Price range: $7.00 through $18.00
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This is a generic flat round sapphire crystal with a uniform thickness of 2.0mm, available in diameters ranging from 16.5mm to 45mm (typically in 0.5mm or 1.0mm increments – consult the seller). It is designed to replace front watch crystals or case back glasses for a wide variety of watch models. Made of synthetic sapphire glass (Mohs hardness 9), it offers exceptional scratch resistance and excellent optical clarity, serving as a direct substitute for a damaged or scratched original crystal.
Material: Synthetic sapphire (Mohs 9), highly scratch-resistant, resistant to daily wear.
Uniform thickness: 2.0mm fixed thickness, easy to stock and manage, suitable for most standard case groove depths.
Diameter range: 16.5mm – 45mm, covering common sizes from small ladies‘ watches to large sports watches.
Profile: Flat round – completely flat surface, no curvature.
Optical performance: Usually uncoated (AR coating available upon request – consult seller).
Q1: How to choose the correct diameter?
A: Measure the inner diameter of the case’s mounting groove (or the original crystal diameter) with calipers. Select a diameter 0.05‑0.10mm smaller than the measurement to allow room for adhesive or gasket. For example, if the measurement is 30.0mm, choose 29.90mm or 29.95mm.
Q2: Can this crystal be used as a case back (exhibition back)?
A: Yes. As long as the size matches and the thickness fits the case back groove depth, it can be used as a case back glass. Note that case back crystals usually do not require an AR coating and need a matching gasket.
Q3: Is the 2.0mm thickness suitable for all watch cases?
A: Not necessarily. Measure the thickness of your original crystal first. 2.0mm is a common standard thickness for many Swiss and Japanese watches. However, if the original thickness is 1.5mm or 2.5mm, using 2.0mm may cause installation difficulties or sealing issues. Always verify the original thickness.
Q4: Can I order a crystal with anti‑reflective coating?
A: Yes, custom coating is available. However, coating will increase cost and lead time. Please discuss your requirements with the seller before ordering.
Q5: Can I replace the crystal at home?
A: If you have a crystal press and relevant experience, you may attempt it. However, sapphire crystals are brittle and can crack under uneven pressure. Inexperienced users are strongly advised to entrust the replacement to a professional watchmaker.
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