Gemstone Knowledge
SOOKJAI KNOWLEDGE
Gemstone Knowledge
A considered guide to gemstones — from colour and cut to origin, treatment and the stories behind each stone.
Certification
What a Gemstone Report Can — and Cannot — Tell You
A gemstone laboratory report can establish important facts about identity, treatment and sometimes origin, but it cannot replace the visual and personal experience of the gemstone itself.
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Certification
How to Read a Gemstone Laboratory Report
A clear guide to reading a gemstone laboratory report, from verification and identification to treatment, geographic origin and comments.
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Colour · Other Gemstones
Fire Opal: The Warm and Vivid Side of Opal
Fire opal reveals a warm side of the opal family, where yellow, orange and red body colours can glow with or without the shifting play-of-colour usually associated with opal.
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Colour · Other Gemstones
Opal: A Gemstone Made of Colour and Light
Opal creates colour through an extraordinary relationship between microscopic silica structure, light and movement, producing a gemstone that can look different from one angle to the next.
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Colour · Other Gemstones
Topaz: Exploring Blue, Golden and Imperial Colours
Topaz reaches far beyond familiar blue, moving through golden, orange, pink and Imperial colours whose different histories reveal the remarkable breadth of a single mineral.
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Colour · Other Gemstones
Kunzite: Soft Pink, Lilac and Violet in One Gemstone
Kunzite moves through soft pink, lilac and violet, with pleochroism, transparency and crystal direction giving its gentle colour an unusually fluid character.
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Origin · Other Gemstones
Santa Maria Aquamarine: The Story Behind One of Aquamarine’s Most Famous Names
Santa Maria began as a Brazilian locality and became one of aquamarine’s most recognizable names, leaving a legacy that now reaches far beyond the place where the story began.
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Colour · Other Gemstones
Aquamarine: The Quiet Beauty of Blue
Aquamarine reveals a quieter expression of blue, where colour, transparency, depth and light work together to create a gemstone with an open and distinctive character.
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Garnet
Malaya Garnet: The Garnet That Didn’t Fit the Usual Categories
Malaya garnet grew into an identity of its own precisely because its colours and chemistry did not fit neatly into the garnet categories the trade already knew.
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Garnet · The Sookjai Perspective
Why Garnet Is So Much More Diverse Than Its Reputation Suggests
Garnet is often remembered as a deep red gemstone, yet its mineral family reaches through vivid green, orange, honey, purple, colour change and remarkable optical effects.
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Colour · Garnet
Colour-Change Garnet: One Gemstone, Two Different Moods
Colour-change garnet reveals how gemstone chemistry and illumination work together, allowing one stone to show distinctly different colours—and different moods—under different light sources.
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Colour · Garnet
Hessonite Garnet: Warm Honey, Cinnamon and Golden Tones
Hessonite is the warm side of grossular garnet, moving through honey, cinnamon, golden orange and reddish-brown tones with a distinctive internal character of its own.
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