BEHANDLUNGEN von Frieden

Enhancements

Today, many coloured gemstones are treated to enhance their colours. One of the main jobs of an experienced gemmologist is to detect these treatments. It is mandatory to declare all enhancements in the gemstone trade. Natural coloured gemstones are marked as having NTE (No Thermal Enhancement). These gemstones are scarce, and their prices are frequently higher than those of treated stones.