das Goldstück
gold coin
A coin made of gold. It can serve as a means of payment, a collector's item, or an investment.
In der Schatztruhe fanden sie mehrere alte Goldstücke.
In the treasure chest, they found several old gold coins.

gold piece / treasure
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gold coin
A coin made of gold. It can serve as a means of payment, a collector's item, or an investment.
In der Schatztruhe fanden sie mehrere alte Goldstücke.
In the treasure chest, they found several old gold coins.

The word is simply made up of 'Gold' (gold) and 'Stück' (piece). So it literally means 'a piece made of gold.'
Er brach ein kleines Stück von der Schokolade ab.
He broke off a small piece of the chocolate.
You can recognize the figurative meaning by the fact that someone is talking about a person. The literal meaning always refers to the metal gold, often in the context of treasures, money, or geology.
Der Pirat zählte seine Goldstücke.
The pirate counted his gold coins.
In connection with coins, 'Goldstück' (gold coin) is often used with verbs like 'finden' (to find), 'sammeln' (to collect), or 'prägen' (to mint). It frequently appears in stories about pirates, treasures, or in historical contexts.
Der Archäologe hat ein seltenes römisches Goldstück entdeckt.
The archaeologist discovered a rare Roman gold coin.
As an affectionate term, 'Goldstück' (treasure) is often used as a direct compliment to express gratitude or affection. It is a very warm way to praise someone.
Du hast an meinen Geburtstag gedacht? Du bist einfach ein Goldstück!
You remembered my birthday? You're simply a treasure!
angel
'Engel' and 'Goldstück' can both be used affectionately for a particularly kind or helpful person. 'Engel' often emphasizes that someone is very good, kind, or helps in a saving or rescuing way. 'Goldstück' tends to emphasize that someone is very valuable and dear, for example in the family or in everyday life. The words can be confused because both express praise. 'Engel' sometimes sounds a bit stronger or more emotional, while 'Goldstück' often sounds warm and appreciative.

Unsere neue Kollegin ist ein echtes Goldstück und hilft allen im Team.
Our new colleague is a real treasure and helps everyone on the team.
Du bist ein Engel, dass du mir so spät noch die Medikamente bringst.
You're an angel for bringing me the medicine so late.