saphire
Stone for stone, a diamond will cost more than a sapphire.
Chocolate diamond rings are slightly less expensive that normal diamond rings so are a good option if you are looking to propose on a budget. The cheapest available are å£55 though you can pay in excess of å£7000 for a large stone with an expensive cut.
The value of two diamonds of the same cut, carat weight and clarity with the only difference being that one is clear and one is black would be judged this way: the black diamond would be the less expensive stone.
Cubic zirconia rings are much less expensive than diamond rings. A cubic zirconia ring may cost around $700 while a diamond ring can cost upwards of $40,000. Cubic zirconia is a much less valuable stone than diamond is and cubic zirconia rings are priced as such.
A diamond is valued by its cut, clarity, carat weight and colour. A local jeweler can look at your stone and give you a precise answer.AddedBrown diamonds are less expensive compared to white diamonds. One half to one-tenth of the price of a 'white' diamond.
Magnesium I guess
it's not glittery if you mean shiny it'a the same
The diamond you want will be an extremely rare diamond, based on the desired weight. Here's an example of a sizable pink diamond: The Graff Pink, purchased at auction in November 2010 weighs 24.78 carats, a little larger than the one you want to buy. The buyer paid "... US $46 million (£29 million), making it the most expensive single jewel ever sold at auction."* You would pay less, given that you want to buy a less weighty stone. As well, you could compromise on clarity, and colour and save money. You can read more about the Graff Pink, below. *Wikipedia
Every diamond is valued by its clarity, colour, carat weight and cut. Compared on an equal basis, you will pay less for a black diamond.
sapphires are not near as strong, but much less expensive
Since every diamond is a unique stone, every diamond is priced according to its unique characteristics: cut, colour, carat weight and clarity. You pay less for more flawed, more yellow and poorly-cut diamonds. There's really no way to rank diamond cut by price. However, some fancy diamonds are priced by auctioneers by carat weight: per carat given the higher-than-one-carat weight of the fancy stone. In this scheme, bidders usually pay the most for natural blue diamonds, regardless of the cut.
Every diamond is priced by its cut, clarity, colour and carat weight. A chocolate diamond will probably cost you less than a similar stone without colour. However, you can spend thousands on a chocolate diamond, especially if you buy a large stone of unusual clarity.