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What is a JCD file?
A JCD file is a 3D jewelry design created by JewelCAD, a computer-assisted jewelry design program. It contains a digital mock-up of a piece of jewelry. JCD files can be opened only in JewelCAD.
Jewelry designers can use JewelCAD to produce 3D prototypes of pieces of jewelry. These prototypes are saved in JCD files.
After a designer has finished creating a prototype, they can export their jewelry design as an .STL file. Jewelry machining and manufacturing facilities can use the STL file to turn the designer's prototype into a real piece of jewelry.
How to open a JCD file
You can open a JCD file in JewelCAD (Windows). Additionally, you can use JewelCAD to export your JCD file as an STL file. To export a JCD file as an STL file, select Misc → Cut in Slices → Also Output STL file.