In the world of premium hardware, "glimmer" is a language. When a customer rotates a device in their hand and a sharp, silver flash catches the light, their brain instantly registers quality.

That flash is rarely accidental; it is the result of Diamond-Cutting (DC) paired with Bright Anodizing.

At Coboggi, we treat this process as a micro-surgical operation. Here is how we turn a standard aluminum edge into a piece of industrial jewelry.

1. The Tool: Monocrystalline Diamonds

Unlike standard CNC bits made of tungsten carbide, Diamond-Cutting uses a single-crystal natural or synthetic diamond.

• Why Diamond? Diamonds can be ground to an edge that is molecularly sharp.

• The Result: Instead of "tearing" the aluminum fibers (which creates a matte look), the diamond tool shears the metal so cleanly that the surface is inherently reflective, even before it hits the polishing lab.

2. The Process: The "Anodize-Cut-Anodize" Workflow

To get the high-contrast look (for example, a black body with silver edges), we follow a rigorous sequence:

1. First Anodizing: The entire part is anodized in the primary color (e.g., Deep Matte Black).

2. Diamond-Cutting: The part is re-jigged in a high-speed CNC machine. The diamond tool carves a precise chamfer (30℃ or 45℃), stripping away the black layer to reveal the raw, mirror-shorn aluminum underneath.

3. Bright Anodizing (Sealant): We perform a secondary "Bright Anodizing" pass. This applies a crystal-clear, high-gloss protective layer over the raw silver edge to prevent oxidation without losing the "mirror" effect.

3. The "Bright" in Bright Anodizing

Standard anodizing is meant to protect; Bright Anodizing is meant to enhance. We use a specialized chemical "electropolishing" bath before the final seal. This smooths out the microscopic peaks and valleys of the metal, maximizing specular reflection.

• Standard Anodizing: Diffuses light (Matte).

• Bright Anodizing: Reflects light (Mirror).

4. Technical Challenges: The Zero-Tolerance Zone

Diamond-cutting is unforgiving. If the CNC machine vibrates even by 5μm, the "mirror" will have tiny visible lines (chatter marks).

• Coboggi’s Solution: We use ultra-stable, high-RPM spindles (up to 60,000 RPM) and custom-built vacuum fixtures to ensure the part does not move a fraction of a millimeter during the cut.

5. Where to Apply This Finish?

• Bezels: Around camera lenses or smartphone screens.

• Buttons & Knobs: To make functional elements "pop" against a matte chassis.

• Logo Inlays: Carving brand names into anodized surfaces for a permanent, premium shine.

Conclusion: Designing with Contrast

Diamond-cutting isn't just a decorative choice; it's a tool for Visual Hierarchy. By using light to draw the eye to specific edges, you define the silhouette of your product. It is the ultimate "finishing touch" for brands that refuse to blend in.