It’s hard to answer your question because if you have added an image of the necklace I could be more easier to give you right answer. One thing is sure that in Croatia there are no 18k jewelers but only 14k. There is a so called traditional jeweler and you can visit these two links to find more info that might answer your question.
Traditional Dubrovnik jewelry is becoming extremely popular, and it recently received the "Croatian Creation" stamp of approval. The delicate pieces made of precious metals are hand-made in the traditional fashion of old artisans. The jewelry dates back to the golden years of Dubrovnik (1358-1526), when Dubrovnik became a free city-state and then Republic. The collection includes the most popular pieces, like this necklace made of golden grains called "peruzina" or our earrings known as "vezilice". The designer of Zlatarna Krizek (Krizek Jewelry Shop) was able to bring back to life the beauty of these old pieces and the whole collection has been awarded the "Authentically Croatian" Certificate. These pieces are not made from molds, but are entirely hand-made. The workmanship is just incredible!
