2026 Advanced Gemstone Inclusions – 2-Day Course
This hands-on two-day course mainly using microscope with polariscope attachment exposes you to Mr John Koivula’s definitions of both typical and atypical inclusions in natural, treated, untreated and synthetic gemstones, honing your diagnostic skills and immersing you deeper into the beauty and wonder of gemstones.
Most of the stones and inclusions have been pre-identified.
This course is divided into two sections:
1. Definitions:
Become more familiar with inclusions in heat-treated rubies and sapphires, learn what is meant by a comet, or bleb, and discover these
and many more definitions whilst viewing gemstones containing them.
2. Gemstones:
Thousands of inclusions are available to view in:
– Garnet, Moonstone, Peridot, Spinel,
– Topaz, Tourmaline, Zircon, Tanzanite,
– Corundum - Rubies & Sapphires
– Beryl - Emeralds
and some Synthetic Gemstones.
A coloured inclusions manual is provided.
6 CDP available to NCJV members.
Most of the stones and inclusions have been pre-identified.
This course is divided into two sections:
1. Definitions:
Become more familiar with inclusions in heat-treated rubies and sapphires, learn what is meant by a comet, or bleb, and discover these
and many more definitions whilst viewing gemstones containing them.
2. Gemstones:
Thousands of inclusions are available to view in:
– Garnet, Moonstone, Peridot, Spinel,
– Topaz, Tourmaline, Zircon, Tanzanite,
– Corundum - Rubies & Sapphires
– Beryl - Emeralds
and some Synthetic Gemstones.
A coloured inclusions manual is provided.
6 CDP available to NCJV members.
Saturday 15 August 2026 - Saturday 19 September 2026 (UTC+10)
Location
Gemmology House
128 Terry Street, ROZELLE NSW 2039
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2026 Advanced Gemstone Inclusions – 2-Day Course
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