---
description: Generic sapphire crystal for Cartier octagonal cases. 18.9mm square, domed. Scratch-resistant aftermarket replacement for damaged original crystals.
title: Generic Cartier Octagonal Sapphire Crystal 18.9mm - Sofly
image: https://www.soflypart.com/wp-content/uploads/2022/04/DSC09101.jpg
---
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- **Generic Cartier Octagonal Sapphire Crystal 18.9mm**
[](https://www.soflypart.com/wp-content/uploads/2022/04/DSC09101.jpg)
# Generic Cartier Octagonal Sapphire Crystal 18.9mm
$45.00
You Saved
| Brand | Choose an option Cartier- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $45.00 |
| 3 - 4 | 5% | $42.75 |
| 5 - 9 | 7% | $41.85 |
| 10 - 14 | 10% | $40.50 |
| 15+ | 15% | $38.25 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $45.00 |
| 3 - 4 | 5% | $42.75 |
| 5 - 9 | 7% | $41.85 |
| 10 - 14 | 10% | $40.50 |
| 15+ | 15% | $38.25 |
Generic Cartier Octagonal Sapphire Crystal 18.9mm quantity
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## Product Description
This is a generic replacement sapphire crystal for Cartier watches with octagonal cases, measuring 18.9mm × 18.9mm (square) with a domed profile. Made of synthetic sapphire glass, it offers exceptional scratch resistance (Mohs 9) and excellent optical clarity, serving as a direct substitute for a damaged or scratched original crystal. As an aftermarket part, it provides a cost-effective repair solution for watchmakers and enthusiasts.
## Features & Function
- **Sapphire Crystal** – Mohs 9, highly scratch-resistant and optically clear.
- **Precision Square Size** – 18.9mm × 18.9mm, designed for Cartier octagonal cases.
- **Domed Profile** – Classic curved appearance, enhances the watch’s elegance.
- **Generic Aftermarket** – Non-original but manufactured to OEM specs for direct replacement.
- **Cost-Effective** – Affordable alternative for repair or restoration.
## Specifications
| Parameter | Details |
| --- | --- |
| Compatible Case | Cartier octagonal case (e.g., Santos Galbée, some Must de Cartier models) |
| Type | Generic aftermarket |
| Material | Synthetic sapphire |
| Shape | Square with domed profile |
| Length × Width | 18.9 mm × 18.9 mm |
| Thickness | Not specified (typically \~1.5-2.5mm, confirm with product) |
## Applications
- Cartier Santos Galbée models using 18.9mm square crystals
- Cartier Must de Cartier or other octagonal case watches (verify original size)
- Replacement of damaged, deeply scratched, or aged original crystals
- Crystal refurbishment or repair projects
## FAQ
**1. Is this a genuine Cartier crystal?**
No. It is a generic aftermarket replacement, not original, but sized specifically for 18.9mm octagonal Cartier cases.
**2. Which specific Cartier models does this fit?**
It fits watches using an 18.9mm square domed crystal, such as some Santos Galbée (older versions) and certain Must de Cartier models. Measure your original crystal to confirm.
**3. What should I pay attention to during installation?**
Use a new sealing gasket, apply UV adhesive or crystal glue, and press evenly with a crystal press. Ensure the dome faces outward. Professional installation is recommended.
**4. Will the original water resistance be maintained?**
Water resistance depends on the gasket and adhesive. Proper installation with a new gasket can restore everyday splash resistance (typically 30m). A water resistance test is advised.
**5. Is a gasket included?**
Usually not. The sealing gasket must be purchased separately. Confirm with the seller.
## Why Choose SOFLY Watch Parts?
- Fast worldwide shipping within 3 business days.
- Competitive pricing on Seiko/Hattori calibers.
- 3,000+ watch movements and parts in stock.
- Trusted by watchmakers worldwide.
- Personalized sourcing support via **info@soflypart.com** or WhatsApp **+86 18620212114**.
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Made of synthetic sapphire glass, it offers exceptional scratch resistance (Mohs 9) and excellent optical clarity, serving as a direct substitute for a damaged or scratched original crystal. As an aftermarket part, it provides a cost-effective repair solution for watchmakers and enthusiasts. Features & Function Sapphire Crystal\u00a0\u2013 Mohs 9, highly scratch-resistant and optically clear. Precision Square Size\u00a0\u2013 18.9mm \u00d7 18.9mm, designed for Cartier octagonal cases. Domed Profile\u00a0\u2013 Classic curved appearance, enhances the watch\u2019s elegance. Generic Aftermarket\u00a0\u2013 Non-original but manufactured to OEM specs for direct replacement. Cost-Effective\u00a0\u2013 Affordable alternative for repair or restoration. 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What should I pay attention to during installation? Use a new sealing gasket, apply UV adhesive or crystal glue, and press evenly with a crystal press. Ensure the dome faces outward. Professional installation is recommended. 4. Will the original water resistance be maintained? Water resistance depends on the gasket and adhesive. Proper installation with a new gasket can restore everyday splash resistance (typically 30m). A water resistance test is advised. 5. Is a gasket included? Usually not. The sealing gasket must be purchased separately. Confirm with the seller. Why Choose SOFLY Watch Parts? Fast worldwide shipping within 3 business days. Competitive pricing on Seiko/Hattori calibers. 3,000+ watch movements and parts in stock. Trusted by watchmakers worldwide. 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It fits watches using an 18.9mm square domed crystal, such as some Santos Galb\u00e9e (older versions) and certain Must de Cartier models. Measure your original crystal to confirm. 3. What should I pay attention to during installation? Use a new sealing gasket, apply UV adhesive or crystal glue, and press evenly with a crystal press. Ensure the dome faces outward. Professional installation is recommended. 4. Will the original water resistance be maintained? Water resistance depends on the gasket and adhesive. Proper installation with a new gasket can restore everyday splash resistance (typically 30m). A water resistance test is advised. 5. Is a gasket included? Usually not. The sealing gasket must be purchased separately. Confirm with the seller. Why Choose SOFLY Watch Parts? Fast worldwide shipping within 3 business days. Competitive pricing on Seiko/Hattori calibers. 3,000+ watch movements and parts in stock. Trusted by watchmakers worldwide. 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