I am lucky enough to have access to a 3D printer. I wanted to use this to my advantage and create something I could show off and wear!
Step 1: Drafting a Design
I used drafting paper, a compass, and protractor to draft my design. I started with a circle of diameter 5". I then bisected the circle to leave me with two equal halves. I bisected one hemisphere and marked the midpoint and connected the edges of hemisphere to the midpoint. I used the center of my circle to divide the hemisphere into ten 15 degree sectors and one 30 degree sector. I used lines and the midpoints of each segment to fill my necklace with triangles and a diamond. I have attached my sketch if you had trouble following my description.
Step 2: Gathering Materials
modeling software / Google SketchUp 2015
3D printer / Makerbot
wire cutters, needle nose pliers
2 jump rings of 8mm gauge
metal chain (2 strands of desired length)
lobster clasp of 12 mm gauge
Step 3: Create Your File
I am not very familiar with modeling software so I used Google SketchUp. You just as easily can make this design in Inventor or Rhino.
Step 1: Draw Your Circle
On the x y coordinate plane draw a circle with an origin at the intersection of the x and y axis. Bisect the circle with a diameter. Draw a radius to bisect the hemisphere. Connect the diameter to the midpoint of the bisect line.
Step 2: Guide Lines
Draw lines from the origin to the outer edge. The angle measures are ten angles of 15 degrees and one angle of 30 degrees. The 30 degree angle is the center most angle.
Step 3: Necklace Design
Delete the unneeded guide lines. Draw triangles from the radi lines to the midpoint of the next radi. The triangles of the left face right and the right side faces left.
Step 4: Inscribe the Triangles
Using the Offset tool inscribe the triangles 1/16".
Step 5: Deleting Unwanted Areas
Right click to delete the center triangles. If you skip this step your design will be a solid boomerang shape.
Step 6: Final Edits
Delete the middle lines. After deleting offset the outer edge 1/16".
Step 7: Extrude Your Model
Use the Push/Pull feature to extrude your necklace to the desired thickness (I chose 1/8").
Step 8: Extension Warehouse
The Makerbot works best using .STL files. In the Extension Warehouse I had to download a program to convert .SKP files to .STL files.
Step 4: Printing
I have attached my .STL file. I encourage you to play with modeling software and create something that is your own.
Step 5: Necklace Assembly
Step 1: Necklace Length
Decide where your necklace should lay. I made mine long enough to wear with a scarf.
Step 2: Cutting the Chain
Use the wire cutters to break a link in the chain.
Step 3: Adding Jump Rings + Start to Assemble
Open the jump ring and insert your chain inside. Then insert the necklace inside. Close the jump ring and repeat on the other side.
Step 4: Adding the Lobster Clasp
Open the jump ring and insert the lobster clasp inside. Close the jump ring and repeat on the other side with the hook.