Hardness, toughness, and stability answer different questions. A gem can resist scratches yet still chip, cleave, or react to heat or chemicals, so everyday wear needs a whole-piece review.

A three-part durability framework for comparing scratch resistance, resistance to chipping, and stability under heat, light, chemicals, and humidity in a finished piece.

What this guide covers

Separate scratch hardness from resistance to breaking and environmental change.
Review the actual gem, treatments, cut, exposed edges, and setting.
Match the complete piece to expected impacts, chemicals, heat, light, and maintenance.

Three properties, three different risks

Resists

Hardness: Scratching and abrasion
Toughness: Breaking, chipping, and cleavage
Stability: Change from heat, light, chemicals, and environmental conditions

Useful question

Hardness: What can abrade the surface?
Toughness: Where can impact reach an edge or internal weakness?
Stability: What exposures can alter the gem or treatment?

What a high result cannot prove

Hardness: Chip resistance or chemical safety
Toughness: Scratch resistance or treatment stability
Stability: Impact resistance or setting security
Guidance: No single column is a complete everyday-wear score.

How to use the framework

Method
Compare the three material properties first, then add inclusions, treatments, cut, exposed points, setting design, surrounding materials, and the wearer's likely activities.

Everyday wear is a whole-piece decision

Relative scale

Mohs is a ranking of scratch hardness, not a linear percentage or a total durability score.

Geometry matters

Corners, points, thin girdles, exposed edges, and setting height can change where an impact reaches the stone.

History matters

Inclusions, treatments, repairs, coatings, and unknown prior damage can narrow otherwise general guidance.

No gem is activity-proof

Disclosure
This framework cannot guarantee wear for a particular stone, occupation, sport, impact, chemical, or setting. Consequential choices need the exact material disclosure and qualified inspection.

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