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Explore the fascinating science of gemstone colour, focusing on charge transfer mechanisms, the role of ions, and how treatments like heat affect gemstone hues. Perfect for gemmology enthusiasts and professionals alike.

key topics

Charge transfer in gemstones

Colour centres and defects

Effects of heat treatment on gemstone colour

Titles

The Science Behind Gemstone Colours: Charge Transfer Explained

Unlocking the Secrets of Sapphire and Diamond Colours

sound bites

"Blue sapphire's colour is a football match of ions."

"Charge transfer mechanisms reveal gemstone secrets."

Chapters

00:00 Introduction to Colour in Gemmology

02:53 Understanding Charge Transfer in Gemstones

05:35 Oxygen to Metal Charge Transfer

08:28 Metal to Metal Charge Transfer: The Sapphire Story

10:58 Organic Molecular Electron Transition

16:22 Colour Centres in Diamonds

22:39 The Science of Synthetic Diamonds

25:27 Understanding Green Diamonds

27:44 The Mystery of Pink Diamonds

30:48 Exploring Colour Centers in Diamonds

35:28 The Future of Gemmology and Podcasting

resources

Gem-A Gemmology Course - https://gem-a.com/education

Instagram - https://instagram.com/facetnationgemmology

Email - mailto:facetnation@facetnation.co.uk

gemmology, gemstone colour, charge transfer, sapphire, diamond, heat treatment, colour centres, spectroscopy, mineralogy

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Join us as we explore the fascinating world of tourmaline, its formation, varieties, and historical significance, with insights from gemmologists Lucinda and Simon.

Tourmaline's chemical complexity and isomorphous series
Formation of tourmaline in pegmatites and metamorphic rocks
Varieties of tourmaline and their unique features
Historical lore and the myth of pyroelectricity
Testing and identifying tourmaline in gemmology

Simon and Lucinda

Titles
The Hidden World of Tourmaline: From Conquistadors to Colourful Crystals
Unlocking the Secrets of Tourmaline: Varieties, Formation, and Lore

sound bites
"Paraiba tourmalines glow like neon blue."
"Rubellite is the most popular tourmaline."
"Rubellite is a deep, moody red."

Chapters
00:00 Introduction to Facet nation and Personal Updates
04:26 Shout Outs and Community Engagement
08:38 Exploring Tourmaline: A Gemstone Overview
12:59 The Chemistry and Characteristics of Tourmaline
17:28 Historical Significance and Unique Properties of Tourmaline
20:26 The Science Behind Tourmaline
24:17 Formation of Tourmaline
29:24 Varieties of Tourmaline
36:40 Favourite Tourmalines and Their Unique Qualities

Instagram - https://instagram.com/facetnationgemmology

tourmaline, gemstones, gemmology, mineral formation, jewellery, gem varieties, gemstone history, gem testing, gem inclusions

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This episode explores the science behind gemstone colours, focusing on dispersed metal ions, valency states, atomic environments, and their effects on colour and luminescence. Hosted by Lucinda and Simon, it combines scientific insights with personal reflections and industry tips.


Dispersed metal ions and their role in gemstone colour
Valency states of transition metals and their effects
Atomic environment and its influence on gemstone hue
Luminescence and fluorescence in gemstones
Energy transfer and electron excitation in gemology


Energy transfer in electrons
Valency and atomic environment influence on colour
Colour change effect in gemstones


Review the valency states of transition metals in your gemstone collection
Use a spectroscope to observe absorption bands and fluorescence
Experiment with heating and irradiation to alter gemstone colors


The Science of Gemstone Color: Dispersed Metal Ions and Atomic Environments
Unlocking Gem Colors: Valency, Atomic Environment, and Light


"Light as packets of energy excite electrons."
"Atomic arrangement affects gemstone colour."
"Chromium electrons jump, causing fluorescence."


Chapters
00:00 Introduction to Colour in Gemmology
02:50 Philosophical Reflections on Energy and Colour
05:31 Understanding Ions and Their Role in Colour
08:03 The Impact of Valency State on Gemstone Colour
10:47 Atomic Environment and Colour Variations
13:30 The Role of Chromium in Colour Change
16:16 Luminescence and Its Connection to Colour
18:56 Fluorescence and Crystal Defects
21:25 Conclusion and Future Topics

resources

Gem-A (Gemological Association of Great Britain) - https://gem-a.com
Spectroscope and Light Source Information - https://www.gemologyonline.com
Simon and Lucinda's Instagram - https://www.instagram.com/facetnationgemmology/

gemmology, gemstone colour, dispersed metal ions, valency, atomic environment, luminescence, gemstone spectroscopy, Alexandrite, ruby, emerald

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This week we are joined by Ian Dun, president of the Gemological Association of Australia. Discover insights into gemstone grading, Australian gemstones, and the future of gemological research. Of Particular interest is GAA's, world first, Opal Studies Course. Come and listen to find out all you need to know.

key topics
Gemological education and certification in Australia
Australian gemstones: Opal, Sapphire, and more
Advances in gemstone grading and identification

guest name
Ian Dun

Titles
Unlocking the Secrets of Gemmology with Ian Dun
Australian Gemstones: A Deep Dive into Opal and More

sound bites
"Welcome to Facet Nation, a gemmology podcast."
"Opal is misunderstood and polarizing."
"Australian opal is my favourite gemstone."


Chapters
00:00 Introduction to Facet Nation and Ian Dun
01:52 Ian Dun's Gem Story and Career Path
08:49 The Gemological Association of Australia: History and Courses
12:55 Diploma of Diamond Technology and Practical Grading
21:42 The Online Opal Course: Development and Purpose
23:39 The Journey of Opal: From Mine to Market
27:36 Understanding the Opal Course: Structure and Feedback
29:21 The Allure of Opal: Personal Perspectives
34:19 Opal's Renaissance: Trends and Design Innovations
38:19 Research and Future of Opal Studies
40:39 Exploring Other Australian Gemstones
52:32 The Future of Gemmology: Education and Career Paths

Resources
Gemological Association of Australia - https://www.gem.org.au/

Opal Course - https://www.gem.org.au/courses/opal-studies/

CIBJO Opal Guide - https://www.cibjo.org/

keywords
gemmology, gemstones, Australian gemstones, gemstone grading, gemmological education, opal, diamond, jewellery design, opal study, education

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Explore the fascinating world of physical optics in gemstones, focusing on iridescence, thin film interference, and the science behind colour phenomena like labradorescence and opalescence. Perfect for budding gemologists and enthusiasts alike.

key topics
Physical optics in gemstones
Iridescence and wave interference
Thin film interference in gem materials

Unveiling Gemstone Colours: The Science of Iridescence and More
The Hidden Physics of Gemstone Beauty: A Deep Dive


sound bites
"Iridescence is caused by wave interference."
"Labradorescence is due to the chemistry of feldspar."
"Pearlescence results from stacked layers of aragonite."


Chapters
00:00 Introduction to Physical Optics
02:09 Understanding Iridescence
11:00 Exploring Twin Planes and Their Effects
14:11 The Fascination of Labradorescence and Adularescence
20:03 The Nature of Light and Colour
21:06 Exploring Rainbow Moonstone
22:28 The Allure of Pearls
25:06 Understanding Iridescence in Pearls
28:27 The Mystique of Opals
36:52 Reflections on Quality and Value in Gemstones

resources
Facet Nation Podcast - https://youtube.com/@facetnationuk


guest links
Instagram - https://instagram.com/facetnationgemmology
TikTok - https://tiktok.com/@facet.nation.pod
Email - mailto:facetnation@facetnation.co.uk

gemmology, physical optics, iridescence, labradorescence, opalescence, gemstone science, thin film interference, gemstone phenomena

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This episode explores the fascinating world of coral, its history, types, and significance in gemmology. Hosted by Simon and Lucinda, it covers everything from the biological origins of coral to its cultural importance and modern regulations.

sound bites

"Polyps are tiny creatures related to sea anemones."

"Coral structures are like a living family tree."

"Black and gold coral are rare and often bleached."

key topics

Definition of organic materials

History of coral harvesting and trade

Types of coral: precious, soft, fossilised, black and gold

Identification and authenticity of coral in jewelry

Regulations and sustainability in coral trade

Chapters

00:00 Introduction to Coral and Organic Materials

02:53 The Importance of Organic Materials

05:14 Coral Fishing in History

07:57 Understanding Coral Polyps

10:32 The Journey of Coral Harvesting

13:03 Regulations and Sustainability in Coral Harvesting

15:33 Coral as a Jewelry Material

18:03 Types of Coral and Their Significance

21:50 Identifying Coral: Key Features and Characteristics

24:33 Understanding Soft Coral: Misleading Names and Textures

26:42 Fossilised Coral: The Transformation Process

28:20 Exploring Black and Gold Coral: Unique Properties and Origins

32:17 Coral Conservation: The Impact of Overfishing and Regulations

34:44 Closing Thoughts: The Beauty and Importance of Coral

resources

Gemmology by C. D. M. Roberts - https://www.amazon.com/Gemmology-C-D-M-Roberts/dp/XXXXXX

CITES - Convention on International Trade in Endangered Species - https://cites.org/

Coral Museum in Naples, Italy - https://www.coralmuseumnaples.it/

https://instagram.com/facetnationgemmology

guest links

Instagram - https://instagram.com/facetnationgemmology

TikTok - https://tiktok.com/@facet.nation.pod

coral, gemmology, organic materials, jewellery, coral harvesting, coral types, coral regulation, fossilised coral, coral history, coral identification

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In this episode, Lucinda and Simon explore the fascinating world of gemmology instruments, focusing on colour filters like the Chelsea colour filter and pleochroism testing methods. Learn how these tools aid in gemstone identification and enhance gem cutting techniques.

Educational

key topics

Colour filters in gemmology

Chelsea colour filter purpose and use

Pleochroism and its significance in gemstone identification

Testing for pleochroism with London Dichroscope and calcite dichroscope

Importance of light source and gemstone orientation in testing

Natural vs synthetic gemstone identification techniques

key frameworks

Colour absorption principles

Pleochroism and optical anisotropy

Gemstone orientation and cutting strategies

Titles

Mastering Gemstone Identification: The Power of Colour Filters and Pleochroism Tests

Unlocking Gem Secrets: Chelsea Filter and Pleochroism in Gemmology

sound bites

"Record your observation by stating the colour scene."

"Always think about why you're looking at the stone."

"Share your pleochroic observations with others."

Chapters

00:00 Introduction to Colour Filters in Gemmology

01:55 Understanding Pleochroism and Selective Absorption

05:27 Testing for Pleochroism with the London Dichroscope

10:34 Comparing the London Dichroscope and Calcite Dichroscope

15:36 Documenting Pleochroism Observations

17:35 Understanding Gemstone Colours and Pleochroism

20:04 The Chelsea Colour Filter: A Gemstone Testing Tool

26:23 Practical Applications of the Chelsea Colour Filter

28:50 Identifying Gemstones: Colour Responses and Observations

resources

Gem-A - https://www.gem-a.com

Pleochroism in Gemstones (Book) - https://www.amazon.com/pleochroism-gemstones

Instagram - https://www.instagram.com/facetnationgemmology

Email - facetnation@facetnation.co.uk

gemmology, colour filters, Chelsea filter, pleochroism, gemstone identification, gem testing, gem cutting, gemmology tools

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This episode explores the fascinating world of jadeite, covering its geology, colours, treatments, cultural significance, and the latest gemological insights. Hosted by gemmologists Lucinda and Simon, it offers a deep dive into one of the most revered gemstones across cultures.

key topics

Jadeite vs Nephrite

Colours and Varieties of Jadeite

Treatments and Impostors in Jadeite

Cultural Significance of Jade in China and Central America

Geology and Formation of Jadeite

Titles

Jadeite Unveiled: 10 Facts Every Gemologist Should Know

The Hidden World of Jadeite: From Burma to Central America

sound bites

"Imperial Jade is the poster child for jadeite"

"Mining jadeite involves cutting into massive boulders"

"Testing includes SG, hardness, and visual clues"

Chapters

00:00 Introduction to Jadeite

02:54 The Complexity of Jadeite

05:43 Understanding Jadeite's Properties

08:39 The Formation and Sources of Jadeite

11:20 Cultural Significance and Jewellery of Jadeite

14:08 Impostors and Imitations of Jadeite

18:40 Testing and Identifying Jadeite

26:46 Exploring Literature and Its Influence

28:01 Understanding Specific Gravity in Gemmology

29:59 Testing Gem Hardness and Its Implications

31:30 Refractive Index: A Key to Gem Identification

33:28 The Complex World of Jade Treatments

39:14 Cultural Significance of Jade in China

51:31 Jade's Historical Importance in Central America

Resources

Gem-A (Gemological Association of Great Britain) - https://gem-a.com

Real Jade Co. - https://realjade.com

Instagram - https://instagram.com/facetnationgemmology

jadeite, gemmology, gemstones, jade, mineralogy, treatments, cultural significance, Guatemala jade, gem identification

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