Collet Ring - Crystal Black Opal -

*Due to the use of natural stones and handmade production, each item is unique and may vary.

*Due to the nature of natural stones and device settings, the color of the product may differ from the image.

*The size measurements listed are the longest parts of each side (length, width, and thickness).
For designs where the stone is held by a setting or has a base, the metal part may be included in the measurement. Please note that there may be slight discrepancies.

*Most of MONAKA's natural stone items are one-of-a-kind. Items also sold in stores may be sold out due to time differences, so please be aware of this in advance. In case of shortage, we will contact you within 3 days.

While there are individual differences, we may have other loose stones in stock. In such cases, we may offer an alternative.

In the unlikely event that you receive a product different from the one you ordered, or a defective item, we will accept returns or exchanges. We apologize for the inconvenience, but please contact us at info@monakajewellery.com.

Please note that we cannot accept returns or exchanges in the following cases:

* Requests for returns or exchanges due to customer convenience
* Products that have been more than 7 days since arrival
* Products that show signs of use
* Products for which accessories such as the included box or warranty have been lost
* If the product's condition differs significantly from when it was delivered

If an exchange is not possible due to the item being a one-of-a-kind item or out of stock, we will issue a refund instead.

In the case of returns or exchanges due to defects or incorrect delivery, we will cover the shipping costs.

Once payment is confirmed, we will promptly proceed with production. Therefore, please understand in advance that we cannot accept changes to your order details such as length, size, or material for custom-made items.

In-stock items will be shipped within 7 days of payment confirmation.
*Year-end and New Year holidays will follow business days.
We will provide you with a tracking number once shipping is complete, so please wait until delivery.

Please note that we do not accept requests for specific delivery dates/times or delivery methods.
We apologize for the inconvenience, but please make arrangements and confirm details yourself using the tracking number that will be provided after shipping.


*We will only contact you within 3 days if an item is out of stock.

*Custom orders will be shipped as soon as they are completed. You will be notified with a shipping notification and tracking number once shipping is complete.

*If you purchase custom-made items, items with size changes, or other such items together with in-stock items, all items will be shipped together according to the custom-made item's delivery schedule.
If you would like separate deliveries, please let us know and we will arrange for separate shipping at an additional shipping cost.

Customers who purchase 55,000 yen or more (tax included) will receive free shipping.
All deliveries will be made via Yamato Takkyubin Compact.

＜Shipping Fees＞
・All regions except those listed below: 640 yen
・Hokkaido, Fukuoka, Saga, Nagasaki, Kumamoto, Oita, Miyazaki, Kagoshima: 700 yen
・Okinawa: 820 yen

International shipping is handled by Japan Post, UPS, and FedEx. The shipping carrier used for precious metals will vary depending on the destination country or region.

Shipping costs vary depending on the destination country and the product price. Shipping costs include insurance. Additionally, customs clearance fees may be incurred depending on the product price.
Shipping costs will be automatically calculated at checkout, please confirm them there.

Customs duties and import taxes vary by destination country and will be billed directly to you upon receipt, separate from the shipping fees.
We kindly ask that you research customs duties for your respective country in advance. Please note that we are unable to answer questions regarding customs duties.

Delivery times vary by destination country, ranging from several days to several weeks, and in some cases, around one month.
If you order made-to-order items, the shipping period is not included in the production lead time. Please allow for the shipping period in addition to the production lead time.

【Standard Delivery Time】
・Custom Orders: 3 months
・Partially Custom Orders: 4 months

Please note that if your order falls during long holidays such as Obon, New Year's, or Golden Week, an additional 15 days will be added to the standard delivery time. We appreciate your understanding.

Currently, for both our online shop and directly managed stores, the lead time is approximately 2.5 months. After your order is complete, we will send you an email with an estimated delivery date.

*Please note that some designs may be subject to a size change for a more comfortable fit.

*If your order includes a long holiday period such as Obon, New Year's, or Golden Week, an additional 15 days will be added to the standard delivery estimate. We appreciate your understanding.

Once your item is complete and shipped, we will notify you with the tracking number.

Please select your desired size and add it to your cart along with the product to purchase.
→Click here for size down requests
→Click here for size up requests

If you wish to change your flat earring product to clip-on earrings,
please add the clip-on earring conversion to your cart and purchase it along with the product.

You can choose between stud type or hoop type.
→Click here if you wish to convert to clip-on earrings

Please select your desired size from each design and add it to your cart along with the product to purchase.


→Click here for bracelet size down/up requests
→Click here for necklace size up requests


→Click here for necklace size down/up requests

→Click here for bracelet size down/up requests
→Click here for necklace size down/up requests

Jewelry, including natural stones, can be damaged if dropped or subjected to strong impacts, so please handle with care.

Furthermore, refrain from wearing jewelry when doing housework, bathing, sleeping, carrying heavy loads, or playing sports, as this may lead to deformation or damage to the jewelry, or unexpected injuries.

Broken natural stones cannot be repaired, so we recommend putting them on in a soft place, such as on a bed or carpet.

Natural stones with low hardness, such as coral, are particularly vulnerable to impact and chip easily, so please handle with extreme care.

Avoid long-term storage in direct sunlight or in dry, hot, and humid environments, as this may cause deterioration or discoloration.

Also, please refrain from wearing the jewelry in seawater or hot spring water, as these may cause discoloration of metals and deterioration of natural stones.

Natural stones (especially pearls and opals) may deteriorate or discolor if left with moisture or sweat on them. Cosmetics (sunscreen, hand cream, etc.) and chemicals may also cause loss of luster. After use, please gently wipe the jewelry with a jewelry cloth or soft cloth before storing it.

Jewelry can easily scratch each other and may break if they come into contact. When carrying, store them in a jewelry case so they are not crushed. For storage at home, we recommend using a tray or a case with individual compartments.