It's no secret that all natural gemstones are gorgeous, but sometimes even the most perfect jewels can be enhanced. Most gemstones on the market today have received some kind of treatment to bring out their beauty, but it's not always possible to know what those treatments are. In some cases, even in one single design, some gemstones will have been treated while others may have not. Our chart below highlights the most common treatments that certain gemstones receive, so you can always know whether your gemstone has been treated and how. Gemstone treatments often affect their value and price, with the highest prices being paid for gemstones that have received no enhancement beyond simply being cut and polished.