This is an interesting conundrum and conversation, so I'm wading in a bit deeper with the disclaimer that I'm writing solely from my POV as a potential consumer looking at the uber-closeup photos.
Even if this diamond were to be set, as I see it now, it's not something I envision myself purchasing either loose or as a ring – and I generally have a soft spot for big brownish diamonds, especially when they're priced well. However, I admit to liking clean stones over high-color stones and sometimes pure-color stones, so there's the trade-off. Certainly, other folks may come at the equation from the other side.
Large or not, this diamond is still drastically flawed. And thanks to decades of diamond industry marketing, a good part of what consumers expect and pay for in diamond gems is their "exceptionalism" – those combined qualities which make the gemstones unique and beautiful, or "precious." In this case, the critical cracks in this stone have, quite literally, chipped away at the diamond's exceptionalism.
Honestly, it would be near-impossible for any critically flawed diamond, regardless of size, to meet my expectation of a desirous, precious gemstone. However, again, that's just me. Someone else may think this is a steal at, let's say, $5K maybe even $10K, and they'd be happy to go with it.
Also, if this were a fancy pink or yellow, without modifiers, I think it might attract more potential buyers and you might get away with a bigger price tag.
Still, I'm curious to see a photo of what this stone looks like from a normal perspective. It might become more of a temptation. Moreover, there may very well be an opportunity for an interesting, unique piece of jewelry. Again, a pendant, or perhaps, a gold bangle (yes, the gold would certainly be pricey) set with many stones, this being just one of several. If one insists on a ring, maybe there is something one can do to confuse the eye (perhaps, setting in all-gold would help?). Regardless, in each case, you're still spending "extra" to try to camouflage the problem.
One final consideration (not from a consumer POV): once the stone is set into jewelry with a DBL stamp on it and it's "out there" on someone's finger or around someone's neck or wrist, it becomes an "ambassador," so to speak, for DBL. Once set, can this stone live up to the DBL hallmark?