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SHOPPING GUIDE

januka is a jewelry brand founded on the concept of being "slightly off the norm," free from preconceived notions about jewelry structure and techniques. We provide information to ensure a smooth shopping experience for first-time customers.

Material Characteristics
  • Diamond

    Diamonds are highly resistant to scratches, with the highest hardness value (10 on the Mohs scale). However, they may crack if subjected to pressure from certain directions. The diamond series from januka includes encased designs such as [POSITION] [SPOT] [MOVING] [CON] [ROUND DIAMOND] making them suitable for everyday wear. On the other hand, the [FRAME] series uses thinly sliced diamonds, which are more susceptible to pressure compared to other diamonds. [NATURAL DIAMOND] series features diamonds that are not encased in metal, but their sufficient thickness ensures high durability.
  • Gemstone

    The hardness and properties of natural gemstones vary by type, requiring different handling.[BAND] series, [SLICE] series, which do not encase gemstones in metal, are more prone to impacts from drops or bumps. This open design allows the beauty of natural gemstones to be enjoyed from all 360° angles.[[Sapphires] and [Rubies] are relatively strong gemstones, ranking just below diamonds in hardness. In contrast, [Emeralds] and [Opals] require more careful handling.Emeralds: Due to their crystalline structure, they are sensitive to impact and require cautious handling. Opals: Containing 3–10% water by weight, opals are prone to cracking from impact or drying out and must be handled with care. For all natural gemstones, please handle and store them according to their specific properties to maintain their beauty.
  • K18

    18-karat gold is resistant to oxidation and tarnishing. It can be worn continuously with proper care to avoid exposure to hot springs and sweat. Regular maintenance helps preserve its beautiful shine over time.
  • K10

    K10 gold has a softer hue compared to K18, making it ideal for those who prefer less yellow tones. It is also harder than K18, making it less prone to scratches and deformation during daily wear. However, exposure to moisture or chemicals may cause tarnishing, so it is recommended to remove K10 jewelry before contact with water.
  • Pt900

    Platinum 900 has high hardness, making it resistant to deformation and scratches. It is also more resistant to acids and sweat than K18 and K10 gold, reducing the risk of discoloration. This durability makes it a material that maintains its beauty over long periods.
Ring siza

Ring sizes represent the inner circumference of the ring. You can place orders in increments of 1 or 0.5 sizes. [Click here for the ring size chart]

  • One-of-a-Kind Pieces

    Stock is typically produced around size 11 (Japan size), but custom orders with specified sizes can be made at the time of purchase. Please note that resizing may take approximately 1.5 months before shipment.
  • Other Pieces

    If the product page does not include a size selection option, please write your desired size in the notes section at checkout. If the item is in stock, it will be shipped as early as the next day. For items not in stock, we will contact you via email regarding the required production time.
  • If You Are Unsure About Your Size

    You can download and print [this sizing sheet](A4 size) at home to measure your finger by wrapping the paper around it. Please use this as a general reference only.
  • Ordering a Ring Size Gauge

    A set of[ring size gauges] is available for order. Please return it within one week after delivery. Resizing services are also available.
Ring Sizes Ring sizes represent the inner circumference of the ring. You can place orders in increments of 1 or 0.5 sizes. [Click here for the ring size chart] One-of-a-Kind Pieces Stock is typically produced around size 11 (Japan size), but custom orders with specified sizes can be made at the time of purchase. Please note that resizing may take approximately 1.5 months before shipment. Other Pieces If the product page does not include a size selection option, please write your desired size in the notes section at checkout. If the item is in stock, it will be shipped as early as the next day. For items not in stock, we will contact you via email regarding the required production time. If You Are Unsure About Your Size You can download and print [this sizing sheet] (A4 size) at home to measure your finger by wrapping the paper around it. Please use this as a general reference only. Ordering a Ring Size Gauge A set of [ring size gauges] is available for order. Please return it within one week after delivery. Resizing services are also available. Stock Availability

Stock quantities are listed on the product pages, so please check there. If at least one item is available, it can be shipped as early as the next day.
The [BAND] [SLICE] [POSITION] [FRAME] [NATURAL DIAMOND] series are all one-of-a-kind pieces. If an item is out of stock, it may not be possible to recreate an identical piece. However, it may still be possible to place an order for out-of-stock or sold-out one-of-a-kind items. Please note that some products may not be available for reproduction.For inquiries, please feel free to [contact us](Production may take approximately 1.5 months)

Bridal Ring Orders

The [Bridal ring series]is introduced on the product pages. Rings are made-to-order, allowing you to select the size, width, metal type, and finish. Please note that direct purchases are not available through the online site. We encourage you to view the actual items in person before making a decision. Please visit our flagship store or pop-up shops to consider your options. If you live far away, we can send you a sample set upon request. Feel free to [contact us]

Payment Methods

The following payment methods are available:
Credit card (Visa, Mastercard, JCB, American Express)
Amazon Pay
Apple Pay
Google Pay
PayPal
Amazon Pay
※Please note that bank transfers are not accepted.

Shipping & Delivery
  • Domestic(Japan) Shipping

    A flat rate of 660 yen (including tax) applies nationwide.
  • Delivery Time

    In-stock items will be shipped within 7 days, as early as the next day. For out-of-stock items or those requiring resizing, please allow approximately one month for production. You can specify your desired delivery date and time during checkout.
  • International Shipping

    We also offer international shipping. Shipping methods and fees vary depending on the destination country. Please check the details during checkout. Note that delivery date and time cannot be specified for international orders.
  • Damage During Shipping

    商Products are carefully packaged to prevent damage during shipping. However, if the item is damaged in transit and cannot be used, we accept returns. In such cases, please contact us via [contact us]with details of the damage on the day of delivery.
Resizing, Earring Conversion, Repairs, and Services
  • Ring Resizing

    We offer resizing services for rings.

    First Adjustment:

    1. Size reduction: Free
    2. Increase by 1–3 sizes: ¥2,200~ (K10) / ¥3,300~ (K18, Pt)
    3. Increase by 4–6 sizes: ¥2,750~ (K10) / ¥4,950~ (K18, Pt)
    4. Increase by up to 9 sizes: ¥3,300~ (K10) / ¥6,600~ (K18, Pt)

    Subsequent Adjustments:

    1. Size reduction: ¥5,500~ (K10) / ¥6,600~ (K18, Pt)
    2. Increase by 1–3 sizes: ¥7,700~ (K10) / ¥9,900~ (K18, Pt)
    3. Increase by 4–6 sizes: ¥8,350~ (K10) / ¥11,550~ (K18, Pt)
    4. Increase by up to 9 sizes: ¥8,800~ (K10) / ¥13,200~ (K18, Pt)

    ※Note: Prices may vary depending on the thickness of the ring band.

  • Resizing, Earring Conversion, Repairs, and Services Ring Resizing We offer resizing services for rings. First Adjustment: Size reduction: Free Increase by 1–3 sizes: ¥2,200~ (K10) / ¥3,300~ (K18, Pt) Increase by 4–6 sizes: ¥2,750~ (K10) / ¥4,950~ (K18, Pt) Increase by up to 9 sizes: ¥3,300~ (K10) / ¥6,600~ (K18, Pt) Subsequent Adjustments: Size reduction: ¥5,500~ (K10) / ¥6,600~ (K18, Pt) Increase by 1–3 sizes: ¥7,700~ (K10) / ¥9,900~ (K18, Pt) Increase by 4–6 sizes: ¥8,350~ (K10) / ¥11,550~ (K18, Pt) Increase by up to 9 sizes: ¥8,800~ (K10) / ¥13,200~ (K18, Pt) Note: Prices may vary depending on the thickness of the ring band. Earring Conversion

    We offer conversion services to change pierced earrings into clip-on earrings.
    Please add both the earring item and the [Earring Conversion] option to your cart.

    Convertible Series:

    • Repairs and Maintenance

    • Re-plating

      [CLIP][ROUND]Items such as those in the [CLIP] and [ROUND] series can be re-plated. (¥1,100 per piece, including tax)
      Note: Re-plating for TOMORROWLAND exclusive items is not available.
    • Polishing

      Light maintenance such as polishing scratches on precious metal parts or reapplying matte finishes is offered free of charge, regardless of the number of times. For deeper scratches or special treatments, additional fees may apply, but we will contact you before proceeding.
    • Repair of Damage

      We can repair items with missing or broken parts. If repairs are difficult, we may suggest remaking the item. Repair methods and costs will be explained after reviewing photos or the actual item. Please feel free to [contact us] for assistance.
    • Repair Shipping Costs

      メCustomers are responsible for shipping costs related to maintenance or repairs. Return shipping will incur a fee of ¥660 (including tax /only Japan). Thank you for your understanding.
  • Resizing, Earring Conversion, Repairs, and Services Ring Resizing We offer resizing services for rings. First Adjustment: Size reduction: Free Increase by 1–3 sizes: ¥2,200~ (K10) / ¥3,300~ (K18, Pt) Increase by 4–6 sizes: ¥2,750~ (K10) / ¥4,950~ (K18, Pt) Increase by up to 9 sizes: ¥3,300~ (K10) / ¥6,600~ (K18, Pt) Subsequent Adjustments: Size reduction: ¥5,500~ (K10) / ¥6,600~ (K18, Pt) Increase by 1–3 sizes: ¥7,700~ (K10) / ¥9,900~ (K18, Pt) Increase by 4–6 sizes: ¥8,350~ (K10) / ¥11,550~ (K18, Pt) Increase by up to 9 sizes: ¥8,800~ (K10) / ¥13,200~ (K18, Pt) Note: Prices may vary depending on the thickness of the ring band. Earring Conversion We offer conversion services to change pierced earrings into clip-on earrings. Please add both the earring item and the [Earring Conversion] option to your cart. Convertible Series: BAND SLICE POSITION FRAME NATURAL DIAMOND SPOT Please allow approximately 1 week to 1 month for the conversion process. Repairs and Maintenance Re-plating Items such as those in the [CLIP] and [ROUND] series can be re-plated. (¥1,100 per piece, including tax) Note: Re-plating for TOMORROWLAND exclusive items is not available. Polishing Light maintenance such as polishing scratches on precious metal parts or reapplying matte finishes is offered free of charge, regardless of the number of times. For deeper scratches or special treatments, additional fees may apply, but we will contact you before proceeding. Repair of Damage We can repair items with missing or broken parts. If repairs are difficult, we may suggest remaking the item. Repair methods and costs will be explained after reviewing photos or the actual item. Please feel free to [contact us] for assistance. Repair Shipping Costs Customers are responsible for shipping costs related to maintenance or repairs. Return shipping will incur a fee of ¥660 (including tax). Thank you for your understanding. Gift Wrapping

    Please check the [Add Gift Wrapping] option on the cart screen. We will tie a ribbon on a gift box and include one shopper bag. If gift wrapping is not specified, a shopper bag will not be included.
Returns and Exchanges
  • Order Cancellation Before Shipping

    You can cancel your order before shipping. A full refund of the product price and shipping fee will be provided.
  • Returns

    Returns are accepted within 7 days of delivery for the original purchaser only. Please contact us via [contact form].
    Note: Returns may not be accepted depending on the order details or product condition. Please refer to the "Return Conditions" below for details.

    Conditions for Returns:

    ■返品をお受けできる商品
    1. Products returned within 7 days of delivery in unused, new condition (excluding sale items, resized products, or custom orders)
    2. Defective, damaged, or faulty products
    ※Note: Items must be returned in the same condition as when shipped.
    Items Not Eligible for Returns:
    1. Products returned after 7 days of delivery
    2. Sale items
    3. Resized or earring-converted items
    4. Custom (made-to-order) items, including size orders
    5. Products damaged, stained, or broken while in the customer’s possession
    6. Items (including boxes and accessories) returned in a significantly different condition than when delivered
    7. Used or cleaned products
    8. Items other than the specified product
  • Exchanges

    If there are defects in the product or incorrect items are delivered, we will promptly provide a replacement. Please contact us within 7 days of receiving the product via [contact]including details about the defect or issue. We apologize for the inconvenience, but please provide as much detail as possible about the defective areas. Once we receive your inquiry, we will guide you through the return process.
Contact Us

修If you have any questions regarding repairs, maintenance, or other inquiries, please feel free to reach out to us via our[contact]

You can also contact us through[LINE]
Feel free to get in touch with us. We also share the latest information on pop-up shops and new product launches through LINE.

Flagship Store

〒107-0062
4-23-4-1F Minami-Aoyama, Minato-ku, Tokyo
TEL : 03-6419-7704

Open : 13:00-19:00
Close :Mondays and Tuesdays (Open on public holidays)
○ Any changes to store hours will be announced on our social media.
○ Priority is given to customers with reservations.

You can view products listed on our online shop at the store. If you are nearby, please feel free to visit us.

[Click here to make a store reservation]