Watch the two recordings that will get attached to this. When using [[Jeweled Amulet]] with [[Idyllic Beachfront]], I get asked which mana do I want to create and use for Amulet. However, if I instead use [[Celestial Colonnade]], then it picks automatically (usually U, although I think I've seen W once).
#Jeweled Amulet not asking on some dual lands which mana to use
vital crystal
gritty starBOT
Artifact
, 
: Put a charge counter on Jeweled Amulet. Note the type of mana spent to pay this activation cost. Activate only if there are no charge counters on Jeweled Amulet.
, Remove a charge counter from Jeweled Amulet: Add one mana of Jeweled Amulet's last noted type.
Land — Plains Island
(: Add 
or 
.)
Idyllic Beachfront enters the battlefield tapped.
In the tradition of the original Tolarian Academy, every Tolarian campus is built near a body of water.
Land
Celestial Colonnade enters the battlefield tapped.
: Add or .
: Until end of turn, Celestial Colonnade becomes a 4/4 white and blue Elemental creature with flying and vigilance. It's still a land.
vital crystal
turbid salmon
probably because the basic actually has two mana abilities instead of one, so the shard choice happens slightly different