PRESIDIUM Gem Tester II Instruction Manual

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Language Contents
1. English Language pg. 02
2. Chinese Language pg. 18
3. French Language pg. 33
4. German Language pg. 50
5. Italian Language pg. 67
6. Russian Language pg. 84
7. Spanish Language pg. 102

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I. Disclaimers, Exclusions and
Limitations of Liability pg. 03
II. About this book pg. 04
III. About your Presidium Gem Tester II pg. 05
IV. IMPORTANT NOTICE pg. 07
1. GETTING STARTED with your
Presidium Gem Tester II pg. 08
2. PERFORMING A TEST with your
Presidium Gem Tester II pg. 13
3. READING TEST RESULTS on
your Presidium Gem Tester II pg. 15
4. TAKING CARE of your Presidium
Gem Tester II pg. 17
Contents
(English Version)

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PLEASE READ AND NOTE PRESIDIUM WARRANTY
TERMS AND CONDITIONS as stated in the warranty
card. Presidium warranty for its testers are subject to
proper use by its users in accordance with all the terms
and conditions as stated in the relevant user handbook
and shall cover only manufacturing defects.
Due to continuous product improvement, Presidium
reserves the right to revise all documents including the
right to make changes to the handbook without notice and
without obligation to notify any person of such revisions
or changes. Users are advised to check Presidium’s
website http://www.presidium.com.sg/ from time to time.
Presidium shall not be responsible for any damage or
loss resulting from the use of this tester or handbook, and
under no circumstances shall Presidium, its manufacturer
or any of its subsidiaries, licensors, distributors, resellers,
servants and/or agents be liable for any direct or indirect
damages, resulting from the use of this tester.
TO THE MAXIMUM EXTENT PERMITTED BY
APPLICABLE LAW, under no circumstances shall
Presidium, its manufacturer or any of its subsidiaries,
licensors, distributors, resellers, servants and/or
agents be responsible for any special, incidental,
consequential or indirect damages howsoever caused.
The tester or Presidium Gem Tester II (PGT II) referred
to in this handbook is provided and/or sold on an “as is”
basis. Except as required by applicable law, no warranties
of any kind, either expressed or implied, including, but not
limited to, the implied warranties of merchantability and
tness for a particular purpose.
I. Disclaimers, Exclusions and Limitations of
Liability

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Thank you for purchasing the Presidium Gem Tester II
(“PGT II” or “tester”).
This handbook is designed to help you set up your tester
and describes all you need to know about how to use
your tester accurately and take care of it in line with its
requirements. Please read these instructions
carefully and keep them handy for future reference.
This book also contains the terms and conditions in
relation to the use of the tester including the Disclaimer,
EXCLUSION and Limitation of Liability clauses stated
above in Section I.
II. About this book

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III. About your Presidium Gem Tester II
The Presidium Gem Tester II is based on the invention
of Professor Julian Goldsmid from the University of New
South Wales in Australia. It was developed to distinguish
between diamonds and its other simulants using the
principles of thermal conductivity.
Diamonds, with their exceptional heat conductivity
properties are unlike any other simulants, and are
therefore not easily replicable.
The Presidium Gem Tester II probe consists of two linked
thermometers: one, which is heated electronically, while
the other is cooled by the gemstone being tested. The
di󰀨erence in temperature creates an electrical output,
which is then amplied and displayed on an analog dial.
The Presidium Gem Tester II is now equipped with
a Color Stone Estimator display to assist the user in
distinguishing popular colored gemstones from each other.
It is to be noted that natural and synthetic gemstones
have similar physical and optical properties. As such,
Presidium Gem Tester II does not distinguish between
natural and synthetic gemstones.
As with all thermal testers in the market, the tester is
not able to di󰀨erentiate between natural Diamonds and
Moissanite.
The Presidium Gem Tester II has been subjected to
thorough factory quality control, and will
generally give a clear and reliable reading of the
gemstone being tested under proper use. However,
you are advised to conduct further supporting tests.

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The Presidium Gem Tester II features the following:
• Retractable thermoelectric probe tip that ensures
constant pressure between probe tip and gemstone
• Industry’s thinnest probe tip (0.6mm) for testing
diamonds as small as 0.02ct
• Metal alert buzzer to ensure that probe tip is in contact
with gemstone during testing
• Clear and easy-to-read analog dial
• No waiting time between tests
• Built-in Calibration (CAL) and Glass test discs
for reference
• Powered by 2 x AA batteries or adaptor
Included in your package:
• Presidium Gem Tester II
• Probe pen
• Built-in Calibration (CAL) and Glass test discs
• AC adaptor
• User handbook
• Warranty card
• Protective carrying case
1 Thermal Conductivity Calibration Inlet With Plug
2 Adaptor
3 Probe Protective Cap
4 Probe Pen
5Glass Test Disc
6 Calibration (CAL) Test Disc
7 ON/OFF LED Indicator
8 ON/OFF Switch
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1
8
7
3
2
4

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IV. IMPORTANT NOTICE
• Keep the tester dry. Precipitation and all types of
liquids or moisture can contain minerals that will
corrode electronic circuits. If your tester does get wet,
remove the battery, and allow the tester to dry
completely before replacing it.
• Do not use, store or expose the tester in dusty and
dirty areas. Its moving parts and electronic
components can be damaged.
• Do not use, store or expose the tester in hot areas.
High temperatures can damage or shorten the life of
the tester, damage batteries, and warp or melt certain
plastics.
• Do not use, store or expose the tester in cold areas.
When the tester returns to its normal temperature,
moisture can form inside the device and damage
electronic circuit boards.
• Do not attempt to open the tester other than as
instructed in this handbook.
• Do not drop, knock, or shake the tester. Rough
handling can break internal circuit boards and ne
mechanics.
• Do not use harsh chemicals, cleaning solvents, or
strong detergents to clean the tester.
• Do not paint the tester. Paint can clog the moving parts
and prevent proper operation.
If the tester is not working properly, kindly contact our
Customer Service at [email protected] or
Presidium Instruments Pte Ltd
Unit 7, 207 Henderson Road
Singapore 159550
Attn: Customer Service Executive

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Powering up your Presidium Gem Tester II
This tester can be powered by either the use of an AC
adaptor or through the use of batteries. If AC adaptor is
used, connect one end of the AC adaptor to the tester
and the other end directly into an electrical outlet. Please
ensure that only the adaptor supplied by Presidium is
used.
If batteries are used (2 x AA batteries), take note of the
positive (+) and negative (-) directions of batteries when
inserting the batteries into the tester (Fig 1.1). The use
of alkaline batteries is preferred, as it should generally
give approximately two and a half hours of continuous
operation, while the use of ordinary batteries will give a
shorter working life.
Fig. 1.1
Turning on your Presidium Gem Tester II
Insert the probe pen into the socket at the back side of the
tester (Fig 1.2). Note that the probe pen must be inserted
into the socket before turning on the unit. Otherwise,
the indicator will rise to the Dark Grey zone (Diamond/
Moissanite) when turned on.
1. GETTING STARTED with your Presidium Gem
Tester II

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Fig. 1.2
Switch the tester to the ON position, wait for
approximately 20 seconds for the initial warm-up
period (Fig. 1.3). At this point, it is quite common if the
reading slightly above zero is indicated on the meter.
Fig. 1.3
Testing to ensure your Presidium Gem Tester II is
functioning properly
Calibration (CAL) test disc
• Press the probe tip onto the calibration (CAL) test
disc located on the right of the indicator lamp (Fig.1.4).
Apply su󰀩cient pressure to retract the protruding tip
completely into the probe pen. The indicator should
rise to and remain within the red strip (preferably at
the center of red strip) with “CAL” printed on top,
within two to three seconds.

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Glass test disc
• Press the probe tip onto the glass test disc located
on the left of the indicator lamp (Fig. 1.5). Apply
su󰀩cient pressure to retract the protruding tip
completely into the probe pen. The indicator should
rise to and remain within the red strip (preferably at
the center of red strip) with “Glass” printed on top,
within two to three seconds.
Fig. 1.4
Calibration
All testers have been calibrated during the manufacturing
process and no further adjustment or user intervention to
the tester is required.
Self-calibration should not be attempted. To minimize any
risks associated, users should contact Presidium at
[email protected] or its service center for
assistance. In the event that users require the
manufacturer to re-calibrate the unit, the users will bear
the associated to/fro freight cost for the shipping of unit to
the service center.
Fig. 1.5

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Recommended testing conditions
The gemstone should be clean and dry before testing.
However, elaborate cleaning procedures are not normally
necessary (Fig. 1.6).
The recommended testing temperature is 18°C – 27°C or
65°F- 80°F Please allow the gemstone or jewelry piece
to adjust to room temperature prior to testing.
Exposure and/or operation of the tester outside the room
temperature would a󰀨ect the results and performance of
the tester.
Battery information
Do not leave worn out batteries in the battery
compartment as the batteries may corrode, leak, and
damage the tester. Batteries should be removed when the
testerisexpectedtobestoredforanextendedperiodoftime.
Batteries do not have to be removed when the AC
adaptor is in use.
To prevent inaccurate readings, replace with fresh battery
if the red LED does not light up after 20 seconds. A test
should not be performed when the battery is low or at.
Fig. 1.6

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Cleaning your gemstone prior to testing
Prepare a clean tissue. Carefully retrieve the gemstone
with tweezers and place the gemstone face down on the
table (Fig. 1.7).
Gently rub the table of gemstone against the
tissue/jewellery cloth and place the gemstone on the
centre of the Test Pad (Fig. 1.8).
Fig. 1.8
Fig. 1.7

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Place the tip of the probe pen against the gemstone.
Apply minimal pressure to fully depress the tip into the
probe pen for correct reading. This is to provide a steady
and constant contact made between the probe tip and the
gemstone.
For mounted jewelry or gemstones:
Hold the jewelry or gemstone with one hand and the
tester with the other hand (Fig. 2.1). Care should be
taken when testing mounted jewelry. User must ensure
that the stones are securely mounted before conducting
a test as gap between stone and setting might lead to
inaccurate reading.
Fig. 2.1
2. PERFORMING A TEST with your Presidium Gem
Tester II
For testing loose gemstones:
Place the gemstone on the metal stone rest and hold the
metal stone rest with one hand while holding the probe
with the other hand (Fig. 2.2).
Note: Metal stone rest is not provided by Presidium.
Fig. 2.2

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Tips for using your Presidium Gem Tester II
If the tester is being used for the rst time, or if the tester
has not been used for a week, it is advisable to clean the
probe tip using a piece of paper to attain consistent and
accurate reading. Rub the tip gently across the paper
surface before testing.
The probe tip must be placed at a right angle or
perpendicular to the facet of gemstone for an accurate
reading.
Tests should be conducted on the table of the gemstone.
In the event of any doubt, kindly test on the girdle of the
gemstones instead.
To achieve optimum accuracy for tests involving very
small gemstones (10 points and below), it is important
to allow the gemstone to cool down before subsequent
tests.
It is advisable to take multiple readings regarding the test
results indicated.

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The test results are indicated as follows:
• After pressing the probe tip on the stone for about 2
seconds, the indicator will reach its highest position,
then slowly fall back. Take the reading at the highest
position.
• The tester will provide all possible results on the
display.
• The Presidium Gem Tester II should be used only to
conrm the identity of suspected gemstone.
• An example of reading the result on the meter is given
below:
3. READING TEST RESULTS on your Presidium
Gem Tester II
When the indicator stops at the above position, the stone
tested may be Quartz, Amethyst, Citrine, Tanzanite or
Aqua, i.e., any stones that fall within the black strip that
the indicator passes.
Metal Alert Buzzer: If the tip of the pen comes in contact
with the metal mounting of a stone, an audible signal is
emitted.
• LIGHT GREY band: Simulant is detected if the needle
falls into this band
• DARK GREY band: Diamond/Moissanite is detected if
the needle falls into this band.
Relatively low readings in the dark grey zone must be
expected with very small diamonds.
Based on the thermal test results, Presidium Gem Tester
II can easily distinguish between:

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Sapphire vs. Tanzanite Jadeite vs. Chrysoprase
Sapphire vs. Iolite Ruby vs. Spinel
Sapphire vs. Spinel Ruby vs. Garnet
Sapphire vs. Citrine Topaz vs. Aquamarine
Sapphire vs. Topaz Topaz vs. Amethyst
Sapphire vs. Tourmaline Topaz vs. Citrine
Emerald vs. Jadeite Spinel vs. Garnet
Jadeite vs. Garnet Gem-
stones vs. Glass
The use of the thermal results is restricted to the
gemstones listed above and will assist the jeweler to
distinguish the many confusing gemstones in the market.

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• The probe and wire tip is extremely sensitive and
should be handled with care. Caution should be taken
so as not to damage the probe tip.
• Do not use the tester if the indicator lamp does not
glow or glow as brightly. This is to prevent inaccurate
measurements.
• Do not leave worn out batteries in the battery
compartment as the batteries may corrode, leak or
damage the tester. Batteries should be removed when
the tester is expected to be stored for an extended
period of time.
Your tester is a product of extensive design and
craftsmanship and should be treated with care.
Thank you for taking time to go through the user
handbook which will enable you to understand your
recent purchase better.
Presidium also recommends that you register your
warranty by sending the warranty registration card to us
or registering online at http://www.presidium.com.sg/
4. TAKING CARE of your Presidium Gem Tester II

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Presidium Gem Tester II
(PGT II) 用户手册

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I. 关于本手册 pg.20
II. 关于 Presidium Gem Tester II pg.21
III. 重要说明 pg.23
1. 开始使用 Presidium Gem Tester II pg.24
2. 在 Presidium Gem Tester II
上执行检测 pg.28
3. 在 Presidium Gem Tester II
上读取检测结果 pg.30
4. 维护 Presidium Gem Tester II pg.32
目录
(Chinese Version)