One of which would be the Lapis Lazuli which is a semi-precious stone that has been used since ancient times. You could try to consider the that have been used during the times of ancient Egypt. They used both the Lapis Lazuli and the blue glass in ornamenting and embellishing different things. This semi-precious stone is generally a "massive" gemstone, which means that it is not made of clear crystals but is made from tiny particles that have been bonded together.

Probably the best deep purple blue gemstone can be found in Afghanistan and is extremely close to the blue of the ocean. Just recently, there has been a form called 'denim lapis' which has been offered; however, this is actually the grayish light blue element that has been rejected due to its poor quality several years ago.

The more a lapis varies from being of a pure dark blue color, the lower its value. The term "denim lapis" has actually been a marketing term which used to sell the stone. Now although it is a lot less expensive compared to the ones with higher grade, the combination of the nice "denim" material actually works well in the more expensive pieces of and is quite attractive.