I reckon you should give that a shot in the for sale section.
You never know! Some people have been selling some gemstones and from what i've seen they've moved pretty well.
Also, did you post your ad in the US/North America for sale forum?
I think I recall seeing it in the Aussie section.
Might get better luck over there unless you can ship down under. Perhaps something to consider with your gemstone?
i have over 15k in gems but its hard to find buyers right now, most people are shelling up for a potential crash again or just recovering from the last one. if any of yall have the slightest interest in investing in ay kind of gems hit me up