Where do Emeralds in antique jewelry come from? Emeralds are among the most prized of gemstones. Owners understandably want to know about the source of these valuable gems in specimens […]
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Coatings used to give tanzanite a deeper (blue) color? The American Gem Trade Association Gemological Testing Center (AGTA-GTC) and American Gemological Laboratories (AGL) received a number of faceted tanzanite samples […]
Continue reading »CHAPTER XV. COLOURED PEARLS. Brighter the offspring of the morning dew, The evening yields a duskier birth to view ; The younger shells produce a whiter race, We greater age
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