18. The Best Kept Secrets of Spinel
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18. The Best Kept Secrets of Spinel
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Summary
In this episode, Lucinda and Simon explore the fascinating world of spinel, a gemstone often overshadowed by rubies and sapphires. They discuss its chemical composition, colour variations, and historical significance, as well as the modern rise of synthetic spinel. The conversation delves into the properties that make spinel a desirable choice for jewellery, its unique inclusions, and the testing methods used to identify it. The hosts also highlight famous spinels throughout history, emphasising the gemstone's newfound recognition and value in the gemological community.
Takeaways
Spinel is often confused with rubies and sapphires due to its similar appearance.
The chemical composition of spinel is magnesium aluminum oxide.
Spinel comes in a variety of colors, including red, blue, and black.
Spinel is a durable gemstone, making it suitable for everyday wear.
Historically, spinel was often misidentified as ruby, leading to its nickname 'balast ruby.'
The Mahenge region of Tanzania produces some of the most valuable spinels.
Spinel crystals can form in octahedral shapes, similar to diamonds.
Synthetic spinel is produced using the Van Gogh flame fusion method.
Testing spinel involves using a refractometer to determine its refractive index.
Famous spinels include the Black Prince's Ruby and the Timer Ruby.
Chapters
00:00 New Year, New Beginnings
02:07 The Allure of Spinel
03:47 Understanding Spinel's Composition
07:59 The Color Spectrum of Spinel
10:55 Spinel Crystals and Their Formation
14:08 Historical Significance and Modern Sources
17:59 Inclusions and Unique Features of Spinel
18:58 Identifying Spinel vs. Other Stones
24:06 Synthetic Spinel: The Modern Challenge
30:11 Introduction to Spinels and Spectroscopy
34:03 Understanding Spinel Spectra
35:40 Famous Spinels: The Black Prince's Ruby
38:06 The Historical Significance of Spinels
41:29 The Sumerian Spinel: Myths and Legends
44:32 The Cote de Bretagne Spinel: A Unique Jewel
47:10 The Modern Recognition of Spinels