Sapphire Crystal vs Mineral Glass: What Lasts?

A concise material reference

Timex’s crystal FAQ describes acrylic as scratch-prone but impact resistant, mineral glass as harder than acrylic and not simply buffed, and sapphire as scratch resistant but susceptible to a hard impact. Its crystal-care article notes that an anti-reflective coating can be softer than the crystal.

Visible damage, coatings, fit, and replacement options should be assessed for the individual model; a watchmaker can advise on a damaged crystal.

Scratches, impacts and care compared

What to check before buying

Our care guide covers safe cleaning for the crystal and case. The configurator shows the options currently offered. When choosing to buy a Seiko mod, compare the Sub Mod and Date Mod styles and explore our NH35 Seiko mods.

Choosing the crystal

Start with the watch and variant you want to configure. Compare the crystal material listed in the product description, the case shape and how easily you can read the dial. For a replacement crystal, note the watch reference and ask a watchmaker to check the dimensions, gasket and fitting.

The MedoMods configurator lets you choose a complete watch. To consider the crystal alongside the rest of the design, see our dial guide and Sub Mod collection.

FAQ

Can you polish a scratch out of sapphire crystal?

Usually not with consumer polish. For visible damage, ask a watchmaker whether replacement is appropriate.

Is mineral glass bad?

Not inherently. Check the crystal specified for the particular watch and consider how you intend to use it.

Why do manufacturers still use acrylic?

Material selection can reflect a watch’s design and intended use. Confirm the specified crystal and care advice for the model you are considering.

Can a mark be in the anti-reflective coating?

Yes. An anti-reflective coating can be softer than the crystal and develop its own surface marks. Ask a watchmaker to check whether the mark affects the crystal or coating before using a polishing product.

What information do I need for a replacement crystal?

Note the watch reference and selected variant. A watchmaker should check the dimensions, gasket and fitting; the crystal material alone does not establish a suitable replacement.