Produce Quality
In Coral Island, there are five different quality levels for crops and animal food: Basic, Bronze, Silver, Gold, and Osmium. To increase the quality of an item, player can upgrade these items in Ling's Lab using various kelp essences they obtain from diving. By doing so, players can improve the yield and quality of their harvest, leading to greater success in the game.
Quality can have various effects. Higher quality items generally come at a higher price. For some consumables, higher quality also results in greater stamina and HP recovery. During festivals like the Harvest Competition and Potluck, higher quality grants more points.
Items available to upgrade :
- Crop Seed : Increase quality of harvested crops
- Fruit plant seedlings : Increase quality of fruit plant harvest
- Fruit trees saplings : Increase quality of fruit tree harvest
- Hay (Animal food) : Increase quality of animal products
Ling's Lab
To upgrade items in Coral Island, players can visit Ling's Lab. The kelp essences required for each upgrade will vary depending on the item being upgraded and the quality level being targeted.
| Upgrade | Quality | Time | Gold Cost | Requirement | |
|---|---|---|---|---|---|
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2 Days | 2,000 
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2 Days | 5,000
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2 Days | 10,000
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2 Days | 20,000
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2 Days | 2,000
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2 Days | 5,000
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2 Days | 10,000
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2 Days | 20,000
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2 Days | 2,000
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2 Days | 5,000
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2 Days | 10,000
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2 Days | 20,000
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2 Days | 2,000
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2 Days | 5,000
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2 Days | 10,000
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2 Days | 20,000
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Quality mechanic
Product quality is determined when the player harvests the product, not when they plant the seeds. However, the quality of the seed affects the chances of getting a certain quality when harvesting. By upgrading the seed, the player increases the chances of getting upgraded crops.
For example, if the seed is basic quality, the player has a 90% chance of harvesting a basic crop and 0% chance of getting a gold or osmium crop. But if the player upgrades to a bronze seed, the chances of getting a bronze crop increase to 55%, while the chances of getting a basic crop are reduced to 30%, and there is now a 3% chance of getting a gold crop.
The table below shows the complete percentage chance of what product the player will get:
| Basic Upgrade to Produce Percentage | Basic Quality | Bronze Upgrade | Silver Upgrade | Gold Upgrade | Osmium Upgrade |
|---|---|---|---|---|---|
| Produce Basic | 90% | 30% | 10% | 0% | 0% |
| Produce Bronze | 8% | 55% | 20% | 10% | 0% |
| Produce Silver | 2% | 12% | 55% | 20% | 5% |
| Produce Gold | 0% | 3% | 13% | 55% | 40% |
| Produce Osmium | 0% | 0% | 2% | 15% | 55% |
This chance can further be improved with quality crop mastery skill and fertilizer.