Czech Crystal is also made from glass. Not as common as the other two, but similar to Austrian Crystal. This would most likely be the cheapest, but also not as valued as the Swarovski.
Zirconium Oxide or (Cubic Zirconia) is the number one synthetic version of Diamond used as its substitute. It's somewhat heavier than diamond and it is man-made. This would be the most expensive of the three. Less than the price of diamond and sometimes a great deal less for the value, while also looking as close to diamond as you can get.