Site Contents

Roundtable Gemmolgy Discussions are held on a regular basis.
They are open to anyone and are ALWAYS free of charge.
Click HERE for specifics on an upcoming topic.

Click HERE to go directly to the chat room.

New Chat's with Brian, Tim and Frank in .pdf format.
Chick here to install Adobe Reader, if you don't have it already installed!

NewPhysics Chat: Light Wave or Particle

Gemology with Tim Spauwen FGA

Cause of Color in Gems

Cause of Color in Gems 2
Cause of Color in Gems 3
Cause of Color in Gems 4
Cause of Color in Gems 5
Garnet 1
Garnet 2 Grossular & Andradite
Tourmaline Chat

The Beryls
Inclusions I

Physics with Brian

Hydrogen Energies
Hydrogen Energies 2
Hydrogen Energies 3
Hydrogen Spectroscopy
Hydrogen States
Ruby Fluorescence or
"How to turn a ruby into an
emerald, spectrally speaking

Microscopy I - Lenses
Microscopy II, Lenses Again
Microscopy Lenses III
Microscopy: Gathering Light
Numerical Appertures

Diffusion 1
Diffusion 2
Magnetism 1
Magnetism 2
Magnetism 3

Gemology with Frank Rafferty FGA

Color in Gems: Transition Metals
Color In Gems: Charge Transfer


Index of Past Gemmology Chats
Hosted by Alain vanAcker:

Click on the links for the full text of previous chats!

Celebrity Chats

Cos Altobelli
Tom Chatham
Tom Chatham on Teminology: Created vs. Synthetic Richard Drucker & Stuart Robertson Richard Hughes Vincent Pardieu 1
Vincent Pardieu 2
Jolyon Ralph Robert Weldon Colin Winter Richard W. Wise

General Gemmology Chats
(Roundtable tutorials on topics of gemmological importance)
Famous Diamonds Geology as it Relates to Gemmology:Building Blocks of Gems Chemical Composition of Gems
Hardness & Specific Gravity
Specific Gravity 2. Specific Gravity 3 Nature of Light
Timezones: Coordinating Chat-Times
Study Tips for Gemmology Form& Habit Form & Habit, continued Guest Guru: Ars: Gemstone Cutting & More Optics Polarization Polarization 2 Polarization 3 Guest Guru: Classy Carat: Visual Optics Visual Gemmology, continued Colour in Gemstones Pleochroism Absorption Spectra Luminescence Practical Gemmology Corundum Corundum 2 Corundum 3 Beryl & Related topics Beryl & Related topics 2 Beryl & Related topics 3 Beryl 4 :The End Isomorphous Replacement in Garnet Isomorphous Replacement in Garnet 2 Ugrandite Garnets Quartz evolving into Fraunhofer lines Enantiomorphism, pyro- and piezoelectricity Tourmaline Group Tourmaline, continued (The Kerez Effect) Zircon Chrysoberyl, Alexandrite and Cymophane Basics of Atoms, Isotopes & Shells Intervalence Charge Transfers
Critical Angles and Total Internal Reflection
Gem-A Final Review Tutoring Session 1 Causes of colour - crystal field theory
Causes of Color:charge transfer
Causes of Color:band gap theory
Colour grading in coloured stones
Clarity grading in coloured stones
Practical use of the retardation plate