Tourmaline Silica Round Cut 6mm Set of 19 beads. These are B-grade beads, selected from a previous purchase. These stones are a mix of tourmaline and silica (also known as quartz, the material that makes up crystal). Some beads have pink tourmaline sections, while others have white or transparent silica sections. There are also some beads that are a single color, like rose quartz. For some reason, there are also green ones, which were included in the original lot when I bought them. The size is approximately 6mm in diameter. The hole diameter is around 0.4mm (with individual variations), and the wire used to string them is 0.35mm. 0.35mm Griffin cord passed through. The B-grade reasons are mainly: Color variations, shape distortions, and chips around the holes. I'm offering these at a bargain price for those who want to practice or try making accessories. (Since they haven't been used, they are listed as new and unused.) Please understand the above, and also understand that it is difficult to perfectly reproduce the actual colors in the photos before purchasing. I have taken photos to show the colors as accurately as possible and to make the size clear. Please refrain from cancellations or returns due to reasons such as "different from the image."