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Educational Resources
How to read an emerald: what oil grades actually mean, why Colombian material commands a premium, how to spot glass-filled and synthetic stones, and what a laboratory report does and does not say.
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Start with oil and clarity enhancement explained, then what a laboratory report does and does not say. When you are ready to buy, loose stones lists the grade on every item.
The library
Read before you buy
- What “minor oil” actually means on an emerald
The none / minor / moderate / significant scale, oil versus resin, what each grade does to price, and how to care for a filled stone. - How to tell if an emerald is real
What to look for with a loupe, how glass and lab-grown stones give themselves away, and which home tests are worthless. - Untreated emeralds: what “no oil” is really worth
Why untreated stones command a premium, and why an untreated stone is not automatically a better stone. - Muzo, Chivor and Coscuez compared
What each Colombian mine actually produces, what gota de aceite means, and how Colombian material differs from Zambian. - Trapiche emeralds: the six-spoke rarity
How the pattern forms, why it is almost exclusively Colombian, and what separates a specimen from a curiosity.