Summary

This mold allows to create diamonds from ice, gelly, silicon, epoxy, etc. One to several diamonds can be created at once using different models.
The holes have 3.2mm diameter for 3mm screw.
Use ABS to make model more flexible, especially for ice.

Print Settings

Printer:

JGAURORA Z - 605S

                                            <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>Yes</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>Layer 0.1 mm Nozzle 0.4 mm</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>100%</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>Use raft for ABS and other warping materials.<br>Use 100% infill for ice and other extending molds.</p></div>

Post-Printing

IMHO the best way to create a mold is to print it in ABS and then post-process with acetone to have smooth surfaces inside.

How I Designed This

I used OpenSCAD to create a form for the mold with subtracted diamond I created earlier.
http://www.thingiverse.com/thing:2188137

Diamond 57/58 Mold