This is a semi-precious synthetic blue sapphire and cz diamond ring on a gold plated band which I purchased from Aliexpress.com for £2.73. This was purchased about 4 months ago and still looks really nice. The blue stone is quite large, so could not be used as a set (unless you have fingers like Spock!) with a band but stills looks stunning on it’s own.
These photos don’t really do this ring justice as it really does sparkle in the sunlight.The large blue stone is held in place with the four corner holders, which are silver plated. Each side of that stone are two levels of CZ chips.
Similar rings can be purchased from http://aliexpress.com