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In this episode of Facet Nation, Simon and Lucinda explore the intricacies of gemmology, focusing on the polariscope and its significance in testing gemstones. They discuss the behaviour of light in relation to isotropic and anisotropic materials, the importance of understanding internal stress in gems, and the use of the conoscope for identifying gemstones. The conversation emphasises community engagement and the joy of learning in the field of gemmology.

Titles

The Fascinating World of Gemmology

Understanding Gem Testing Instruments

Sound bites

"We want to see more cats."

"Light needs to be able to get through."

"The bullseye is diagnostic of quartz."

Chapters

00:00 Introduction to Gemmology and Light Testing

02:55 Deep Dive into the Polariscope

05:26 Understanding Polarisation and Light Behaviour

08:01 Isotropic vs. Anisotropic Materials

10:41 Testing Gemstones with the Polariscope

13:05 Vibration Directions in Gemstones

15:49 Birefringence and Optical Axes

18:41 Conclusion and Key Takeaways

23:52 Understanding Polycrystalline Materials

27:19 Exploring Strain and Anomalous Double Refraction

30:39 Identifying Tabby Extinction and Writhing Snakes

34:11 The Role of the Conoscope in Gem Testing

37:26 Interference Figures: The Bullseye and Beyond

39:47 Biaxial Interference Figures and Their Significance

Understanding the importance of the polariscope in gemmology.

Light behaviour is crucial for interpreting gemstone properties.

Isotropic materials remain dark under polarised light.

Anisotropic materials show varying light responses.

Polycrystalline materials allow light through in multiple directions.

Anomalous double refraction indicates internal stress in gemstones.

Conoscopes help identify gemstone types through interference figures.

Interference figures provide diagnostic information about gemstones.

Recognising tabby extinction and writhing snakes in gem testing.

The podcast emphasises community engagement and learning.

gemmology, polariscope, isotropic, anisotropic, gemstones, light behaviour, gem testing, interference figures, conoscope, anomalous double refraction, gemology

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In this live episode of Facet nation, hosts Simon and Lucinda share their experiences at the London Gem and Mineral Show, where they discuss the fascinating gemstone Tanzanite, its properties, discovery, and significance as a birthstone for December. They delve into the science behind Tanzanite's colour, its varieties, and its cultural importance, while also sharing personal anecdotes and insights from their gemmology journey.

The London Gem and Mineral Show was a significant experience for the hosts.

Tanzanite is the birthstone for December, making it a popular gift choice.

Zoisite is the mineral family that Tanzanite belongs to.

Tanzanite's colour is influenced by the presence of vanadium and iron.

The discovery of Tanzanite is attributed to various individuals, leading to some controversy.

Tanzanite requires heat treatment to achieve its vibrant blue colour.

The gemstone is known for its vitreous lustre and unique trichroism.

Tanzanite is relatively soft, making it less suitable for certain types of jewellery.

The largest faceted Tanzanite weighs 703 carats, showcasing its potential size.

Tanzanite is associated with transformation and spirituality in various cultures.

Titles

The Fascinating World of Tanzanite

Tanzanite: A December Birthstone Exploration

Sound bites

"It's our first ever live show!"

"Tanzanite has a vitreous luster."

"Tanzanite is a very rare stone."

Chapters

00:00 Introduction to the Live Show Experience

03:16 Exploring Tanzanite: The Birthstone of December

06:19 Understanding Zoisite and Its Varieties

09:08 The Science Behind Tanzanite's Colour and Properties

12:25 The Discovery and Commercialisation of Tanzanite

15:11 Tanzanite's Unique Characteristics and Uses

18:09 Metaphysical Properties and Cultural Significance of Tanzanite

21:12 Conclusion and Future of Facet nation Podcast

Tanzanite, Gemmology, Birthstone, Zoisite, Live Podcast, Gemstones, Mineral Show, Colour Properties, Discovery, Metaphysical Properties, Gemology, Tiffany, Trichroism

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In this episode of the Facet nation podcast, Simon and Lucinda delve into the intricate world of light and optics as they relate to gemmology. They explore the fundamental properties of light, including reflection and refraction, and discuss how these principles apply to gemstones. The conversation covers the importance of cut in diamonds, the various optical effects seen in gemstones, and the significance of birefringence. The hosts also touch on the practical applications of these concepts in gem testing, providing listeners with a comprehensive understanding of how light interacts with gemstones.


Takeaways

Light is a form of electromagnetic energy that travels at high speeds.
Visible light is a small part of the electromagnetic spectrum, detectable by the human eye.
Brilliance in diamonds is a result of precise cutting and internal reflections.
The cut of a diamond significantly affects its appearance and brilliance.
Total internal reflection is crucial for maximizing light return in gemstones.
Aventurescence is caused by reflective inclusions within a gemstone.
The cat's eye effect requires specific needle-like inclusions to be visible.
Asterism is a star-like effect that requires multiple sets of inclusions.
Understanding birefringence helps in identifying different gemstone types.
The optical properties of gemstones are essential for gem testing and identification.

The Fascinating World of Gemology
Light and Optics: A Gemologist's Guide

Sound bites
"Light is a form of electromagnetic energy."
"Visible light is white."
"Brilliance is what makes diamonds special."


Chapters

00:00 Introduction to Facet nation and Light in Gemmology
03:38 Understanding Light and Its Properties
09:14 Refraction and Its Importance in Gemmology
17:39 Single vs. Double Refraction in Gemstones
23:52 Birefringence and Its Applications in Gem Testing
24:41 Understanding Light and Gemstones
28:24 The Brilliance of Diamonds
31:49 The Importance of Cut in Diamonds
34:22 Exploring Fire and Dispersion in Gemstones
37:05 Optical Effects in Gemstones
46:15 Chatoyancy and Asterism: The Star Effect
49:08 Labradoressence and Other Optical Phenomena

gemology, light, optics, reflection, refraction, birefringence, diamonds, optical effects, gemstones, gem testing, gemmology

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In this episode Lucinda and Simon speak to gem cutting pioneer Arya Akhavan, his trademarked gemstone cuts; the Void Reaver and the Legend of Zelda inspired Rupee cut are some of the most beautiful you'll ever see.

Listen to this fascinating interview full of almost revealed secrets and future excitement. If you love gems, videogames or videogame gems, this is the interview for you.

Arya Akhavan is a pioneer in video game-themed gem cutting.

The gem cutting community is becoming more collaborative and innovative.

Video games have a historical connection to gemstones as valuable items.

Creating video game-inspired gems involves both artistic and technical skills.

The rupee cut is a unique design that poses specific challenges.

Community forums like Shiny Precious Gems foster support and creativity.

Modern gem cutting techniques are evolving rapidly, especially post-COVID.

There is a growing demand for high-end video game-themed jewelry.

Education in gem cutting is becoming more accessible and innovative.

The emotional connection to gemstones influences how they are valued and cherished.

Link:

Kickstarter

https://www.kickstarter.com/projects/canadacrystallabs/the-gemstone-lab-growing-never-before-seen-lab-sapphires

Reddit

https://www.reddit.com/r/Shinypreciousgems/

Titles

Gemology Meets Gaming: The Rupee Cut Revolution

Crafting Gems: Arya Akhavan's Journey

Sound bites

"It's a really fascinating chat."

"Nobody else had published them."

"It's a rescue puppy."

Chapters

00:00 The Emergence of Video Game Jewelry

04:56 Educational Challenges in Gem Cutting

07:36 The Growth of Modern Gem Cutters

10:19 Community Building in Gemology

13:20 The Intersection of Gemstones and Video Games

15:52 Creating the Rupee Cut

18:38 Characteristics of the Rupee Cut

21:40 Materials for Gem Cutting

24:11 Challenges with Certain Gem Materials

25:12 Setting and Wearing Gemstones

26:59 Emotional Connections to Cut Stones

28:27 Innovative Gemstone Designs

29:48 The Evolution of Gem Cutting Techniques

33:09 The Renaissance of Modern Gem Cutting

36:26 Future Innovations in Gemstone Research

43:01 Exploring Corundum and Sapphires

45:18 Community Engagement in Gemology

46:47 The Value of Rupees and Gaming References

gemmology, video game gems, gem cutting, Arya Akhavan, gemstone design, community building, gem education, rupee cut, innovative designs, gem materials, gemology

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In this episode of the Facet Nation: A gemmology podcast, hosts Lucinda and Simon explore the intricate relationship between light and gemstones. They discuss the importance of light in visibility and gem testing, delve into the characteristics of light waves, and examine historical theories of light, including Newton's corpuscular theory and Huygens' wave theory. The conversation also covers the significance of polarised light, the behaviours of light such as reflection, refraction, and diffraction, and the implications of the double slit experiment. The episode concludes with a look ahead to future topics related to light and gemmology.

Titles

Exploring the Nature of Light in Gemmology

The Journey of Light: From Waves to Gems

Sound bites

"What is light?"

"Light is essential for visibility."

"Polarised light reduces glare."

Chapters

00:00 Introduction and Graduation Celebration

03:03 Mnemonic for Mohs Scale

05:48 Understanding Light and Optics

11:28 Characteristics of Waves

16:59 Polarised Light and Its Applications

22:21 Wave Behaviours: Reflection, Refraction, and Diffraction

24:16 History of Light Theory and Newton's Contributions

26:29 Theories of Light: Newton vs. Huygens

30:07 The Double Slit Experiment: Proving Wave Theory

33:57 Einstein and the Birth of Modern Physics

36:10 The Photoelectric Effect: Light as Particles

38:31 Understanding Light: Refraction and Colour

42:09 Reflection, Transmission, and Absorption of Light

43:50 Recap and Future Discussions on Light and Gemmology

Takeaways

Light is essential for visibility and understanding gemstones.

The Mohs scale mnemonic can be improved for better memorization.

Light behaves as both a wave and a particle, known as wave-particle duality.

Polarised light is crucial for reducing glare and enhancing visibility.

Understanding wave characteristics like amplitude and frequency is vital for gemmology.

Reflection, refraction, and diffraction are key behaviours of light waves.

Historical theories of light evolved from Newton's corpuscular theory to wave theories.

The double slit experiment demonstrated light's wave nature through interference patterns.

Light interacts with matter, affecting colour perception and gemstone identification.

Future discussions will delve deeper into light's role in gem testing.

gemmology, light, optics, waves, Mohs scale, polarised light, reflection, refraction, diffraction, history of light, gemology, science

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In this episode of the Facet nation podcast, Simon and Lucinda delve into the intricate world of gemmology, focusing on the concepts of weight, density, and specific gravity. They explore the historical significance of Archimedes' principle, practical methods for hydrostatic weighing, and the use of heavy liquids in gem identification. The hosts engage with their audience, sharing insights and personal anecdotes, while emphasising the importance of these concepts in the gem trade.

Titles

The Weight of Gems: Understanding Density and Gravity

Gemmology 101: Weight, Density, and Specific Gravity

Sound bites

"Weight is crucial in gem pricing."

"The importance of weight in gem pricing."

"Carat weight affects the price per carat."

Chapters

00:00 Introduction and Welcome

02:53 Engagement with Listeners

05:14 Understanding Weight and Density in Gemstones

10:33 The Importance of Carat Weight

14:49 Price Per Carat and Market Dynamics

20:18 Specific Gravity Explained

25:11 Historical Context of Specific Gravity Measurement

27:24 Eureka! The Principle of Displacement

28:39 Hydrostatic Weighing: The Science of Density

33:45 Heavy Liquids: Testing Gemstones at Home

38:17 The Game of Sink, Swim or Suspend

Weight is crucial in gem pricing and identification.

Specific gravity is a key property for gemologists.

Archimedes' principle is foundational in understanding density.

Hydrostatic weighing is a practical method for determining specific gravity.

Heavy liquids can help distinguish between different gemstones.

Amber's specific gravity allows it to float in saltwater solutions.

Carat weight affects the price per carat of gemstones.

Understanding heft can aid in gem identification.

Gemmologists often use digital scales for precise measurements.

Engagement with listeners enhances the podcast experience.

gemmology, weight, density, specific gravity, gemstones, Archimedes, hydrostatic weighing, heavy liquids, carat weight, gem identification, gemology

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In this episode of FacetNation, Lucinda and Simon delve into the essential aspects of gem durability, focusing on hardness, toughness, and stability. They discuss the Mohs scale of hardness, the importance of understanding these properties for both gemologists and jewellery enthusiasts, and practical tips for caring for gemstones. The conversation also covers the differences between fracture and cleavage, the impact of chemical stability on gems, and how to properly maintain and wear jewellery. The episode concludes with listener engagement and a shout-out to dedicated fans.

Takeaways

Understanding durability is crucial for gemmologists and jewellery lovers.

Hardness, toughness, and stability are the three main aspects of durability.

The Mohs scale helps determine a gemstone's hardness.

Toughness refers to a material's ability to resist fracture.

Stability involves a gem's resistance to chemical and physical changes.

Different gemstones have varying levels of durability and care requirements.

Fracture and cleavage are important concepts in gemmology.

Chemical stability can affect the appearance and longevity of gemstones.

Proper care can prevent damage to valuable gems.

Engaging with listeners enhances the podcast experience.

Titles

The Essential Guide to Gem Durability

Understanding Gemstone Hardness and Toughness

Sound bites

""You need to know them stone for stone.""

""Last on and first off for pearls.""

""Don't put your tourmalines in the ultrasonic, y'all.""

Chapters

00:00 Understanding Durability in Gemstones

02:57 The Importance of Hardness

05:33 Mohs Scale of Hardness Explained

08:08 Identifying Gemstones by Hardness

10:44 Toughness and Durability in Gemstones

13:19 The Role of Friedrich Mohs

15:48 Practical Applications of Hardness Testing

20:46 Understanding Hardness and Scratch Testing

24:44 Identifying Composite Materials and Their Characteristics

26:28 Differential Hardness Explained

30:35 The Art of Cleaving Diamonds

34:21 Modern Techniques in Diamond Cutting

35:53 Differential Hardness in Other Gemstones

41:08 The Streak Test: A Practical Approach

45:36 Toughness vs Hardness in Gemstones

46:18 Thermal Expansion and Gemstone Integrity

47:46 The Dark Side of Crackled Quartz

49:09 Understanding Fractures in Gemstones

50:53 Cleavage vs. Fracture: Key Differences

52:50 The Importance of Cleavage in Gem Identification

54:35 Incipient Cleavage: A Hidden Danger

56:21 Stability: The Third Pillar of Durability

01:01:11 Chemical Vulnerabilities of Gemstones

01:04:29 Porosity and Its Impact on Stability

01:06:24 Final Thoughts on Gem Durability

gemmology, durability, hardness, toughness, stability, Mohs scale, gemstones, jewellery care, fracture, cleavage, gemology

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In this episode of Facet Nation, Lucinda and Simon explore the spooky side of gemstones, discussing Halloween traditions, recent robberies in the gem industry, and the history of cursed stones. They delve into tales of the Black Orlov diamond, the Bahia Emerald, The Black Prince's Ruby, and the infamous Hope Diamond, revealing the dark stories and misfortunes associated with these gems.

Takeaways

Halloween is a significant cultural event in America.

The UK is slowly adopting American traditions like Halloween.

Recent robberies in the gem industry highlight security issues.

The Louvre robbery was a simple yet bold heist.

Cursed gemstones have fascinating histories and folklore.

The Black Orlov diamond is linked to multiple tragic deaths.

The Bahia emerald has a history of misfortune for its owners.

The Black Prince's ruby is associated with the downfall of monarchs.

The Hope diamond has a legacy of tragedy and misfortune.

Curses often stem from the act of stealing sacred objects.

Titles

Cursed Gems: The Dark Side of Beauty

Halloween and the Haunting of Gemstones

Sound Bites

"Simon was the ringleader."

"It's a bit weird."

"The no hope diamond."

Chapters

00:00 Halloween and Its Cultural Significance

02:56 Recent Robberies in the Gem Trade

05:42 The Louvre Robbery: A Closer Look

08:24 Hatton Garden Heist: A Shocking Incident

11:05 The Emotional Weight of Jewellery

13:18 Cursed Gemstones: An Introduction

15:45 The Black Orlov: A Cursed Diamond

20:30 The Curse of the Black Orlov Diamond

24:27 The Bahia Emerald: A Tale of Misfortune

30:04 The Black Prince's Ruby: A Royal Curse

38:31 The Legacy of Cursed Gems

38:53 Historical Figures and Their Legacies

41:03 The Curse of the Hope Diamond

54:18 Cursed Gems and Their Stories

Keywords

Halloween, gemstones, robberies, cursed stones, folklore, jewellery, history, spooky stories, gemmology, folklore, jewelry, gemology, diamond