Tear of the Goddess is 45.75% gold efficient at no 0 mana charge.
Tear of the Goddess is 183.01% gold efficient when fully stacked.
Because of Awe's mana refund, Tear of the Goddess' efficiency is further increased by 1.83% for every 100 mana obtained from other sources, and by 6.54% for every 100% mana regeneration obtained from other sources.
Few are fortunate enough to come across the tears of the very goddess who created our world... but those who are lucky enough to acquire a Tear of the Goddess may take pleasure in a significant boost of mana points and mana points regeneration.
When gaining maximum mana from Mana Charge, you preserves your percent current mana.
Selling Tear of the Goddess and its upgrades removes the bonus mana. There is a small window of time during which Tear of the Goddess or related items can be re-bought while still retaining the bonus mana stacks. In addition, while any Tear of the Goddess or related item is held, the bonus mana stacks are retained, even if the original item used to gain the stacks is sold.
Mana Charge on Tear of the Goddess requires mana expenditure in order to charge, making it impossible for manaless champions to charge it.
It is a good item for champions with abilities that have an upkeep cost like Anivia or Singed.
Using abilities at the fountain can be used to charge the passive while mana is quickly regained. Fiddlesticks is the only champion in the game who is unable to charge Tear of the Goddess without an enemy target (factoring only basic abilities).
Tear of the Goddess combines excellently with champions with spammable abilities or abilities with low costs that constantly consume mana (e.g. Singed'sPoison Trail or Karthus'Lay Waste), ideally bringing a fully filled Tear of the Goddess at the 20 minute mark.
Assuming a charge is gained every 4 seconds, the 750 mana charge takes 12 minutes and 30 seconds to max.