---
description: Generic Cartier Ballon Bleu WSBB0021 sapphire crystal 29mm, fits 37mm case. Domed blue AR. Aftermarket replacement.
title: Generic Cartier Ballon Bleu WSBB0021 Sapphire Crystal 29mm - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/09/DSC09208.jpg
---
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- **Generic Cartier Ballon Bleu WSBB0021 Sapphire Crystal 29mm**
[](https://www.soflypart.com/wp-content/uploads/2019/09/DSC09208.jpg)
# Generic Cartier Ballon Bleu WSBB0021 Sapphire Crystal 29mm
$40.00
You Saved
| Brand | Choose an option Cartier- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $40.00 |
| 3 - 4 | 5% | $38.00 |
| 5 - 9 | 7% | $37.20 |
| 10 - 14 | 10% | $36.00 |
| 15+ | 15% | $34.00 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $40.00 |
| 3 - 4 | 5% | $38.00 |
| 5 - 9 | 7% | $37.20 |
| 10 - 14 | 10% | $36.00 |
| 15+ | 15% | $34.00 |
Generic Cartier Ballon Bleu WSBB0021 Sapphire Crystal 29mm quantity
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## Product Description
Generic sapphire crystal for Cartier Ballon Bleu WSBB0021. Diameter 29.0mm, total thickness 3.5mm, step thickness 0.8mm. Fits 37mm case. Synthetic sapphire (Mohs 9), scratch resistant. Aftermarket replacement for damaged original crystals.
## Features & Function
- Domed shape with blue AR coating – signature Ballon Bleu design, reduces glare
- Synthetic sapphire – excellent scratch resistance (Mohs 9)
- Precise dimensions: 29.0 × 3.5 × 0.8 mm
- High optical clarity – maintains dial visibility
- Affordable alternative to OEM crystal
## Specifications
| Parameter | Value |
| --- | --- |
| Compatible model | Cartier Ballon Bleu WSBB0021 |
| Case size | 37 mm |
| Crystal diameter | 29.0 mm |
| Total thickness | 3.5 mm |
| Step thickness | 0.8 mm |
| Material | Synthetic sapphire |
| Hardness | Mohs 9 |
| Type | Aftermarket |
## Applications
- Replace scratched, cracked, or damaged original crystals on Cartier Ballon Bleu WSBB0021 (37mm case).
- Professional watch repair and restoration.
## Frequently Asked Questions
**Q1: Genuine Cartier part?**
No, generic aftermarket.
**Q2: Does it fit other 37mm Ballon Bleu models?**
Designed for WSBB0021. Measure your original crystal before ordering.
**Q3: Self‑install?**
Professional recommended for water resistance.
## 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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Features & Function Domed shape with blue AR coating \u2013 signature Ballon Bleu design, reduces glare Synthetic sapphire \u2013 excellent scratch resistance (Mohs 9) Precise dimensions: 29.0 \u00d7 3.5 \u00d7 0.8 mm High optical clarity \u2013 maintains dial visibility Affordable alternative to OEM crystal Specifications Parameter Value Compatible model Cartier Ballon Bleu WSBB0021 Case size 37 mm Crystal diameter 29.0 mm Total thickness 3.5 mm Step thickness 0.8 mm Material Synthetic sapphire Hardness Mohs 9 Type Aftermarket Applications Replace scratched, cracked, or damaged original crystals on Cartier Ballon Bleu WSBB0021 (37mm case). Professional watch repair and restoration. Frequently Asked Questions Q1: Genuine Cartier part?\u00a0 No, generic aftermarket. Q2: Does it fit other 37mm Ballon Bleu models?\u00a0 Designed for WSBB0021. Measure your original crystal before ordering. Q3: Self\u2011install?\u00a0 Professional recommended for water resistance. 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