It always depends on the buyer (not the seller perse ) but I'd estimate this on 1.5 to 2 million easily. For the very simple fact that this item is basically non-existent in the game. And that means that once it does show people will flock to it. I've seen as much in a recent auction which a friend of mine held, that went pretty out of control pretty fast. So if you put this up for an auction... Yah, my estimate is that it'll reach 2 million easily. Warning though: if you're looking for ways to "liquidize" your IRL currency then I wouldn't bet on this voucher but instead go for the "6 dia for $100" instead. One dia voucher goes for approx. 600k - 700k. Lets say 650k for the heck of it. Now, times six makes: 3,900,000. A "little" more Hope this helps!
Well, I saw someone selling diamond vouchers for 350k, and I know I thought "Wow that's cheap..." So I think it is around 400k per or so. Just multiply that by five. 1.75 M. I remember when I bought my diamond voucher from someone in December 2014, I payed 200k for it and that turned out to be a ripoff. =P
Diamond Vouchers have been going for 315-350k now, they're decreasing I've seen those sorts of prices in stock on forums over the past few days I think the vouchers are ball park between 1 and 2 mil, simply due to their rarity, not many people buy them, and when they do, they tend to use them rather than sell them in-game