Sweet Gem Berry is a crop in Stardew Valley. It can be grown during the Fall and take 24 days to mature. They sell through the shipping container for No Star: 3000g, Silver: 3750g, Gold: 4500g each. They cannot be used in the Preserve Bin or Keg.
If you trade the Sweet Gem Berry to the statue located far West of the Secret Forest, you will receive a Stardrop. You can only do this action once.
The seed for this crop is frequently sold by the Traveling Merchant