You’re probably referring to one of a few “high-value” plant saps, because that phrase gets used for different ones depending on context.
The most famous “worth its weight in gold” sap/resin is frankincense resin from Boswellia trees. It was historically traded like a precious commodity—used in incense, perfumes, and traditional medicine across the Middle East and South Asia.
Another strong candidate is myrrh, also a resin, similarly valuable in ancient trade and still used in some medicines and fragrances.
If you meant something more modern and practical, people also say it about:
- Maple sap (for maple syrup production—lots of sap turns into very little syrup, so the value concentrates)
- Aloe vera gel/sap (valued for skin and burns, though not literally “gold-level” in price)
- Birch sap (popular in some countries as a health drink)
If you tell me where you heard it or what plant you’re thinking of, I can pin it down exactly.
