Diva Dahlia Tuber
Diva is lovely. A dark purple formal decorative that also can fit the bill for a dark red in certain palates. The color really reminds me of Ivanetti, just in a different form--the two work great together! The flowers are about 4-6 inches depending on where we are in the season, full, and dramatic. The plant is stately and strong. The stems are great for cutting, and overall, Diva is a flower I really enjoy--she'll stop you in your tracks! She's no particularly early, but not late either, and once they start blooming they're pretty productive.
I feel like my photos aren't doing it justice, so here's a google image search.