Eye-catching color stones with distinctive character. From a collection of unique gemstones that Takashi Fujimori, our owner designer, discovered while traveling the world, you can select a single stone and have it crafted into a special engagement ring.
We are now pleased to offer our collection of unique color stones, which we have been stocking for custom jewelry, for selection at the MITUBACI TOKYO handmade workshop. Enjoy the striking individuality and vibrant colors that set these gemstones apart from conventional stones.
Color Stone Price
Ring Price
OPTIONS
This is a colored stone currently in stock at MITUBACI. The price includes the stone setting fee. We can reserve it for you upon request. Please let us know the name of the colored stone at the time of booking.
All stones in inventory are one-of-a-kind pieces. If there is a color stone that catches your eye, please contact us at the time of your reservation and we will hold it for you until your visit.
¥113,300
0.98 ct
True to its name derived from the night sky of East Africa and Tanzania, it is a delicate and gentle blue-purple hue, as if the sky's transition from dusk to night is captured in a single stone. With each change in angle, it shifts in color, displaying a soft expression that gently smiles in your hand. It always stays by your side, peacefully illuminating your everyday life.
Stone Size: 6.10mm
Cut: Round
¥116,600
1.24 ct
A deeply saturated blue sapphire that draws you in. With all extraneous noise stripped away, its clear presence is as if the serene night is gazing back at you. At times it resembles a contemplative eye, and simply having it in your hand makes you forget the chaos around you.
Stone Size: 5.78mm×7.05mm
Cut: Oval
¥113,300
0.54 ct
Demantoid derives its name from the Dutch word for diamond (Demant). Its exceptionally high light dispersion rate produces brilliance that rivals or even surpasses that of diamond, creating an abundance of rainbow-colored fire sparks. Its noble appearance, which shimmers even at the slightest light, radiates an overwhelming presence even in darkness, adding vibrant drama to your hand.
Stone Size: 4.56mm
Cut: Round
¥107,800
0.63 ct
Its name originates from Montana in the United States, where it is mined. A piercing indigo blue mingles with the mystical color characteristic of Montana sapphire. Its presence is like gazing up at the water's surface and sky, as if looking from deep within a tropical sea with light streaming through. Each time you peer into it, its expression changes, elegantly adorning your hand.
Stone Size: 5.03mm×5.01mm
Cut: Cushion
¥115,500
0.76 ct
A rich and deeply saturated yellow sapphire, much like fine brandy poured into a glass.
With the beautiful geometric lines of a scissors cut,
sharp, brilliant sparkle runs through the depths of its color.
It is a special stone that combines refined adult sophistication with modern sharpness.
Stone Size:5.49mm×5.47mm
Cut:Scissors
¥115,500
0.74 ct
Its name originates from the state of Montana in the United States where it is found. It has the high transparency characteristic of sapphires, creating a cool appearance. Unlike bicolor stones where two colors are clearly separated, the complexly layered colors of blue, yellow, and green invite viewers into a mysterious charm.
Stone Size: 5.5mm × 5.8mm
Cut: Pentagon
¥117,700
1.23 ct
A color stone known as Teal Sapphire. Teal refers to the color of duck feathers, and its deep green evokes a forest. The banded blue visible when held to light is captivating, giving this sapphire a special expression. The way it alternates between deep green and blue is like dappled sunlight filtering through a quiet forest. Stone Size: 7.05mm×5.06mm Cut: Octagon
¥122,100
0.90 ct
The name comes from mandarin orange. True to its name, it is a vibrant orange with concentrated energy. This garnet beautifully combines deep color saturation with vividness, shining brightly on the wearer's hand and illuminating it beautifully.
Stone Size: 5.34mm × 3.87mm
Cut: Round
Please hold and view the actual colored stone that catches your interest.
Compare the changing expressions depending on how light falls on it and the deep colors unique to natural stones, then select your favorite stone.
While viewing ring samples, choose your desired material (color), width, and finish.
You may opt for free engraving methods like metal stamping which comprises alphabets, numerals, and original icons. Before working on your actual ring, we will provide you with a silver bar to practice engraving.
If you prefer a more flexible design, such as an illustration or Chinese characters, you can choose the optional laser engraving.
The precious metal plate is made into a ring shape. Since this work requires a lot of strength, a wooden mallet is also used to round it.
After rounding, you will solder your ring under the guidance of our craftsman. Our artisans will solder all platinum rings as they require a license to operate the burner.
* If you choose Platinum 950, the work will be performed by a craftsman in principle, as it requires the qualification of a gas welding technician.
At this stage, you will work with several tools to smoothen and polish the surfaces of your ring.Here the ring shines so beautifully that it reflects the surrounding scenery.
Also, lathing and milling can reproduce the superb quality of a custom-made engagement ring, despite the fact that it is handmade.
The finished piece will be ready for delivery in approximately one week
The color stones introduced on this page vary in size and shape, so the stone setting work takes time. As a general rule, delivery will be at a later date, so please understand this in advance.
Color Stone Price
Ring Price
OPTIONS
Enjoy Tax-free Shopping With Us!
Temporary visitors may enjoy tax-free shopping (10%) with us by presenting your original passport on the day of purchase.
* Applicable to 1.7mm-3.5mm
* Tokyo store only
* Applicable to 1.7mm-3.5mm
* Tokyo store only
In addition to the standard plain finish, you can choose for free the popular hammer finish that brings out the craft aesthetic.
By using a lathe machine, craftsmen shape the ring into a uniform, beautiful, and luxurious-looking ring that evokes a custom-made ring.
* Compatible with ring widths up to 3.5mm. For widths larger than that, please contact us in advance.
Enjoy our free engraving service! Choose between metal stamps for an enhanced handmade vibe and an authentic engraving machine for a neater result.
Alternatively, you may opt for laser engraving to include Japanese, Chinese, emojis, or handwritten characters on your jewelry (additional charges will incur).
Please select your engagement ring from our regular "Bridal Jewelry Course," and in the remarks section, provide the name of the color stone listed on this page.
This course is only offered at our Tokyo store
The finished piece will be ready for delivery in approximately one week
MITUBACI offers a lifetime warranty to ensure you can enjoy your jewelry with lasting peace of mind. Whether handmade or custom-made, each piece is cared for by our skilled artisans. Our after-sales services include resizing, cleaning, and polishing—keeping your jewelry beautiful for years to come.
Our after-sales service includes not only cleaning but also retouching the texture to restore your jewelry’s original beauty. Regular maintenance helps keep your piece shining—feel free to book an appointment anytime to enjoy this service!
The first ring resizing is free of charge! Subsequently, it will be chargeable from ¥5,500 onwards per ring (depending on the condition of your ring).
Tokyo (Sangenjaya)
Tokyu Den-en-toshi line (DT) / Setagaya line (SG)
1-minute walk from Sangenjaya Station
日本語 日本語
English
简体中文
繁體中文
한국어
Español
Italiano+¥11,000
*This option cannot be applied on senban finishes and ring widths above 3.5mm.
+¥16,500
When diamonds are fastened to the surface of the ring, their brilliance is even more striking.
 White Diamond |
 Ice Blue Diamond |
 Black Diamond |
Pink DiamondThe 4-point setting is MITUBACI’s standard gemstone setting. This classic style complements a wide range of ring designs.
Resembling a flower, this decorative style beautifully enhances the shine of both the gemstone and the metal.
*Not compatible with Senban finishes. Applicable to ring widths of 2.0mm and above.
* Not available for the secret gemstones (inner stones)
+¥5,500
Add deeper meaning to your jewelry with a secret gemstone set on the inner wall of your ring.
+¥11,000
* Diamond・Ruby・
Sapphire・Emerald are
+¥16,500
 January — Garnet |  February — Amethyst |
 March — Aquamarine |  April — Diamond * |
 May — Emerald * |  June — Moonstone |
 July — Ruby * |  August — Peridot |
 September — Sapphire * |  October — Tourmaline |
 November — Citrine |  December — Tanzanite |
Gemstone setting takes around 1~1.5 hours after basic ring completion. If you are pressed for time after the workshop, please let us know and we will schedule for delivery at a later date.
The 4-point setting is MITUBACI’s standard gemstone setting. This classic style complements a wide range of ring designs.
Resembling a flower, this decorative style beautifully enhances the shine of both the gemstone and the metal.
*Not compatible with Senban finishes. Applicable to ring widths of 2.0mm and above.
* Not available for the secret gemstones (inner stones)
+¥5,500
*Same-day service available only in Tokyo
+¥5,500
Choose your preferred font from our selection and engrave dates, names, and more. In addition to numbers and alphabets, we also support Kanji characters and our in-house engraving illustrations.
*Same-day service available only in Tokyo
¥11,000
Handwritten messages and hand-drawn illustrations can also be laser-engraved! Please prepare your artwork in advance and send us a scanned copy prior to your visit, or create it in-store upon arrival. Kindly note that data provided on the day may require additional processing time.
*Same-day service available only in Tokyo
+¥11,000
Design your pixel art in a 16 x 16 grid and have it engraved on your jewelry. Please submit your design at least 7 days before your visit.
For more information, please visit the Pixel Art Engraving blog.
*Available for rings of at least 3.0mm.
