This Kialara sold at auction to you for less than 0.5 BTC not very long ago... there's a reason for that, and sadly it boils down to the fact that prices have decreased to the point where a figure we might have considered absurd last year is now the norm today.

Good luck with your sale, but I sincerely doubt that anyone is going to pay more than 0.6 BTC for it. Prices are not what they were.