Deledrius might not have been too precise on that particular point but in
Gehn shard, there's only 1 sparkly available at a time. Since February 1st, the only sparkly available should be in Kadish Tolesa.
Sparkly by month:
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January: Gahreesen
February: Kadish Tolesa
March: Eder Gira
April: Gahreesen Prison
May: Descent
June: Minkata
July: Er'cana
August: Jalak Dador
September: Teledahn
October: Phil's Relto
November: Great Zero
December: Myst Island Library