Rare Seeds can be purchased from the Traveling Cart for data-sort-value="1000">1,000g in Spring & Summer, or for data-sort-value="200"600–1,000g in any season. Rare Seeds can also be produced from a Sweet Gem Berry using the Seed Maker.
Despite its high value, the berry is regarded as a neutral gift by everyone in Stardew Valley. However, gifting one to Old Master Cannoli in the Secret Woods will result in the player getting a Stardrop in return, which increases maximum energy permanently.. In multiplayer, only one berry needs to be given for all players to receive a Stardrop.