Hello, welcome to CDI!
It's a pretty ring. What makes you think the stone is a red diamond - irradiated or otherwise? It looks more like a ruby or spinel to me (though ID from a photo is always a guess at best).
The best way to post pictures is to use [*img]URL[*/img] tags (without the *) by uploading full-size pictures to a web hosting site (be it Facebook, Picasa, your own web site or anything else that enables you to store files) and linking them via their URL to the post.
Value - in what sense? You determined the value as a pawn yourself. Resale value to the public depends on correct ID (including accurate determination of hue), and also to a large extent on how long you want to keep it there for... nice irradiated reds around 0.70 ct. can be offered for $4-5 thousands/carat; whether they sell... is a completely different question.