Темы назначаются по ключевым словам, а не с помощью LLM. Количество материалов зависит от выбранных источников и может обновляться с задержкой до пяти минут.
If you’ve ever heard the phrase ‘cardinal gems’ and wondered what this means, now’s your chance to find out. Gem-A Gemmology Tutor Pat Daly breaks down this historic term and explains how the concept has stood the test of time. The term ‘cardinal gems’ may be used to spotlight five stones – diamond, ruby, sapphire,…
Diamonds are the best known and are among the most popular stones in the jewellery trade, having been valued for more than 2,000 years. If you have heard about diamonds fluorescing under ultraviolet light but don’t quite know what this means, how it’s relevant to gemmologists, or why it matters to diamond collectors, Pat Daly FGA DGA is here…
When we look at faceted gemstones, we see and appreciate their colours, transparency, brilliance and fire. What we sometimes take for granted, however, is the fashioning that makes it possible to enjoy these visual effects. To explain more, Gem-A Gemmology Tutor Pat Daly has created this useful introduction to diamond cut and shape, incorporating faceting…
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