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Sapphire, the Early History, with Dr Jack Ogden
Jack Ogden - Sri Lankan Legacy: History of Sapphires
Dr Jack Ogden Seminar May 2018 - The Early History of Diamonds
Let's read & talk about Gemology: Jack Ogden investigating the legend of the Black Prince´s Ruby.
Let’s talk Diamonds with Jack Ogden
Jewellery History
Diamonds in Early History
"A History of Gemstones", with Helen Molesworth
From rivers to oceans: Borneo’s diamonds to the world
Gem-A Live: In Discussion with the Editor of The Journal of Gemmology, Volume 37, No. 4
Cycles of Life: Highlights from the Benjamin Zucker Family Collection
Amethyst, a brief overview
