Welcome to the World of CAS&Kera

Fine jewelry, made with 18ct gold and zirconia ceramic, infused with sound.

CAS&Kera is a California company founded in 2023.

Our mission is to create luxury fashion accessories integrated with audio technology, without compromising on design, precious materials, artisanal craftsmanship, or useability.

With strong ties to our manufacturing partners in Sweden, and technology partners in Asia., we were able to create earKron - the world's first true luxury audio ear-cuffs in 18ct gold and zirconia ceramic.

Founders Helena + Daniel

Our founders, who’s multi-award winning, global work in fashion, lifestyle, and entertainment has spanned three decades, have led global brands such as Maison Margiela, DSquared2, Diesel, and Gentle Monster, and worked with luxury audio-technology brands such as Bang & Olufsen and Atomic Floyd.

They have collaborated with countless iconoclasts across the entertainment and arts industries and have provided designer fashion and style solutions for the world’s most exciting talents, including Beyonce, Bad Bunny, Timothee Chalamet, Billie Eilish, Karol G, Rhianna, Madonna, Margot Robbie, Lil Nas X, and hundreds more.


The process of producing zirconia ceramic is incredibly difficult, and takes a level of expertise that limits its use to luxury brands.

The technology molds highly complex ceramic mechanics at a tolerance of +/- 0.05 mm. Our zirconium, sintered at 1,500 degrees, is then highly finished to a pearl-like gloss, that is virtually unscratchable and very hard to break.

We complete the design using the finest 18ct gold and rose gold available, fused with titanium memory alloy that is malleable, yet maintains it's shape.

reddot design award

Recipient of the RedDot Design Award

The Jury were particularly impressed with how this wearable blurs the boundaries between fashion and technology:

“It accentuates the wearer’s personal style while offering a convincing acoustic performance.”

Open-Ear Design

earKron® ear-cuffs are designed to sit on the ear, rather than inside it, allowing you to talk and listen, while still being aware of your surroundings.

earKron® was created to be fine jewelry, so comfort was vital. The design means you can wear them for long periods.

They are also safe for your ears. The World Health Organization warned that 1.1 billion young people are at risk of hearing loss because of earbuds.

We enlisted world-renowned sound engineers from stables such as Harmon Karman, to craft a sound in the 'Goldilocks zone' - crystal clarity, balanced levels, and subtle tones.


Best In-Class Warranty

We want you to have a first-class experience with CAS&Kera, so we offer one of the most comprehensive warranty packages in the industry.

  • One month full-refund guarantee.
  • One year replacement guarantee, in case of accidental damage.
  • Two year full replacement warranty.

See the warranty section for further details.

Jewelry Reimagined

When making earKron®, it was important to maintain the highest level of quality, using precious materials so that you enjoy them for years to come.

earKron® doesn't compete with the earbuds you may already own, instead they are jewelry pieces with audio technology for modern life.

earKron® will compliment your style, be kind to your ears, and deliver crystal clear audio. We hope you'll love and value them as much as we do.