you have to enter the lottery its new on howrse if you are talking about the horse pearl
The Black Pearl
pride
By the Jade horse
Buy it or win it in one of the monthly competitions
You cannot sell Pearl, but you can sell: Sleipnir Xanthos Balios Croesus Gypse Falabella Archie Harliquin and I think a few more can be sold. Sources: Over 140 days of experiance on Howrse' PM me at tmh on International Howrse!
You need a black pearl, which is rarely available.
though HOP's (Horn of Plenty) which can be found in the "Black Market" on Howrse, open it in the luck of finding one. NOTE: You won't automatically find the gem horse, Howrse will tell you on the News Feed when they're in the HOP's. also, you can win them in contests Howrse does every month!
you win them in horns of plenty
As far as I know you can buy a black pearl.
no and no one cares
It states on the black pearl page no 3d images
There are no longer achievements on howrse.