Berlin-based designer David Bizer has created Waveform Jewelry, a line of accessories that are customizable... to the human voice.
Using a program, app or digital recording device, customers can record themselves (or a loved one) saying whatever they choose--Bizer recommends between two syllables and a full sentence: "I love you," for example. The soundwaves of those words are then visually represented in plywood or acrylic "beads" or discs, strung together for a unique necklace or bracelet, which Bizer calls Waveform Jewelry. The beads range in size from 1 millimeter to 3 millimeters (the larger the bead, the more expensive it is) and come in black, blue, brown, transparent and white. Or you can get your soundwave in a solid piece of metal--gold-plated brass, silver or stainless-steel, for example--in a variety of matte and polished finishes. The solid soundwaves can be made into a keychain or earrings.
Prices range from $39 to $135, depending on the item. Everything in Bizer's shop is listed in euros but will automatically convert to dollars at checkout when paid for with PayPal (you can also use direct bank transfer).
If you can't afford Bizer's Waveform pieces, or you want to take the customizing to the next level--and you have access to a 3-D printer--Bizer has a template available at instructables.com/id/Waveform-Necklace-Bracelet.