Jeweled Amulet 
Artifact
{1}, {T}: 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.
{T}, Remove a charge counter from this artifact: Add one mana of this artifact's last noted type.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Magistrate's Scepter 95%
$3.42#5640
"{4}, {T}: Put a charge counter on this artifact."
+1 more matching line
Conversion Chamber 93%
$0.10#23220
"{2}, {T}, Remove a charge counter from this artifact: Create a 3/3 colorless Phyrexian Golem artifact creature token."
Ice Cauldron 91%
#24360
"{T}, Remove a charge counter from this artifact: Add this artifact's last noted type and amount of mana. Spend this mana only to cast the last card exiled with this artifact."
+1 more matching line
Empowered Autogenerator 90%
$0.30#4112
"{T}: Put a charge counter on this artifact. Add X mana of any one color, where X is the number of charge counters on this artifact."
Surge Node 88%
$0.36#17588
"{1}, {T}, Remove a charge counter from this artifact: Put a charge counter on target artifact."
+1 more matching line
Trigon of Infestation 87%
$0.21#22876
"{2}, {T}, Remove a charge counter from this artifact: Create a 1/1 green Phyrexian Insect creature token with infect."
+1 more matching line
Trigon of Thought 84%
$0.09#29056
"{2}, {T}, Remove a charge counter from this artifact: Draw a card."
+1 more matching line