1. Can Gemlogis thermal testers detect uncut raw/uncut stone?

Yes, as long as the stone has a clean & flat surface.

2. Will the size of the gemstone affect the test result?

Smaller stones conduct less heat from the probe tip. Hence, the reading indicated will be slightly lower. However, it is still within the reading zone.

3. Why do I get inconsistent readings from my tester?

Inconsistency in readings could be a result of variation in the environment such as the temperature and/or applied pressure of the probe tip.

3.1 Gems / jewelry pieces should be tested at room temperature.

3.2 For stones below 0.5 cts, always allow time for the stone to cool down before subsequent testing.

3.3 The probe tip must be held perpendicularly (90o) to a flat surface on the stone.

Consistent pressure must also be applied (the tip must be fully retracted into the probe).

3.4 Clean the tip occasionally as dirt will directly lead to inconsistent test results.

3.5 Dirt on surface, inadequate polishing and uneven surface of a stone will affect the reading.

4. 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.

5. 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.

6. Why do I sometimes hear intermittent beeping when testing gemstones?

AZURE/CIEL has a built-in metal detector. Whenever the probe tip touches a metal surface, an intermittent beep will sound. This is only applicable to mounted gemstones.  

7. Can the PISTACHIO identify the exact stone?

PISTACHIO only provides the heat conductivity reference of various stones. Prior to testing, the user must be aware of which specific type of gemstone they are handling, then as a reassurance, use PISTACHIO to confirm its identity.

8. Can the PISTACHIO identify synthetic and natural stones?

Due to the same formation of chemical composition of synthetic and natural colored gems, the thermal inertia of synthetic stones has the same heat conductivity as natural gemstones. The PISTACHIO can hardly distinguish between synthetic and natural gems by testing its thermal inertia only.

9. How do I read/interpret the test results on the meter display of PISTACHIO?

Please refer to the picture below. All readings (indicated by the black needle) that fall within the thin blue bars are possible gemstones. Please note that the readings will fluctuate.

The diagram below indicates the possibilities of the gemstone being Jadeite, Spinel, Chrysoberyl, Quartz, Amethyst or Citrine.

Gemlogis Pistachio referential meter

10. What do the numbers on the dial face represent?

They represent the output voltage of the heat conductivity measured in millivolts against time (in seconds) after the probe is brought into contact with different gemstones.

11. Why is the meter indicator not reverting back to zero?

It could be static charge on the surface of the meter. Please wipe the surface of the meter with a damp tissue to discharge the static electricity.

12. Why do I get inconsistent readings for loose stones from PISTACHIO?

When heat conducts from the probe tip to the stone, the meter indicates the amount of heat conductivity of the stone. The reading falls once the heat is saturated. Try placing the stone on the stone rest (provided) to enhance the heat conductivity. Always allow the stone to cool down for a while for subsequent tests.

13. Why does moissanite register as diamond when using the metal tray?

The stone must be placed on the stone rest or held in a tweezer. One hand must be holding the stone rest / tweezer while the other holds the tester.

14. It is difficult to hold stones of smaller diameter during testing. What should I do?

Try placing the stone on the metal stone rest (included with CIEL/AZURE purchase).