Frequently Asked Questions
About Our Pearls
Q: What type of pearls does Sumi use?
A: Sumi exclusively uses Japanese Akoya pearls — widely regarded as the finest cultured pearls in the world. Known for their exceptional luster, perfectly round shape, and mirror-like surface quality, Akoya pearls have been cultivated in Japan for over a century.
Q: Are the pearls natural or cultured?
A: Our pearls are cultured Akoya pearls, grown in the pristine coastal waters of Japan. Cultured pearls are real pearls — the only difference from natural pearls is that the process begins with careful human intervention. Each pearl takes 1–3 years to form inside the oyster.
Q: Why “Sumi”?
A: Sumi (澄) means “clarity” and “purity” in Japanese — the quality of water so clear you can see straight through to the bottom. Inspired by the Zen philosophy of “Nothing more, Nothing less,” our jewelry embodies quiet refinement. Each piece is designed to reveal your true beauty, not to decorate it.
Jewelry Care
Q: How should I care for my Sumi pearl jewelry?
A: Pearls are organic gems and deserve gentle care. Wipe them with a soft, damp cloth after wearing. Avoid contact with perfume, hairspray, and harsh chemicals. Store them separately in a soft pouch to prevent scratching. With proper care, your Sumi pieces will develop an even richer luster over time.
Q: Can I wear my pearl jewelry in water?
A: We recommend removing your pearl jewelry before swimming, bathing, or exercising. Prolonged exposure to water, chlorine, and salt can weaken the nacre and dull the pearl’s natural shine.
Orders & Shipping
Q: Where do you ship?
A: We ship worldwide. Standard shipping typically takes 5–10 business days for international orders. All pieces are carefully packaged in our signature Sumi gift box.
Q: Can I return or exchange my purchase?
A: We accept returns within 14 days of delivery for unworn items in original condition and packaging. Please contact us at support@okos.jp to initiate a return. Custom or personalized pieces are final sale.
Q: Do you offer gift wrapping?
A: Every Sumi piece arrives in our elegant branded packaging, making it gift-ready. We can also include a personalized message card at no extra charge — just add a note at checkout.
About Sumi
Q: What makes Sumi different from other pearl jewelry brands?
A: Sumi is rooted in Zen philosophy — “Nothing more, Nothing less.” We believe true luxury lies in restraint, not excess. Each piece is designed to be timeless, minimal, and deeply intentional. We work directly with pearl farmers in Japan to ensure the highest quality and ethical sourcing.
Q: Are your pieces handmade?
A: Yes. Every Sumi piece is handcrafted by skilled artisans. From pearl selection to the final setting, each step is done with care and precision. No two pieces are exactly alike — that’s part of their quiet charm.
Q: How can I contact Sumi?
A: You can reach us anytime at support@okos.jp or through our Contact page. We typically respond within 24 hours. You can also follow us on Instagram for updates and behind-the-scenes content.