Gambling Rules

[Jibboo]

I know I've read somewhere but have forgotten where that there is some formula for the minimal level in order to get certain items off of Gambling.
Also can you get uniques off of gambling?

[Hrus]

Item levels are determined by an equation:
ilvl = clvl + rnd[10] - 5
(i.e. from clvl-5 to clvl+4)

The chances for every quality are:
Unique: 1/2000
Set: 1/1000
Rare: 1/10
Magical: 1797/2000
..........