Use different "Surface" function to build up your jewelry.
"Profile Sweep"
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Use two curve to build the surface
"Heightfield from Image"
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Surface with control points at sample locations
"Blend"
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Adjust Surface Blend
"Fillet"
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Rounded edge
"Pull Push"
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Edit the depth from curve
"Drape"
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Drag a window over area to drape, creating meshes