Popular teardrop shape dangle earrings with french wires have heishi shape beads. Reconstituted turquoise beads are 4mm x 2mm each, and Pen shell heishi beads are 2.8mm x 2.4mm each. Total drop length of these earrings is 67mm. Handmade in the USA and .925 sterling silver. What is pen shell? Pen shells are a type of clam that have a shell shaped like a quill pen and are found off the Gulf Coast of Florida.