Sapphire
vs. Tanzanite
Jadeite
vs. Chrysoprase
Sapphire
vs. Iolite
Jadeite
vs.
Aventurine
Quartz
Sapphire
vs. Spinel
Ruby
vs. Spinel
Sapphire
vs. Citrine
Ruby
vs. Garnet
Sapphire
vs. Topaz
Topaz
vs. Aquamarine
Sapphire
vs. Tourmaline Topaz
vs. Amethyst
Emerald
vs. Jadeite
Topaz
vs. Citrine
Emerald
vs. Garnet
Spinel
vs. Garnet
Jadeite
vs. Garnet
Gemstones
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.
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 light grey zone.
• Synthetic Spinel: Needle goes about halfway into
the light grey zone.
• High Zircon: Needle goes 2/3 into the light grey zone.
• GGG: Needle goes 1/3 into the light grey zone.
*7-simulant gemstones set is sold separately as an
optional item.
