Since very long time I had a suspicion that something strange is going on with the Blackie pearl conversion rate. Today I’ve got the proof.
The pearls you get for melting items are always whole natural numbers. Never fractions. Therefore, if you get a 1 pearl worth item, and your blackie workshop gives you 100% pearls conversion, you should get 1 pearl. For 200% you get 2 pearls, for 300% you get 3 pearls.
I have 6 Blackie slots now. This is a total 300% pearls conversion. There fore the following pearl worth items should apply for me:
1 pearl original value x300% = 3 pearls
2 pearl original value x300% = 6 pearls
3 pearl original value x300% = 9 pearls etc.
Please note, that with this 300% conversion rate, 1,2,4,5,7,8 final pearls value is impossible, because they are not multiplies of 3. Special attention is needed for 1 and 2 final pearl value, cause they are impossible to get. My minimal pearl value can’t be less than 3 for 6 slots (300%).
Attached screenshots:

My Blackie workshop, showing clearly 300% conversion rate.

Item Showing a 2 pearls worth item in my warehouse.

Items showing 4,5,7,13 and 14 pearls value. Impossible as well, cause they all are not multiples of 3.
As said before, pearls original value is always a natural whole number. No fractions. Therefore, after the multiplications they must be only multiples of 3, i.e. 3, 6, 9, 12, 15 etc.
Therefore, it is my belief that Flares are cheating on all the players and giving less pearls than should be by your Blackie slots amount. You pay unbelievable sums of gems for additional slots and get cheated… lol.
Happy new Year,
Edward