Aquamarine (photo: Matt Bokor)

One of this month’s birthstones is beryl, a simple colorless crystal in its pure form. But Guatemala is never colorless, so to celebrate May we must find some impure beryl, which gemologists tell us can be green, blue, yellow, red, white. Whatever, it’s still beryl, with different names. Let’s go find this month one crystal from the impure-beryl list: aquamarine. […]

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