Crystal Replacement: Fixing Scratches and Cracks
When the Crystal Cracks
A scratched or cracked crystal ruins a watch's appearance and can compromise water resistance. Replacement is straightforward and affordable — here is when to do it, what it costs, and whether to DIY.
When to Replace
- Deep scratches that catch a fingernail: surface swirls are cosmetic; deep gouges compromise clarity and seal
- Cracks: any crack means water can enter — replace immediately
- Chips at the edge: can spread under thermal stress — replace before they do
Crystal Types and Replacement Cost
| Crystal | Replacement Cost | DIY Difficulty |
|---|---|---|
| Mineral glass | $5-15 | Moderate — needs crystal press |
| Sapphire | $20-50 | Moderate — same tools, harder material |
| Hesalite/acrylic | $3-10 | Easy — can be polished instead |
Polishing vs Replacing
Hesalite (acrylic) crystals can be polished to remove scratches using Polywatch paste — a $5 fix that works remarkably well. Mineral and sapphire crystals cannot be polished; replacement is the only option for deep damage.
The Replacement Process
- Open the case back and remove the movement (or protect it with tape)
- Press out the old crystal using a crystal press or case press
- Clean the crystal seat thoroughly
- Press in the new crystal, ensuring even seating all around
- Test water resistance before regular use
Professional vs DIY
Crystal replacement requires a crystal press ($20-50 for a basic tool) and correct-sized dies. For standard crystals, DIY is feasible. For sapphire or pressure-tested watches, professional replacement ensures the seal is maintained.
Frequently Asked Questions
Can I upgrade from mineral to sapphire?
Yes, if the case accepts the same diameter. Check thickness compatibility — sapphire is often thinner than mineral.
Does crystal replacement affect water resistance?
It can — the new crystal must seat perfectly. Pressure testing afterward is recommended.
Polish or replace hesalite?
Polish first — it costs nothing and works for most scratches. Replace only if cracked or deeply gouged.