Please join our new sister site dedicated to discussion of gold, silver, platinum, copper and palladium bar, coin, jewelry collecting/investing/storing/selling/buying. It would be greatly appreciated if you joined and help add a few new topics for new people to engage in.
Probably between $25 and $2,500,000. You can easily look that up on the web.
I really don't think that members could be expected to provide a worthwhile valuation based on just an image. Is it a ruby or a bit of red glass, who can tell?
If you genuinely want a valuation, take it to a jeweler or someone who could physically inspect it.
Please understand that Prospecting Australia isn't a website for buying/selling gemstones. Somebody here may be able to give you an indication of value, but the only realistic way that any stone can be valued is by first-hand expert examination.
The expert would utilise a bright light and a lens to determine clarity, inclusions and flaws, as well as testing to ensure that the stone has been correctly identified, using hardness tests, specific gravity calculation and UV inspection, etc.