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This is a necklace of snowflake obsidian (a black volcanic glass with inclusions of white or gray spherulite that can look like snowflakes) beads with alternating smaller beads of sterling silver.  

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This necklace is made of Labradorite beads of varying sizes with interspersed smaller sterling silver ones. Labradorite is a greenish-gray variety of feldspar, which is a mineral found in igneous rock.  It comes from, coincidentally enough, Labrador, Canada among other places.  It has an iridescent optical effect that is known as--wait for it--labradorescence.    

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This is a Swarvoski beaded necklace, with larger red beads and smaller silver and white ones.

You probably can't help but have noticed that there's usually a cat hair on two on the back drops.  It's because Angie insisted on helping me as I was taking these pictures.  

She did start getting tired of the flash going off after a while.  In the middle photo, Angie is begrudgingly modeling the Labradorite necklace.  But after this, she'd had enough.