![]() On the other hand, sapphire is a much younger gem as it formed “only” around 150 million years ago. “The age of gemstones, from the time they were formed within the Earth, ranges from millions to billions of years.”įor instance, experts currently estimate that diamonds formed deep within the Earth’s mantle more than 3 billion years ago. (With the exception of organic gemstones like pearls which are formed constantly.)Īs carbon-, gas- and other scientific mineral dating techniques improve, scientists are able to determine the age of gemstones more exactly. The age of gemstones, from the time they were formed within the Earth, ranges from millions to billions of years. On the contrary, many semi-precious stones can fetch sky-high prices if they are of good quality and colour. This does not mean that they are not valuable. The four precious stones – diamond, sapphire, ruby and emeraldĪll other gemstones that are not classified as precious stones (above) are called semi-precious stones. In fact, there are only four gemstones that are called precious stones: diamond, sapphire, emerald and ruby. Precious stones are particularly rare and beautiful gemstones. That’s why we’ll focus on only some of the best-known ones here: As there are so many, we cannot cover them all in this article. There are around 200 different natural gemstones that we know about today. This enhances and brings out their shine and colour. After mining, however, they are carved and polished into specific shapes, called cuts, by expert lapidaries (gem cutters). These are irregular in shape and in some cases, not all that sparkly or beautiful. ![]() Gemstones naturally occur as “rough” stones. ![]() For instance, a physical process called “charge transfer”, as well as the presence of titanium and iron, are what produce the blue colour in sapphires. The difference in gemstone colours is based on the trace elements they contain, physical differences in the crystals, and the way they refract light. Where does the colour of gemstones come from? Gemstones appear naturally in all the colours of the rainbow, including colourless, white and black – with all shades of blues, greens, reds, yellows, browns, pinks and oranges in between. Gemstones colours are determined by trace minerals and light refraction While most gemstones are minerals and rocks that come from underground (such as emeralds and opals), some valuable organic materials like pearls and amber are used in jewellery and therefore also called gemstones. Throughout history, they have also been used to decorate a variety of other items like plates, combs, religious or ceremonial objects, and weapons. Gemstones are often used as decorative elements in jewellery and other adornments.
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