Ben Kokes wanted to give a ring to his sweetheart, and to make it interesting, he decided to create a ring with an inductive loop that would cause the stones to light up when they were close to a power-source. He documented the tricky technical problems that cropped up during the build, and it sounds like the romance part came out well, too:
The final idea was to embed a LED and copper coil assembly inside the titanium ring, illuminating it from under the stones when it was in close proximity to an induced alternating magnetic field (henceforth called 'the transmitter'). Autodesk Inventor helped me develop all of the dimensions and constraints for the design. Having some help, I was able to obtain her ring size and the rest of the measurements were based from there (15.72mm if anyone was wondering)...
... Of all the challenges presented in making the ring, affixing the stone is the most difficult. Traditionally, stones are affixed by mechanical means -- prongs, groves or snaps. Epoxies will delaminate from the attachment surfaces due to microstresses, thermal cycling, and other unmentioned movements. The stone may be attached now, but eventually it will fall out. It's just a matter of time.
With that in mind, I had 4 initial ideas for affixing the stone: thermally expanding the hole, hole deformation, point expansion deformation, and epoxy. Ultimately, I went with the epoxy method for attaching the stones.
The first test was to try and heat the ring, expand the hold and drop in the stone. When the hole cooled and contracted, it would hold the stone in place. Not only does the hole not expand enough, if I was lucky enough for it to happen (it did once), the stone would fracture along pre-existing crack lines.
Project Longhaul (via Hacker News)
Two minor characters from my novel 
The America Invents Act changed U.S. patent law to allow preissuance submissions, a mechanism by which third parties can submit patents or printed publications to the United States Patent & Trademark Office (USPTO) for consideration during patent examination, along with “a concise description of the asserted relevance of each submitted document.”[2] The U.S. Congress intended preissuance submissions to help the USPTO increase the efficiency of examination and the quality of issued patents.[3] Congress did not, however, intend the use of this mechanism to interfere with patent examination.[4] Nor did it intend preissuance submissions to allow for third party protest or preissuance opposition.[5] Yet a segment of the 3D printing (3DP) community, known as Makers, is using preissuance submissions as a sword to oppose 3DP-related patent applications. Perhaps more importantly, they are leveraging the concept of crowdsourcing to do so, potentially creating problems for patent applicants everywhere.[6]
