Aquamarine is the blue or cyan variety of the naturally occurring mineral beryl. It is mainly found in the Sawatch Mountain Range in Colorado and in a few south American countries such as Brazil. It is associated with calmness at sea and believed to enhance happiness in marriages. The colour of Aquamarine varies among different shades of green and blue. As a gemstone, it is relatively durable but care must be taken to prevent cracks and weathering.