Q&A

Here you’ll find our collection of Questions & Answers. This page is continuously updated with answers to your reflections.

What is GemPen?

GemPen is a portable, battery powered, screening device for gemstones specially designed for the working gemmologist. The technology utilizes specialized UV filtering providing users with the means to efficiently and swiftly indicate whether a diamond is natural, synthetic (man-made) or treated (improved).

How does it work?

After GemPen is turned on and directed towards a gemstone a fluorescing effect will occur. By analyzing this effect, certain conclusions can be deducted. GemPen gives instant indicative results. GemPen utilizes unique combinations of UV-wave lengths and filtering provoking variable fluorescences in gemstones. With this so called USOF (Ultra Spectrum Optical Filtering) technology, GemPen showcases unique effects, providing results on treatments and synthetics normally not visible with other UV-light products. The combination of calibrated lighting and filtering distinguishes GemPen from other UV-light devices – with consistent results and broader use cases. GemPen comes with four different filters used on differing occasions based on gemstone and manipulation type. For optimal results, all four filters should be used, in particular to indicate treatments.

GemPen Capabilities

TIME SAVER:

  • Screens hundreds of gems in a matter of minutes in the GemPen Travel Case
  • Gems don’t have to be handled individually
  • Visible to the eye and not locked up in a compartment when performing a screening.

PORTABLE:

  • Screen gemstones in the field
  • Battery powered and chargeable
  • Reduces risks and enables safer decisions while trading gemstones in the field.

SIZE INDEPENDENT:

  • Gems of all sizes can be screened
  • Works great for melee.

VERSATILE:

  • Rough, polished and mounted
  • Synthetic gemstones and most known treatments.

INNOVATIVE:

  • Filters for GemPen will be developed for new types of synthetics and treatments
  • Filters for GemPen will be developed for other gemstones
  • GemPen Academy is continuously updated.

DESIGN:

  • Exclusive design
  • Designed and assembled in Sweden
  • Custom built UV light source

What is the difference between GemPen and other UV-light testers available on the market?

Other UV-screeners only use standardized UV light (LW/SW and longwave) whereas GemPen uses a specific light source in combination with several other filters that are tagged to specific gemstones; both synthetic and treated. This is clearly demonstrated in the GemPen Diamond Map. As an example GemPen can detect most CVD’s. Other UV-screeners require the gemstones to be inserted one by one in a locked compartment whereas GemPen can screen a large amount of stones in a matter of seconds. GemPen works on rough, polished and mounted gemstones.

What is GemPen validating that a normal portable LW/SW light source doesn’t validate?

GemPen utilizes USOF (Ultra Spectrum Optical Filtering) technology, which gives consistent gemstone indication that is beyond the normal capabilities of the average UV lights that you can buy. GemPen is not merely a UV light, but utilizes a filtered, full spectrum technology which showcases unique fluorescence effects in gemstones, distinguishing it from traditional UV-screening devices.

Can GemPen distinguish between natural gemstones and all synthetics on the market?

We have achieved positive validations on all existing synthetic diamonds, both CVD and HPHT.

Can GemPen identify other treatments such as?

• Glass fillings: Yes • Oiling or fracture fillings: Yes, (depending on how much oil or filling the stones have been subjected to)

Is GemPen giving indicative or conclusive results?

The results are indicative. GemPen is a screening tool that helps with the validation of the identity of gemstones. It is up to the professional gemmologist to interpret the results. You can consult the following information: • GemPen Test Tree • GemPen Fluorescence Colour Map • GemPen Diamond Map

Can GemPen identify different types of synthetic diamonds?

We have achieved positive validations on all synthetic diamonds, both CVDs (Chemical Vaporised Diamonds) and HPHTs (High-pressure-high-temperature both BELT and BARS).

How long does one battery charge last?

Estimate continuous user-time of approximately 1 hour and it will take 4-5 hours to fully charge using a standard USB-C charger.

What is the difference between GemPen and diamond testers?

Diamond testers only determines whether it is a diamond or a simulant? GemPen will give an indication if it is synthetic or treated diamond. When using GemPen, it is important to know the identity of the stone before testing. GemPen doesn’t substitute diamond testers but complements them.

What is the difference between GemPen and combi-testers?

Combi-testers only determines whether it is a diamond or a simulant (including moissanite). GemPen will give an indication if it is a natural untreated, synthetic or treated diamond. When using GemPen, it is important to know the identity of the stone before testing. GemPen doesn’t substitute diamond testers but complements them.

What is the difference between GemPen and synthetic diamond testers?

GemPen works on both CVD and HPHT diamonds in all sizes. GemPen works on rough, polished and mounted stones and can also indicate different treatments such as HPHT-treatment on CVD and natural diamonds.

Do you still require laboratory testing?

GemPen is an excellent screening device to get a quick indicative result. If in doubt, further testing is recommended.

Does GemPen work on HPHT diamonds that are treated with irradiation?

GemPen works on the type of irradiation treatment that has typically been used in order to change the colour of diamonds.

Does GemPen use fluorescence or phosphorescence?

Both. In particular when observing a weak to moderate bluish fluorescence in natural diamonds, synthetics or treated natural diamonds will emit an obvious greenish fluorescence with a clear continuing phosphorescence.

Does GemPen work on HPHT diamonds that are treated with irradiation?

Yes. GemPen works on the type of irradiation treatment that has typically been used in order to change the colour of diamonds.

Should I use other tools together with GemPen when testing gemstones?

Yes, GemPen is a complementary tool. It is necessary to conduct prior tests to ascertain the type of gemstone that is screened. We recommend using a loupe and/or a diamond/combi-tester.

What is the difference between GemPen and instruments like the Presidium Diamondmate?

The Diamondmate tests thermal conductivity. The reason it can detect diamonds is because diamonds have five times higher thermal conductivity than lab-created moissanite. The Diamondmate however cannot differentiate between natural and lab-created diamonds because they both have the same thermal conductivity. GemPen is used to differentiate natural untreated gemstones from treated and lab-created gemstones.

Why should I buy GemPen?

TIME SAVER:

  • Screens hundreds of gems in a matter of minutes in the GemPen Travel Case
  • Gems don’t have to be handled individually
  • Visible to the eye and not locked up in a compartment when performing a screening.

PORTABLE:

  • Screen gemstones in the field
  • Battery powered and chargeable
  • Reduces risks and enables safer decisions while trading gemstones in the field.

SIZE INDEPENDENT:

  • Gems of all sizes can be screened
  • Works great for melee.

VERSATILE:

  • Rough, polished and mounted
  • Synthetic gemstones and most known treatments.

INNOVATIVE:

  • Filters for GemPen will be developed for new types of synthetics and treatments
  • Filters for GemPen will be developed for other gemstones
  • GemPen Academy is continuously updated.

DESIGN:

  • Exclusive design
  • Designed and assembled in Sweden
  • Custom built UV light source

Does GemPen work on HPHT diamonds that are treated with irradiation?

Yes. GemPen works on the type of irradiation treatment that has typically been used in order to change the colour of diamonds.