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Not thee, but a local custom jeweler. The metal sprues and vents remain after the casting is done and the object is removed.
Seen here, the blue structure is the sprue system, prior to casting. From...

Most jewelers who investment cast ornaments, will have the vent sprues after the casting process. These would usually be about 1-1.6mm in diameter and perhaps 2cm long. They would, along with the...

Hi Bruno,
I would suggest that you contact Jewellery Supply houses. for rod, and flat stock plus other findings.
Here a two that I trust, from years of service, here in the USA:
Jewelry Tools |...