Gemstone Encyclopedia

Why Banding in Onyx Varies: Growth Layers and I...

Explore onyx banding clarity: the role of silica deposition, pigments, and internal features that make banding stronger or weaker in different specimens.

Why Banding in Onyx Varies: Growth Layers and I...

Explore onyx banding clarity: the role of silica deposition, pigments, and internal features that make banding stronger or weaker in different specimens.

The Role of Cabochon Cutting in White Sapphire:...

Explore the gemological reasons behind cabochon cutting of white sapphire, including inclusion concealment, optical effects like sheen and asterism, and weight retention.

The Role of Cabochon Cutting in White Sapphire:...

Explore the gemological reasons behind cabochon cutting of white sapphire, including inclusion concealment, optical effects like sheen and asterism, and weight retention.

Lab-Grown Grossular Garnet and the Optical Role...

Explore how facet design influences optical effects in synthetic grossular garnet, including dispersion, critical angle, and the difference between brilliant and step cuts.

Lab-Grown Grossular Garnet and the Optical Role...

Explore how facet design influences optical effects in synthetic grossular garnet, including dispersion, critical angle, and the difference between brilliant and step cuts.

Tiger's Eye Origins: How Source Locality Shapes...

Learn how the geographic origin of tiger's eye influences its quality, color, and value. South Africa leads the market, while Brazil and Namibia offer unique variations. Get buying tips from...

Tiger's Eye Origins: How Source Locality Shapes...

Learn how the geographic origin of tiger's eye influences its quality, color, and value. South Africa leads the market, while Brazil and Namibia offer unique variations. Get buying tips from...