das Juwel
jewel
A valuable, cut and polished gemstone that is often set in jewelry.
Die Krone war mit zahlreichen funkelnden Juwelen besetzt.
The crown was set with numerous sparkling jewels.

jewel / gem
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jewel
A valuable, cut and polished gemstone that is often set in jewelry.
Die Krone war mit zahlreichen funkelnden Juwelen besetzt.
The crown was set with numerous sparkling jewels.

In its literal meaning, 'Juwel' (jewel) is often combined with verbs like 'funkeln' (to sparkle) or adjectives like 'wertvoll' (valuable). A typical phrase is also that something is 'mit Juwelen besetzt' (set with jewels).
Der Ring war mit einem großen, wertvollen Juwel besetzt.
The ring was set with a large, valuable jewel.
'Juwel' (jewel/gem) is very often used figuratively for something especially beautiful, good, or valuable. It expresses high appreciation.
Dieses historische Gebäude ist ein architektonisches Juwel.
This historic building is an architectural gem.
You can recognize the figurative meaning by the fact that the word does not refer to a gemstone, but to a place, a building, a work of art, or even a person.
Der kleine Park mitten in der Stadt ist ein verborgenes Juwel.
The small park in the middle of the city is a hidden gem.
gold
'das Gold' and 'das Juwel' are both connected with value, jewelry, and beauty. 'Gold' mainly means the precious metal or something that is very valuable. 'Juwel' means a valuable gemstone, often set in a piece of jewelry. Figuratively, 'Juwel' can also refer to an especially beautiful or unique person or thing. 'Gold' tends to emphasize material or great value, while 'Juwel' emphasizes something rare, special, and admired.

Der kleine Garten hinter dem Haus ist ein echtes Juwel.
The small garden behind the house is a real gem.
Viele Menschen kaufen Gold, weil sie ihr Geld sicher anlegen wollen.
Many people buy gold because they want to invest their money safely.