PRESIDIUM Duo Tester PDT II Mode D'emploi page 20

Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Emerald
Emerald
Jadeite
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.
Reading optical test results
• A Reflectivity Number is displayed. Note the Reflectivity
Number and compare it with the reflectivity chart
attached in the package.
• In case of a borderline reading, clean the stone and
pad again before the next test and/or move stone
slightly off center. By repositioning the stone, a
distorted reflection from a scratched area of the surface
may be avoided. Repeat the test.
• Synthetic Spinel/Synthetic Sapphire and High
Zircon/GGG have overlapping Reflectivity
Numbers. If in doubt, use thermal conductivity
measurement for easy separation.
• Synthetic Sapphire: needle goes to a high position
in the red zone.
• Synthetic Spinel: Needle goes about halfway into
the red zone.
• High Zircon: Needle goes 2/3 into the red zone.
• GGG: Needle goes 1/3 into the red zone
*7-simulant gemstones set is sold separately as an
optional item.
vs. Tanzanite
vs. Iolite
vs. Spinel
vs. Citrine
vs. Topaz
vs. Tourmaline Topaz
vs. Jadeite
vs. Garnet
vs. Garnet
Jadeite
Jadeite
Ruby
Ruby
Topaz
Topaz
Spinel
Gemstones
vs. Chrysoprase
Aventurine
vs.
Quartz
vs. Spinel
vs. Garnet
vs. Aquamarine
vs. Amethyst
vs. Citrine
vs. Garnet
vs. Glass
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