Unlike most modern 'silver' coins, this coin from the Netherlands is made of, er, silver. What a rarity! The coin is not rare, but the fact that is is made of silver is very rare. Just about all countries in the world abandoned real precious metal in their regular circulating coinage during the mid 1960s. But the Netherlands maintained actual precious metal content in some of their regular coins, and this is an example.
This coin with Queen Juliana contains 0.577 troy ounces of silver. At today's silver value, around $28 US dollars per ounce, the value of this coin is 0.577 x 28 = $16 US dollars. Tomorrow the value will be different, because the price of silver changes every day. Look it up on web sites such as kitco.com.
This coin is worth its silver value. If you have a fully uncirculated example, you can add a US dollar or two to the silver value.
Since Wemie's coin is mounted in jewelry, it is not a collectible coin; it is a piece of jewelry. There could be value added by the silver in the jewelry. The place to find out is a jewelry store, where the proprietor can give you an appraisal.