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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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