Gemstone Encyclopedia
The Complete Onyx Guide: Black Onyx, Natural On...
Discover the fascinating history and gemology of onyx, from natural banded chalcedony and black onyx to sardonyx, gemstone treatments, important sources, and the characteristics that determine quality and value. Learn...
The Complete Onyx Guide: Black Onyx, Natural On...
Discover the fascinating history and gemology of onyx, from natural banded chalcedony and black onyx to sardonyx, gemstone treatments, important sources, and the characteristics that determine quality and value. Learn...
The Complete Citrine Guide: Natural Citrine, Ma...
Explore the fascinating world of citrine, including natural and heat-treated varieties, Madeira citrine, important mining locations, gemstone quality, and the characteristics that distinguish exceptional citrine from ordinary material.
The Complete Citrine Guide: Natural Citrine, Ma...
Explore the fascinating world of citrine, including natural and heat-treated varieties, Madeira citrine, important mining locations, gemstone quality, and the characteristics that distinguish exceptional citrine from ordinary material.
The Complete Spinel Guide: Mahenge, Color, Orig...
An expert guide to spinel, including Mahenge spinel, cobalt blue spinel, historical significance, and what separates fine stones from commercial material.
The Complete Spinel Guide: Mahenge, Color, Orig...
An expert guide to spinel, including Mahenge spinel, cobalt blue spinel, historical significance, and what separates fine stones from commercial material.
The Complete Pearl Guide: Types, Formation, Lus...
An expert guide to pearls, including all major types, how they form, and what separates fine pearls from average quality.
The Complete Pearl Guide: Types, Formation, Lus...
An expert guide to pearls, including all major types, how they form, and what separates fine pearls from average quality.
The Complete Peridot Guide: Formation, Color, O...
An expert guide to peridot, its volcanic origins, signature green color, and what separates fine stones from average material.
The Complete Peridot Guide: Formation, Color, O...
An expert guide to peridot, its volcanic origins, signature green color, and what separates fine stones from average material.
The Complete Turquoise Guide: Formation, Matrix...
An expert guide to turquoise, including formation, treatments, origins, and how to identify high-quality natural stones.
The Complete Turquoise Guide: Formation, Matrix...
An expert guide to turquoise, including formation, treatments, origins, and how to identify high-quality natural stones.