"Collecting Costume Jewellery 101" is essentially a beginners' guide to the main makers of (American) designer costume jewellery. Other information is also given, such as how to repair and clean costume jewellery and what to do with unwanted jewellery, all of which would be useful to a person starting a costume jewellery collection. However, the vast majority of this book are devoted to summaries of the main jewellery making companies.
For most designers, the summary given is brief, comprising the dates of operation of the company; a brief history of the company; the signature look of the product; and buying recommendations. Nevertheless, this is more than enough for a beginning collector. Greater detail is given about Coro, Kramer, Trifari and Weiss, however, four designers whom Carroll recommends for beginning collectors. Numerous color photographs are also provided for each designer, with values given for each piece of jewellery.
For people seeking a more detailed discussion of designer costume jewellery, I recommend the sequel to this book, "Collecting Costume Jewellery 202", although both books are well worth investing in.