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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