Jeweled Amulet
Artifact
, 
: Put a charge counter on this artifact. Note the type of mana spent to pay this activation cost. Activate only if there are no charge counters on this artifact.
, Remove a charge counter from this artifact: Add one mana of this artifact's last noted type.
Dan Frazier
Masters Edition II (ME2)
• #212Rulings
The types of mana are white, blue, black, red, green, and colorless.
(wotc • 2008-10-01)
Charge counters are indistinguishable from one another. If some other spell or ability (such as Power Conduit’s ability) puts a charge counter on Jeweled Amulet, activating Jeweled Amulet’s second ability will still check the type of mana last noted by its first ability. If there is no type of mana noted by its first ability (because it hasn’t been activated by that point), the second ability will produce no mana.
(wotc • 2008-10-01)
Rulings
The types of mana are white, blue, black, red, green, and colorless.
(wotc • 2008-10-01)
Charge counters are indistinguishable from one another. If some other spell or ability (such as Power Conduit’s ability) puts a charge counter on Jeweled Amulet, activating Jeweled Amulet’s second ability will still check the type of mana last noted by its first ability. If there is no type of mana noted by its first ability (because it hasn’t been activated by that point), the second ability will produce no mana.
(wotc • 2008-10-01)