"The presence or absence of very high-value stones can have a...

"The presence or absence of very high-value stones can have a huge impact on the overall valuation.” While that doesn’t mean one stone can make or break a valuation, Armstrong noted that “one stone can make a huge difference.” The main reason is that “if you see [a large stone], then you know they exist — you can argue then about … how frequently they might realistically appear in a production scenario.” However, if such stones don’t turn up “it’s a lot tougher, you’re trying to prove a negative in a sense.”

North Arrow Minerals Hits a Bump with Bulk Sample Valuation

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http://diamondinvestingnews.com/12923-north-arrow-minerals-qilalugaq-nunavut-pikoo-saskatchewan.html