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17-Jun-2016
There are a wide range of gemstones used in jewellery, with each having its own characteristic colour – or, in some cases, a range of colours. The origin of these colours has a chemical basis, and the precise colour can vary depending on the chemical composition of the gemstone. Interestingly, many minerals are actually colourless in their pure form, and it is the inclusion of impurities in their structure which leads to their colouration.
Generally speaking, we observe an object as coloured when it absorbs some wavelengths of visible light, but not others. Different colours of light have different wavelengths, so the exact wavelengths that are absorbed will affect the colour that the object appears. For example, an object that absorbs all wavelengths of visible light that pass through it, but does not absorb red light, will appear red.
2018’s biggest science stories
As we head into 2019, it’s time to take a look back at some of the biggest science news stories over the past year. This year’s science news featured water on Mars, the effects of e-cigarettes, new types of isomerism and bonding, and more! 2018 saw a number of significant discoveries in sci ... more
Unleashing our immune systems against cancer
The first of the 2018 Nobel Prizes is awarded. The 2018 Nobel Prize in Physiology or Medicine was awarded to James P. Allison and Tasuku Honjo for their discovery of cancer therapy by stimulating the immune system to attack tumour cells. This graphic takes a look at the prize-winning research. more
The creation of tools made from laser light
After the Nobel Prize for Physiology or Medicine has been awarded, it is physics' turn. The 2018 Nobel Prize in Physics was awarded to Arthur Ashkin, Gérard Morou and Donna Strickland for their pioneering innovations in the field of laser physics. Strickland is only the third woman to recei ... more
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