Black Sapphires - Diamonds

[Oriaas]

Both now stack to 100 according to Lucy.

I can't confirm the stacksize of 100 as I only have 50 black sapphs and 56 diamonds atm. They do stack greater than 20 though.

Blue Diamonds and Jacinths still stack to 20.

[Kahmon]

I can confirm Emeralds & Pearls stack to 100 as well now.

[Shadrok]

Aye

I have:
Diamonds to 84
Black Sapphires at 55
Black Pearls at 22

My 103 Blue Diamonds only stack in 20s.

[Ashwith]

Thanks for the submissions, all.

These stack sizes have all been updated in the database now.
I'm working on the rest of the gems as we speak.

Data Submission Tip of the Moment:
One way to check how many items you can stack is to find the item on an NPC vendor and click the 'Buy' button. The slider will tell you how many are in a stack, and you can cancel the purchase before spending a dime.

Of course, this doesn't work well if you can't find the item on a vendor, aren't willing to sell an item, don't want to risk vendor mark up, don't want to risk an item disappearing into the vendors inventory, or the item isn't droppable.

In short: it's a useful trick for vendor bought items or items that are frequently sold to NPCs. It's not necessarily wise to risk your items this way just to find out a stack size. Unless you're a hardcore crazy number fish like...

Data Trout