The Unique Jewelry Brand "Number K" That Tells Your Story

Introducing "Number K (Number K)," a jewelry brand filled with adult playfulness that brings out your individuality. The brand proposes a luxurious way for experienced women to enjoy jewelry, by changing pieces as they change outfits. By scattering carefully selected gemstones on playful designs imbued with messages, they create a one-of-a-kind presence. This jewelry brand, which emits a fantastical sparkle that expresses your true self, will launch in June 2026.

Number K's Commitment to Mature Women Who Have Accumulated Experience

"Number K (Number K)" is a premium luxury brand derived from "KAJA BIJOUX (Kaja Bijou)," born in 2004 with the desire to wear jewelry freely and true to oneself, without being bound by rules. The brand's founder and designer, Yoshiko Mizushima, creates jewelry not for others, but to complete oneself. Her original designs, which resonate with the senses, are all suitable as conversation pieces. A sophisticated collection is available, designed to accompany you in every scene, from extraordinary occasions to everyday use.

Adorning the lustrous 18K gold are high-quality precious stones selected with a unique aesthetic sense. In the pavé setting, where the brilliance of melee diamonds is matched to create a dramatic sparkle, thousands of stones are meticulously chosen for their color, brilliance, and balance, pursuing the most beautiful gradation for each piece. Even in the stone setting, skilled artisans carefully set each stone individually to ensure there are no gaps or unevenness.

Furthermore, to allow customers to appreciate the value of natural stones, of which no two are exactly alike, some collections offer semi-customization where you can select the loose stone yourself. The world's only jewelry, meticulously handcrafted by skilled artisans, will become a special presence that empowers you like a talisman.

A Sophisticated Collection That Luxuriously Colors Your Everyday Life

Common to all collections are timeless designs that are both impactful and can be loved for a long time. Each piece carries a message, allowing you to choose jewelry that fits your mood for the day.

"Voile Ring (Voile Ring)"

[YG x Diamond x Peridot]

¥2,310,000 (tax included)

A new ring reminiscent of a softly swaying veil.

Achieved through a delicate and light form by connecting extremely fine gold threads. This piece, imbued with the meaning of "strength that doesn't show off," expresses a sheer transparency like a soft veil and a beauty that resides in asymmetry. Semi-customization is also available for the randomly set diamonds and peridots, where you can select your preferred gemstones (delivery expected in six months). This exquisite piece showcases advanced craftsmanship, reflecting the technique of connecting fine threads into jewelry.

"Orchid Ring (Orchid Ring)"

[WG x Diamond]

¥3,300,000 (tax included)

A dramatic piece shaped like an orchid flower, exuding elegance and blooming with pride.

Characterized by its graceful design, it is dedicated to women who possess dignified independence. The contrast between the arm that wraps around the finger and the large motif is exquisite. This ring, with each petal rendered three-dimensionally and paved with melee diamonds, is a masterpiece of outstanding craftsmanship.

The diamonds sparkling at the center of the flower motif can also be arranged with different stones or colors.

"Hippo Ring (Hippo Ring)"

(Right) [WG x Diamond x Blue Sapphire x Ruby]

¥1,540,000 (tax included)

(Left) [WG x Diamond x Green Garnet x Ruby]

¥1,540,000 (tax included)

The hippopotamus, considered a protective being for women in ancient times.

Its unique form, shaped like a mystical animal, is impressive. Designed for daily wear as a talisman, it prioritizes comfort, achieving a perfect fit that feels like it adheres to your finger and a smooth glide. The ring with charming ruby eyes is available with blue sapphire, green garnet, and pink sapphire as standard options. Additionally, stones can be changed to black diamond or orange sapphire through semi-customization.

"Cactus Ring (Cactus Ring)"

[WG x Diamond x Blue Sapphire 2ct x Green Garnet]

¥2,860,000 (tax included)

A voluminous ring inspired by the cactus, which signifies hidden passion.

By alternately setting green garnets and diamonds, the vitality unique to cacti is expressed three-dimensionally. The oval-cut blue sapphire at the center, which commands attention, can also be changed according to preference. It is recommended to choose gemstones based on their meanings, such as blue sapphire for reason and intellect, green garnet for vitality and regeneration, and inner energy.

"Crown Heart Diamond Necklace (Crown Heart Diamond Necklace)"

(Right) [YG x Diamond]

¥2,640,000 (tax included)

(Left) [WG x Diamond]

¥2,640,000 (tax included)

Because I love it, I naturally want to wear it every day...

The "Crown Heart Diamond Necklace" embodies the concept of "Number K." By geometrically combining round and taper-cut diamonds with rhythmically connected heart motifs, it creates a fantastical sparkle and three-dimensionality. This piece, finished with an overwhelming brilliance of approximately 5 carats in total, has a modern feel different from a single diamond. While luxurious, it is meticulously designed to blend seamlessly with everyday styles, such as T-shirts.

A Highly Anticipated New Store Opens at Hankyu Umeda Main Store!

To coincide with the brand's launch, "Number K Hankyu Umeda Store" will open on the 1st floor of Hankyu Umeda Main Store on June 10, 2026 (Wed). Popular collections will be constantly available in-store, and services such as size adjustments and repairs for purchased jewelry can also be handled. A pop-up event will also be held at 1st Floor Koto Koto Stage 12 from June 17 (Wed). In addition, a private salon in Minami-Horie, offering a wide selection of items, is available by appointment only. This special space, where you can check out both "Number K" and "KAJA BIJOUX," also holds free open days several times a month.

[Store Information]

Number K Hankyu Umeda Store (Inside KAJABI JOUX)

Address / 8-7 Kakuta-cho, Kita-ku, Osaka Hankyu Umeda Main Store 1F

Phone / 06-6361-1381 (Main)

Business Hours / 10:00 AM - 8:00 PM

Closed / Irregular holidays

HP / Scheduled to open September 2026

KAJA BIJOUX Horie Salon

Address / KT Horie Building 8F, 1-10-1 Minami-Horie, Nishi-ku, Osaka

Phone / 06-6599-9595

Business Hours / 11:00 AM - 7:00 PM (By appointment only)

Closed / Irregular holidays

HP / https://www.kajabijoux.com

KAJA BIJOUX LLC

KAJA BIJOUX KT Horie Building 8F, 1-10-1 Minami-Horie, Nishi-ku, Osaka 06-6599-9595