SHANGHAI FAMOUS TRADE CO.,LTD
SHANGHAI FAMOUS TRADE CO.,LTD
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This watch case features a laboratory-grown sapphire body in a striking gray-violet hue, complemented by a vivid, artistic dial inspired by Van Gogh's The Starry Night. Sapphire watch cases are known for their exceptional hardness, scratch resistance, and luxurious transparency. Combining cutting-edge synthetic crystal technology with artistic expression, this sapphire case is ideal for luxury watch collectors and avant-garde timepiece designers.
Laboratory-grown sapphire watch cases are primarily produced using the Kyropoulos or Czochralski crystal growth method, followed by precision machining and polishing:
Crystal Growth: High-purity aluminum oxide (Al₂O₃) is melted at 2,050°C and slowly crystallized to form a large single-crystal sapphire boule.
Color Doping: Trace elements such as chromium, titanium, or iron are added during growth to yield colored variants like violet, gray, or pink.
Cutting: The boule is sliced using diamond wire saws into blanks for further processing.
CNC Machining: Sapphire blanks are meticulously milled into precise case geometries using diamond-coated tools.
Polishing: Multi-stage polishing with alumina slurry achieves high transparency and a jewel-like surface.
Drilling & Assembly: Holes for crowns, screws, and glass are ultrasonically drilled, and the final case is ready for watch assembly.
| Property | Value |
|---|---|
| Chemical Formula | Al₂O₃ (Aluminum Oxide) |
| Crystal Structure | Trigonal (Hexagonal system) |
| Hardness (Mohs Scale) | 9 (next to diamond) |
| Density | 3.97 – 4.0 g/cm³ |
| Transparency | >85% (visible range, polished) |
| Refractive Index | 1.76 – 1.77 |
| Melting Point | ~2050°C |
| Thermal Conductivity | ~35 W/(m·K) |
| Young’s Modulus | ~345 GPa |
| Standard Colors | Transparent, Blue, Pink, Gray-Violet |
Sapphire, particularly synthetic variants, is widely used in the jewelry and luxury goods sectors:
Watch Components: Cases, bezels, crowns, and sapphire crystal glasses for scratch resistance and visual appeal.
Jewelry Stones: Lab-grown blue, pink, and yellow sapphires offer cost-effective, ethical alternatives to mined gems.
Luxury Accessories: Used in cufflinks, rings, and even smartphone decorative elements.
Optical Jewelry Fusion: High-transparency sapphire is used as a fusion of form and function in tech-luxury gadgets.
Q1: Is synthetic sapphire real sapphire?
Yes. Laboratory-grown sapphire has the same chemical composition and physical properties as natural sapphire—it is simply grown under controlled conditions.
Q2: Why choose sapphire for watch cases?
Because of its unmatched hardness (Mohs 9), it is extremely resistant to scratches and abrasion, ensuring long-term clarity and elegance.
Q3: Can colored sapphire watch cases fade over time?
No. The color is inherent to the crystal and does not fade under UV or normal usage conditions.
Q4: Can sapphire cases be customized?
Yes. Color, size, finish, and even engravings can be customized during the manufacturing process, especially with CNC and laser technology.
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