Birthstone Durability Guide: Mohs Hardness & Everyday Wear
Mohs hardness is useful when choosing birthstone jewelry, but it answers only one question: how easily might the stone be scratched? For everyday wear, you also need to think about chipping, heat, chemicals and where the stone sits in the jewelry.
Hardness is not the whole of durability
The Mohs scale ranks scratch resistance. It is not linear, and a higher number does not tell you whether a gem will survive a knock. Gemologists also consider toughness, or resistance to breaking, and stability under heat, light and chemicals. GIA explains these three factors in its durability guide.
A few birthstone examples
- Ruby and sapphire: 9 on the Mohs scale, with excellent toughness. They are strong choices for jewelry worn often, though no setting is damage-proof. GIA care guide.
- Topaz: 8 for scratch resistance, but a sharp blow can split or chip it along a cleavage plane. GIA care guide.
- Citrine and amethyst: both quartz, at 7. Citrine has good toughness, but it still benefits from care against scratches and abrupt temperature changes. GIA care guide.
- Opal: about 5 to 6.5, with variable toughness. Protect it from scratches, hard knocks and high heat. GIA care guide.
- Pearl: about 2.5. Keep it away from abrasive contact and wipe it gently after wear. GIA care guide.
These are examples, not a ranking of every monthly stone. A gem's setting and any treatment also affect the care it needs.
How to use this when shopping
Think about the piece before the number. A ring tends to meet more knocks than a pendant, and an exposed stone needs more care than one sheltered by its setting. Check the individual listing, remove jewelry before rough activity, and store pieces separately so harder stones do not rub against softer ones.
For cleaning, follow the guidance for the specific gem and any stated treatment; do not assume one method suits every stone. Our jewelry care guide covers everyday habits, while the birthstone-by-month guide helps you find your month.