Gemstone Knowledge
SOOKJAI KNOWLEDGE
Gemstone Knowledge
A considered guide to gemstones — from colour and cut to origin, treatment and the stories behind each stone.
Sapphire · Colour
Madagascar Sapphire: Colour, Character and Origin
Madagascar sapphire spans far more than one familiar look. Explore the blue-green character traders sometimes associate with the origin, its wide range of sapphire colours, the brighter character seen in some Madagascar rubies, and why appearance alone cannot establish where a stone came from.
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Origin · Other Gemstones
Siam Ruby: The Story Behind Thailand’s Historic Ruby Name
Siam Ruby is a historic name connected with the ruby fields of eastern Thailand. Explore its purplish-red association, the Chanthaburi-Trat deposits, the decline of large-scale mining and how local ruby helped shape Thailand into a major coloured-stone centre.
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Sapphire · Origin
Kashmir Sapphire: Why It Became So Famous
Kashmir sapphire became famous through a remarkable 19th-century discovery, a brief period of important production, celebrated velvety blue material and extremely limited later supply. Explore the history behind the reputation, how laboratories approach Kashmir origin, and why rarity does not decide personal preference.
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Sapphire · Origin
Burmese Sapphire: Understanding Its Reputation and Rarity
Burmese sapphire carries a long reputation shaped by Mogok, exceptional historic material and collector interest. Learn what Myanmar origin really tells us, why fine examples can be rare, how laboratories approach origin, and why a famous source does not determine the beauty of an individual stone.
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Sapphire · Origin
Sri Lankan Sapphire: What Makes Ceylon Sapphire Distinctive?
Ceylon Sapphire refers to sapphire from Sri Lanka, but origin does not define one shade of blue or guarantee a particular appearance. Explore Sri Lanka’s long gem history, alluvial deposits, colour diversity, geuda, treatment and how laboratories approach geographic origin.
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