An interesting feature of the dictionary is the inclusion of many incorrect or illegal terms which are still in use in some countries and which are often incorrectly mentioned in the gem literature. These misnomers are indicated as such and are cross-referenced to the correct term or expression as are the many obsolete and `fancy' names, regionalisms, and trade and trademarked names for synthetic stones and artificial products. This is particularly useful for the user - especially the reader who is working in a language other than his own - as he has an immediate guide to the proper usage of terms. In addition he will have a reference to correct spelling, synonyms and immediate translation into the other languages in the glossary.