Gemstone Surface Features for Hazy Appearance and Scintillation

The patent segments the surface features into distinct size categories: nanometer-sized features (10-100 nm) for brilliance enhancement, micrometer-sized features (1-10 μm) for hazy white appearance, and millimeter-sized features (0.1-1 mm) for scintillation. This segmentation allows each feature type to independently contribute to different optical effects without interfering with others.

The patent applies different feature sizes to different facets or regions of the gemstone. Specifically, nanometer-sized features are applied to create brilliance, micrometer-sized features create hazy white appearance, and millimeter-sized features enhance scintillation. This local differentiation of quality allows the gemstone to exhibit multiple optical effects simultaneously in different regions.

The patent employs preliminary masking steps before etching to define the regions where different sized features will be created. By pre-patterning masks with specific geometries and dimensions, the subsequent etching process automatically produces features of the desired sizes without requiring precise control of etching parameters alone. This preliminary structuring simplifies the overall manufacturing precision requirements.

The patent transitions from controlling only lateral feature dimensions to also controlling feature depth independently. By using multi-layer masks and selective etching, the depth of features can be controlled separately from their lateral dimensions, adding an extra degree of freedom. This dimensional separation allows broader appearance control versatility while maintaining manageable manufacturing precision for each individual parameter.

The patent merges multiple feature creation steps into a unified etching process. By combining the formation of nanometer-sized features, micrometer-sized features, and millimeter-sized features into sequential etching steps using progressively larger masks, the overall device complexity is reduced. The same basic etching apparatus and chemistry are used for all feature sizes, eliminating the need for separate specialized processes for each feature type.

The patent employs periodic action through sequential masking and etching cycles. Each cycle creates features of a specific size range, with the process repeating for different feature sizes. This periodic approach allows systematic control over feature formation complexity, where each iteration builds upon the previous one rather than requiring all features to be created simultaneously in a single complex step.