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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,…
Les hele saken hos Gem-A (åpnes i en ny fane)Spectroscopy is the observation or measurement of the absorption and emission of electromagnetic radiation by gemstones. Today, this methodology and its associated tools are vital for gemmologists and can be used to reliably indicate a gemstone’s identity. Here, Gem-A Gemmology Tutor Pat Daly explains more about the history and significance of this scientific technique. Sir Isaac Newton observed the spectrum of…
Les hele saken hos Gem-A (åpnes i en ny fane)Colour is one of the most appealing features of gemstones and is often the main reason why they are valued. However, it is also true to say that some mineral colours are rarer and more prized than others. Here, Gem-A Gemmology Tutor Pat Daly explores the nuanced world of colour in gemstones, including brilliant reds, Kashmir sapphires,…
Les hele saken hos Gem-A (åpnes i en ny fane)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…
Les hele saken hos Gem-A (åpnes i en ny fane)Dyeing is probably the most common and cheapest way to treat gem materials, to make inferior stones seem to be of good quality or to substitute inexpensive materials for costly natural stones. Here, Gem-A Gemmology Tutor Pat Daly takes a closer look at dyed material and explains how experienced gemmologists can identify evidence of such…
Les hele saken hos Gem-A (åpnes i en ny fane)Gemmologists often encounter simulants of natural gemstones, like artificial glass paste. Synthetic and composite stones of various kinds may be troublesome to identify, but those made of glass are among the most common and are usually easy to recognise. As Gem-A Tutor Pat Daly describes in the article below, glasses may also be natural stones,…
Les hele saken hos Gem-A (åpnes i en ny fane)The fascinating internal world of gemstones is an important area of study for gemmologists. Although some inclusions are common, others are far rarer and more elusive. Some professionals may go their entire lives without seeing these specific internal features in person. Here, Gem-A Tutor Pat Daly shares some ‘once in a lifetime’ inclusions and what…
Les hele saken hos Gem-A (åpnes i en ny fane)The description ‘oily green’ is sometimes used in connection with peridot. It is not intended as a criticism; it is a term which has been traditionally associated with the colour of this stone. Here, Gem-A Tutor Pat Daly explains why this descriptive moniker is used and what it tells us about this vibrant green mineral… Peridot is a beautiful gemstone It can be brown…
Les hele saken hos Gem-A (åpnes i en ny fane)If you are new to gemmology, you may not be wholly familiar with the gem material known as spinel. Historically, these gems were confused with corundum, especially in red hues, which adds to its mystery and intrigue for gemmologists. Today, however, they are an important stone used in fine and high jewellery and deserve their own spotlight. Here, Gem-A tutor Pat Daly…
Les hele saken hos Gem-A (åpnes i en ny fane)Overskrifter og innledende avsnitt hentes fra utgivernes offentlige RSS-feeder. Hele artiklene, bildene og opphavsretten tilhører den enkelte utgiver. Jewellery.HK er ikke tilknyttet disse publikasjonene og går ikke god for selskapene som omtales. Sist hentet inn 4 Nov 2026, 21:07 UTC.
