A few stones are frequently called "Yellow Turquoise." Yellow Turquoise beads from Rings & Things are usually a jasper or serpentine, and are not dyed or enhanced. This is a hard yellow stone with brown-to-black (and occasionally red or green) matrix. The black matrix in yellow turquoise is often attracted by a magnet, and is probably hematite. Another variety of yellow turquoise is "soft yellow turquoise", which is theoretically a pale natural turquoise from China's Hubei province, dyed a deep yellow. However, we suspect it is actually dyed magnesite, dolomite, calcite or even limestone. When we stock this form of yellow turquoise, we are careful to mark it dyed or enhanced, so you know to take extra care when cleaning and storing it. There is no such thing as "yellow turquoise" -- it is simply a descriptive name common on the gemstone industry.