TOPIC: Ioun Stone - Topaz Trilliant

Does the Topaz +2 Stack with the Beryl +1 for saves?

yes. They do not have the same name, so they stack.

This is covered on page 10 of the Token Guide

Here is the entry:

For the purposes of TD game play all items with similar effects are permissible to be used together (e.g., armor, Ring of Protection, Spells, Potions, etc.). Equipping your character with identical items (i.e. two identical things) is not allowed (e.g., two +1 Rings of Protection). There are some exceptions to the stacking rules, which are noted in the descriptions of the individual tokens. Note: a +1 and +2 ring of protection do stack.
In addition things which occupy the same physical space (e.g., Gloves and Gauntlets) are not permitted unless there is specific allowance in the token’s description.[/i]