A recent study revealed that approximately 90 percent of the turquoise gemstones available in the market are actually dyed Howlite. The physical appearances of both are exactly similar, which means that customers who are in the market to buy turquoise diamond rings may find it difficult to ensure they are getting a real turquoise ring with diamonds. This is why diamond cutters advise customers to thoroughly check the diamond certification documents of their preferred ring before making a purchase.