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[Virex]

Diamond has an adamantane structure, which is quite different from the polycyclic structure of graphene.

[Nadaka]

its a carbon with a strong and unique structure, close enough, plus the wife will like it.

[Starver]

bit of topic, but any SCIENCE!! related ring needs to incorporate aluminium somehow.

Spoiler: A keyboard?  How quaint... (click to show/hide)

(However, see also this fiction-made-flesh...)

[Graebeard]

Diamonds are, in fact, pretty cool.  Particularly artificial ones for an untold number of reasons.  But I'm not considering them for two simple reasons: we want bands rather than something with a central gemstone, and using diamonds is old.  I want something a bit more bleeding edge.

I think she'd be into it, too.  She's certainly not your stereotypical "diamonds are a girl's best friend" kind of girl.

[Starver]

I want something a bit more bleeding edge.

Sounds dangerous...  Serrated glass disk, mayhap?

[Virex]

If you want bleeding edge, it's hard to pass up on Tungsten Carbide.

[Sensei]

Tungsten carbide always occupied my mind as "stuff used in expensive drill bits". I'll omit a pun about bleeding edges, but it just doesn't seem jewelry-like enough, and though expensive, not quite exotic enough either.

[Graebeard]

maybe just wedge a spike through the ring when you put it on her finger?

This is a graphene wedding ring.  All craftsdwarfship is of the highest quality.  It menaces with spikes of steel.  On the item is an image of Graebeard a female female human.  Graebeard is proposing.  The female human is screaming.

[Armok]

when we're brainstorming about general cool ring-applicable stuff, getting some nanoscale etchings on it with photolithography or somehting.

[alway]

bit of topic, but any SCIENCE!! related ring needs to incorporate aluminium somehow.

Spoiler: A keyboard?  How quaint... (click to show/hide)

(However, see also this fiction-made-flesh...)

Actually, you could do transparent aluminium. We have that now.
http://en.wikipedia.org/wiki/Aluminium_oxynitride

When formed and polished as a window, the material currently (2005) costs about US$10 to US$15 per square inch

It may be a bit difficult to find a supplier willing to work out how to make a ring-shape, but the material itself is relatively inexpensive (though that may or may not be a good thing when it comes to making a wedding ring ). Though it may be a bit tacky if your significant other isn't a trekkie.

[Starver]

Spoiler: A keyboard?  How quaint... (click to show/hide)

(However, see also this fiction-made-flesh...)

Actually, you could do transparent aluminium. We have that now.
http://en.wikipedia.org/wiki/Aluminium_oxynitride

Actually, you missed the exact same URL being linked in the spoiler area, just below the image.

Also, there's (as I confirmed, when looking for the more regular kind of "Transparent Alum[in]ium") information also about "Aluminium made transparent (to UV, at least) by knocking out an electron from every atom in a sample, using an extremely powerful laser".  But this "new form of matter" might not be easy to make and wear as jewellery.  You'd need that laser, for a start!