Russian amazonite and smoky quartz necklace with sterling silver clasp

This is a pre owned necklace in good to excellent condition. Please note that the brown pendant stone in the center has some small surface scratches on it. No other issues found.  Genuine Russian amazonite 10 mm beads stationed with 6 mm smoky quartz beads. Measures 18 inches in length with a 925 sterling silver clasp. Strung on sturdy jewelers wire. Sadly the big brown clear stone in the center is not smoky quartz like the smaller beads. It tests as some kind of synthetic / glass. Reasonable offers considered