Prehnite faceted tubes measure approximately 8x5mm up to 15x7mm in size, exhibit a glass like luster, the stones have excellent polish, a symmetrical pentagonal tube shape, are matched on strand for quality, gems are a light minty green hue, and the transparent Prehnite gems have internal characteristics that reflect light to create a soft glow within the stone. For a rare shape and exceptionally beautiful stone, this strand is world class in quality!