How unique do you like your gemstones? Jaspers often form from fossilised wood that has been buried in falls of volcanic ash, but on rare occasions they discover that some antediluvian beast has also been caught in the eruption and been buried. Suffice to say it is something of a rarity and each example is unique. Finding some is sheer luck. Finding enough to make a necklace, exceptional luck. Conversation piece value apart, I was attracted to this single row of stones by its pattern and was surprised when I found out what it was. It is sometimes called Dinosaur Blood Jasper if you want to be dramatic. 2.5cm beads. 43cm with sterling silver clasp.