I BELIEVE it's part of the soleste collection (if you search "soleste" on the Tiffany website, the round diamond halo studs and pendant come up!)
I saw this collection before I saw the yellow diamond collection. I ALMOST got a 1.70 (or was it 1.90? My memory is a little spotty here) carat tanzanite for $5600.

What a deal, what a steal! I wanted it so badly I asked my DF (then DBF) for it as an e-ring, but he wasn't into gemstone rings. He felt gemstones just don't have the brilliance, fire, and sparkle that diamonds do, but this ring is AMAZING. I almost want to get a round one as a RHR but it would look funny having two solestes!!
You should TOTALLY GET IT!! Either as RHR OR an e-ring!!