The birthstone for May is the Emerald, a type of beryl, available as both a precious and semi-precious stone. The precious gemstone emerald is a rich glowing transparent green, the deeper the colour (and the more transparent) the more highly prized the stone. So beautiful is the stone it has given its name to the particular shade of green.
Its chemical composition is aluminium beryllium silicate, the colouring agent for true emeralds is chrome (other green beryls are coloured with vanadium, and should not be called emerald, but instead “green beryl”). It is mined in Colombia, Brazil, Zimbabwe, and many other countries around the world.
Semi-precious emeralds are clouded by inclusions, and may vary from pale to dark green. These are the type of emerald you will find in the Granary Knits Etsy store, in the form of earrings using selected shaded chips.
There are many large and well-known emeralds, mostly held in museums around the world, including the Natural History Museum in London, the American Museum of Natural History in New York, and the Topkapi Palace in Istanbul.