About Us

 Founder of three x seven Jewelry

Asuka Saito Jewelry Designer

Founder of three x seven Jewelry
Award-Winning Designer


Born in Sapporo, Hokkaido, Japan, amidst its breathtaking natural landscapes and rich cultural traditions, Asuka Saito, the founder and award-winning designer of three x seven Jewelry, has always harbored a unique sensibility deeply rooted in Japanese aesthetics. This profound appreciation for Japan's vibrant nature and traditional cultures, offering a kaleidoscope of colors through the changing seasons, has significantly influenced her creative pursuits in the world of art and unique jewelry design from an early age.

Her commitment to ethical sourcing and the environment took her beyond the design table; In 2022, three x seven Jewelry became Fairmined licensed, and in 2023, Asuka visited Fairmined gold mines, meeting with the miners and witnessing the mining processes firsthand. These experiences have profoundly influenced her approach to jewelry making, ensuring that every piece of three x seven Jewelry not only embodies artistic excellence but also respects the people and the planet.

Starting her career in San Francisco at a long-standing jewelry company, Asuka's designs have gained international recognition. With a vision to foster harmonious development with society, she founded three x seven Jewelry, merging modern design with an unwavering commitment to quality, sustainability, and the well-being of communities involved in the production process.

Through three x seven Jewelry, Asuka aspires to make a meaningful impact, crafting pieces that uphold the values of environmental consciousness, social responsibility, and timeless beauty, aiming for a brighter future for all.

"...  Every piece we create is a step towards a world where beauty and ethics shine together, illuminating smiles across the globe."

The Fairmined Trip: Asuka's Visit to the Chedé Mining Organization in Cauca, Colombia, 2023 - A Visual Journey


three x seven Jewelry is a San Francisco-based sustainable jewelry brand, dedicated to creating pieces that embody beauty, emotion, and ethical values. At the heart of our efforts is a desire to deliver jewelry that brings smiles to everyone involved—from the hands that craft each piece to the lives they touch.

Our ethos is defined by two core principles:

  • Connection Through Jewelry: We believe in crafting pieces that do more than just adorn. Our jewelry serves as a bridge, connecting the unseen emotions with the tangible beauty of each piece. It's not just an accessory; it's a repository of personal stories, emotions, and meanings, making it a cherished part of the owner's life. This connection is our way of spreading smiles, ensuring that every piece not only shines but also brings joy and significance to its wearer.
  • Ethical and Harmonious Development: Our commitment extends beyond aesthetics. We are dedicated to ethical practices that positively impact people, society, and the environment. From careful selection of low-impact materials to ensuring a positive working environment for those who mine and craft our jewelry, we aim to tackle social issues and promote a sustainable and harmonious future. It's our belief that a truly beautiful piece of jewelry is one that contributes to the happiness and well-being of all those it touches. 

"...We provide jewelry that brings smiles to the faces of everyone involved."

Primarily Handcrafted in San Francisco studio

Located in San Francisco, our main jewelry studio at 1737 Post Street Suite 303 San Francisco, CA 94115 is where the magic happens—most of our exquisite jewelry pieces are meticulously handcrafted locally.

Our dedicated sourcing team tirelessly seeks the right partners, ensuring we collaborate exclusively with suppliers and manufacturers committed to strict ethical standards for sourcing both mined and lab-created gemstones. We welcome those who are interested in seeing our craft in action to visit us. Please email us at threexseven.style@gmail.com for more details.


The exceptional creativity of our jewelry designs showcases the precise craftsmanship of our artisans. At three x seven Jewelry, each piece is primarily designed and crafted in San Francisco, CA, where it also undergoes final finishing to achieve its ultimate form. While we primarily focus on made-to-order fine quality jewelry, setting us apart from mass-produced, high-volume manufacturing, we also offer select pieces available for immediate purchase.

Every piece of three x seven Jewelry is guaranteed to be made of the highest quality materials and craftsmanship, designed to last a lifetime. Our product range includes bridal jewelry, wedding bands, and fine jewelry, all tailored to meet the unique needs and tastes of our customers.  

Corporate Responsibility

At three x seven jewelry, we pledge to uphold the highest standards of social responsibility and environmental sustainability in every facet of our operations. This commitment to ethical sourcing and preserving our planet is at the core of our business model.

Our efforts include:

1. Using 100% recycled metals in our manufacturing processes as part of our effort to reduce our environmental impact.

2. Sourcing Fairmined certified gold that supports responsible artisanal and small-scale mining organizations, promoting fair labor practices.

3. Procuring fair-trade materials to enhance the livelihoods of workers and their working conditions.

4. Ensuring all diamonds and gemstones are conflict-free, upholding the highest ethical standards.

5. Implementing recyclable, biodegradable, and ECO-certified packaging to minimize waste and environmental impact.

6. Providing well-crafted and elegantly designed pieces at a fair price, ensuring value for our customers.

7. Supporting activities and organizations dedicated to environmental preservation and solving social issues, reinforcing our commitment to making a positive impact.

 In embodying our philosophy of connecting emotions and meaning through our jewelry, these seven initiatives are our pledge to not only beautify but also ethically enrich our world and communities. By doing so, we aim to create a lasting legacy of sustainability and compassion that resonates with every piece we craft.



Studio Location:

1737 Post Street Suite 303
San Francisco, CA 94115