The Middle Eastern origins of certain precious jewels have been traced in an innovative move by researchers.
They used a technique with the potential to prise open the backstory of valuable stones, including those set in royal crown jewels.
Gemstones from ancient mines were analysed using modern spectroscopy to provide unprecedented insight into historical trade routes.
Researchers were able to decipher a gem's past and the journeys it has taken, unlocking previously hidden histories.
“Gemstones such as emerald and peridot have been mined since antiquity,” study author Adel Surour said. “For example, royal crowns in Europe are decorated with peculiar gemstones that originate from either Africa or Asia.”
The new approach enables a precise differentiation between natural and synthetic gems and offers a deeper understanding of their respective characteristics.
Some of the gemstones have provided a window into historical trade routes thanks to their particular elemental composition and atomic make-up, which act as a type of identifying fingerprint.
A study, published in AIP Advances, involved rapid analysis of gemstones found in the Arabian-Nubian Shield, which were compared with counterparts from around the world.
The shield is a vast treasure trove of mineral deposits in present-day Egypt and Saudi Arabia dating back to Earth’s earliest geological age.
“We showed the main spectroscopic characteristics of gemstones from these Middle East localities to distinguish them from their counterparts in other world localities,” Mr Surour said.
Peridot, a semi-precious olive green crystal used in jewellery. All photos: Getty Images
Peridot, pictured here in its rough form, has been mined since antiquity.
Beryl crystals come in a variety of colours - when they're green, they are better known as emeralds.
Amethyst gets its signature violet hue from iron impurities.
Modern spectroscopy techniques allow researchers to determine the origin of gems like Amazonite, pictured here.
The deep green colour of dioptase crystals comes from its copper content.
The team focused on various silicate gems such as emeralds from Cleopatra’s mines in ancient Egypt, plus other stones from historical sites mostly dating back to Roman times.
The study was able to conclude that specific gemstones including amethyst, peridot, amazonite and emerald are originally from Egypt and Saudi Arabia.
For each, analysis allowed for the identification of their unique fingerprint, which helped in the determination of their origin and differences.
The study concludes that, despite their unique lines, these gemstones share elements due to their collection from various environments.
Locations of the investigated gem minerals from Egypt and Saudi Arabia. 1. Peridot, Zabargad (St. John’s), off the Egyptian Red Sea coast. 2. Peridot from Harrat Kishb (volcanic field), Saudi Arabia. 3. Emerald and amazonite, Wadi Sikait, Wadi El Gemal area, Egypt. 4. Low-grade emerald (beryl), Wadi Ghazala, Sinai Peninsula, Egypt. 5, Amethyst, Aswan area, Eastern Desert, Egypt. Photo: Khedr et al
The researchers used three types of spectroscopy to identify elements that influence colour, differentiating stones found in and outside the region, and distinguishing between natural and synthetic gems.
The iron content, for instance, correlates to the purple in amethysts, while elements such as copper, chromium and vanadium play significant roles in colour.
A unique water peak is present in lab-grown synthetic gems, distinguishing them from their natural counterparts, despite their otherwise identical appearance.
Royal crowns in Europe are decorated with peculiar gemstones that originate from either Africa or Asia
Adel Surour, study author
The crystalline structure of amazonite beads also highlighted differences among those from Mexico, Jordan and Egypt.
“We need to have precise methods to distinguish the source of a gemstone and trace ancient trade routes to have accurate information about the original place from which it was mined,” Mr Surour said.
Not only is the study the first to successfully distinguish certain silicate gemstones – peridot, beryl/emerald, amazonite and amethyst – originating from ancient Egyptian mines using molecular and elemental spectroscopic methods, but it also characterises gems from Saudi Arabia.
Beyond geology and archaeology, the study's implications could be crucial to the gem industry itself.
The ability to differentiate natural gems from synthetics and accurately determine their origins could lead to better authenticity checks and regulations, researchers said.
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"They see their tomorrows slipping out of their reach. And though it seems to them that everything outside this reality is heaven, yet they do not want to go to that heaven. They stay, because they are afflicted with hope." - Mahmoud Darwish, to attendees of the Palestine Festival of Literature, 2008
His life in brief: Born in a village near Galilee, he lived in exile for most of his life and started writing poetry after high school. He was arrested several times by Israel for what were deemed to be inciteful poems. Most of his work focused on the love and yearning for his homeland, and he was regarded the Palestinian poet of resistance. Over the course of his life, he published more than 30 poetry collections and books of prose, with his work translated into more than 20 languages. Many of his poems were set to music by Arab composers, most significantly Marcel Khalife. Darwish died on August 9, 2008 after undergoing heart surgery in the United States. He was later buried in Ramallah where a shrine was erected in his honour.
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As per the document, there are six filing options, including choosing to report on a realisation basis and transitional rules for pre-tax period gains or losses.
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Larger entities have specific provisions for asset and liability movements, business restructuring, and handling foreign permanent establishments.
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One showed 28 per cent of female students at a Dubai university reported symptoms linked to depression. Another in Al Ain found 22.2 per cent of students had depressive symptoms - five times the global average.
It said the country has made strides to address mental health problems but said: “Our review highlights the overall prevalence of depressive symptoms and depression, which may long have been overlooked."
Prof Samir Al Adawi, of the department of behavioural medicine at Sultan Qaboos University in Oman, who was not involved in the study but is a recognised expert in the Gulf, said how mental health is discussed varies significantly between cultures and nationalities.
“The problem we have in the Gulf is the cross-cultural differences and how people articulate emotional distress," said Prof Al Adawi.
“Someone will say that I have physical complaints rather than emotional complaints. This is the major problem with any discussion around depression."
Daniel Bardsley
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