The variety of stones covered ranges from those familiar to most readers to the rare and unusual. Apatite, calcite, moldavite and obsidian are listed alongside the less well-known stones such as gaspéite, psilomelane and jeremejevite – stones normally reserved for small notes in more expensive texts, often without the photographs that this book makes good use of. Although not as widely known, these gemstones are given the same consideration and respect that the more ‘usual’ gemstones in expensive jewellery are afforded, providing a valuable insight into what can be done when jewellers think outside of the box.