, not a diamond simulant or Moissanite. It complicates the diamond screening process because the user would need two different pieces of equipment.


Given such, Gemlogis introduces the BELIZE, an instrument combining a Thermal Probe and an Optical Probe in a single diamond screener, allowing users to identify whether the gemstone is a simulant, Moissanite, and earth-mined or synthetic diamond.


Moreover, the BELIZE natural diamond screener can check stones set onto any piece of jewelry with either closed or open-back settings, including but not limited to rings, pendants, earrings, bracelets, and necklaces.


2.VISTA PRO - The most accurate diamond screening machine:

Natural diamond is one of the most precious gemstones in the world, while lab-grown diamond has almost the same physical and chemical structures and properties as natural diamond, making the diamond screening process with bare eyes become more difficult. However, there is significant price difference between a natural diamond and a lab-grown diamond. This is the main reason that we need a professional and reliable diamond screener.      


Gemlogis is the leading brand that has developed the most trusted diamond screening machines for the industry since a decade ago. One of the flagship synthetic diamond screeners by Gemlogis, VISTA PRO, is a compact, convenient diamond screener to differentiate natural diamonds from lab-grown diamonds.


VISTA PRO can perform diamond screening on all kinds of loose diamonds (D-J color) and stones with different type of mounting, from .02 ct to 12 ct. This diamond screening machine has a big capacity that allows users to screen bulky bracelets and necklaces as well. The patented technology and ground-breaking features of VISTA PRO simplify the diamond screening process with a single touch. The result will be shown with a clear LED indicator without letting users analyse complex data or information.


3.VISTA - The most portable synthetic diamond screener:

Diamond screening is no easy task if the device is heavy and hard to operate. In view of this, Gemlogis has developed the most portable and light carry diamond screening machine, VISTA, for gemologists and jewelers.


VISTA is the lighter version of VISTA PRO diamond screener that has the same brilliant features to identify between earth-mined diamonds, Type IIa/HPHT/CVD diamonds instantly. The synthetic diamond screener weighs only 300g, allowing users to carry and use it anywhere.


VISTA is the most advanced and trusted diamond screener which has obtained “ASSURE tested & certified”. It is also equipped with a long-lasting rechargeable lithium battery, enabling users to screen for 5 hours non-stop. VISTA is capable to do the diamond screening with loose stones and all types of mounted jewelry, such as ring, pendant or earrings. 

Why is diamond screening process important?

Earth-mined and lab-grown diamonds are two primary categories of diamonds available on the market today. First, we have to understand their differences.


Earth-mined diamond is a natural gemstone which is formed underground for millions of years, and it is valued for its rarity, durability and beauty. For lab-grown diamond, though they have almost the same physical and chemical properties as natural diamond, it is man-made and is produced inside laboratories.


There are significant price gaps between natural diamonds and lab-grown diamonds, and they are hard to be identified with untrained or naked eyes. That’s why a professional diamond screener is needed for diamond screening.

More about synthetic & natural diamond screeners – FAQs:
  • Why I am getting inconsistent results?
    Gemlogis testers require a certain level of user experience to handle properly: Make sure to clean the probe tip and remove oxidation Make sure to clean the surface of the gemstone to remove any grease and dirt Make sure the gemstones are at room temperature (remove from body/pocket to let it cool down) Make sure to point the probe tip at a perpendicular angle against a flat surface of the gemstone Make sure to allow the gemstone to cool down between consecutive tests Make sure to test different spots on the surface of the stones, due to the impurities on the stones, it may affect the results.
  • Why does moissanite indicate as diamond on some occasions?
    In some instances there may be a disproportional allocation of silicon carbide located on a moissanite; therefore, performing several tests on different spots (including the girdle) of the gemstone is recommended.
  • Can Gemlogis thermal testers detect uncut raw/uncut stone?
    Yes, as long as the stone has a clean & flat surface.
  • Will the size of the gemstone affect the test result?
    Yes. Smaller stones conduct less heat from the probe tip. Hence, the reading indicated may be slightly lower.
  • Why do blue diamond & black diamond indicate as moissanite or metal?
    Blue Diamond is a semiconductor due to the substitution of boron impurities in place of carbon atoms. Black Diamond is substituted with graphite or iron inclusions. Both blue and black diamond will indicate as moissanite or metal on the tester.
  • Why do I sometimes hear intermittent beeping when testing gemstones?
    Whenever the probe tip touches a metal surface, an intermittent beep will sound. This is only applicable to mounted gemstones.
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