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Tray of calibrated multicolour tanzanite in pastel yellow, peach, lavender and blue
Precious vs Semi-Precious Gemstones: What the Labels Really Mean
Diamond, ruby, sapphire and emerald are called precious. What makes them rarer and more valuable than other gems, what the price and auction data show, and how experts judge any... 阅读详细内容…
Pastel sapphires in fancy geometric cuts
Inside the Stone Box: Pastel Sapphires, Emeralds and a Royal Blue Oval
What crossed our sorting table this season: a parcel of emeralds, pastel sapphires in fancy cuts, a pink heart in yellow gold and one royal blue oval we keep coming... 阅读详细内容…
Untreated no-oil Colombian emerald, 1.82 ct oval, on a black background
Untreated, Heat Only or Minor Oil? How to Read a Gemstone Treatment Label
Most coloured gemstones are treated in some way. Here's what "untreated", "heat only", "minor oil" and "glass filled" really mean, and how each one affects value and care. 阅读详细内容…