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In page Bronze Age:

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The Dabene Treasure was unearthed from 2004 to 2007 near Karlovo in central Bulgaria. The treasure consists of 20,000 gold jewellery items from 18 to 23 carats. The most important of them was a dagger made of gold and platinum with an unusual edge. The treasure was dated to the end of the 3rd millennium BC. Scientists suggest that the Karlovo valley used to be a major crafts centre that exported golden jewellery across Europe. It is considered one of the largest prehistoric golden treasures in the world.[citation needed]