【PREMIUM】Oval Opal Necklace – 925 Sterling Silver, Rhodium Plated
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A pendant necklace of quiet, composed presence, with a natural Ethiopian opal finished in an oval cut. Rounded yet vertically elongated, the oval form is said to symbolize inner beauty and self-expression—and holds the largest stone surface in the series. With every touch of light, the play-of-color shifts through blue, green, and orange, shining at a scale only this size can offer.
Natural opal, nurtured over long ages by the earth of Ethiopia, wears a one-of-a-kind expression that no two stones share. Add just one at your neckline, and it brings a quiet character and glow to the day’s outfit.
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About Opal
October
October Birthstone
Scorpio
Oct 24 – Nov 22
Libra
Sep 23 – Oct 23
Ethiopian opal forms as rainwater deposits silica over long ages within silica-rich rock created by volcanic activity. Its “play-of-color”—shifting, multicolored light born from the refraction of light—is opal’s greatest characteristic. Even viewed from the same angle, a single change in how the light strikes reveals an entirely different expression—the unique charm of this stone.
Long cherished as a stone of hope, positivity, and inspiration, opal is said to heighten the wearer’s sensitivity and creativity, giving the strength to move forward without fearing change. It is October’s birthstone, associated with Libra and Scorpio.
Materials & Finish
The thin and thick chains use different clasp sizes. Each uses a spring-ring clasp sized to the weight of its chain, and both are Italian sterling silver 925.
Ethiopian Natural Opal × Italian Sterling Silver 925
A pendant combining a play-of-color Ethiopian natural opal with high-quality Italian sterling silver 925. Two materials that draw out each other’s character in a refined pairing.
Rhodium Plating
A rhodium coating on the silver surface makes it resistant to tarnish and scratches. It keeps its beautiful shine for a long time and suits everyday wear.
The Series’ Largest Stone Face — Oval Form
At approx. 8×6mm, the oval cut has the widest stone surface in the series, letting you enjoy the play-of-color dynamically. Its soft outline adds a feminine impression at the neck.
Hypoallergenic
Made with nickel-free, lead-free Italian sterling silver 925. The rhodium plating further reduces the metal’s contact with the skin.
Product Details
| Item No. | SN260303 |
| Material | Ethiopian Natural Opal / Italian Sterling Silver 925 / Rhodium Plating |
| Opal | Approx. 8×6mm / 0.72ct |
| Chain Length |
Thin chain (standard) | 16 in. (approx. 40cm) Thin chain (extended) | 18 in. (approx. 46cm) Thick chain / unisex | 18 in. (approx. 46cm) |
| Chain Width |
Standard: 0.1cm wide Thick chain: 0.2cm wide |
Styling Ideas
- Pair with wide-necked tops or dresses to set off the soft oval form—the play-of-color brings a radiant touch to your décolletage
- Add it to a simple tee or knit as a focal point at the neck. At approx. 0.72ct, the stone has just enough presence to quietly elevate a simple outfit
- As October’s birthstone, it also makes a lovely birthday or anniversary gift. The largest oval cut in the series suits truly special occasions
- Layer it with other shapes like round or marquise to enjoy the contrast of different forms
Explore Other Shapes
※ Measurements are taken using our own method; slight variations may occur.
※ As this is a natural stone, there are individual differences in color, shape, and size. Thank you for your understanding.
SMUK is a Tokyo-based sustainable jewellery brand built on the principles of “Less trash, more marine life” and “Safe Wildlife.”
Our creations are primarily crafted from 925 sterling silver, beautifully finished with rhodium or 14K/18K gold plating, and we also offer solid 14K gold pieces.
Every design is made with care for metal-sensitive skin and features natural gemstones such as opal and aquamarine, adding a refined brilliance to everyday life.
• Due to the characteristics of the materials and the manufacturing process, slight variations in color, shape, or size may occur. We kindly ask for your understanding in advance.
• Products made with natural materials may have individual differences in patterns, colors, and inclusions. Product photos are for reference only, and slight variations may occur due to the nature of the materials and manufacturing process.
• We make every effort to ensure that the colors in the photos are as close to the actual product as possible; however, the appearance may vary depending on lighting conditions and your monitor settings.
※ Returns or exchanges cannot be accepted for the above reasons. In the unlikely event that the product is defective or damaged, we will respond in accordance with our Return & Refund Policy. Please make sure to review our [Return & Refund Policy] before placing your order.
Pre-order items are currently being produced or are awaiting arrival, and are therefore not available for immediate shipping.
- Inventory will be secured once your order is confirmed, but the shipping schedule may change depending on production or logistics conditions.
- All pre-orders are paid in advance and cannot be cancelled, returned, or exchanged.
- If a pre-order item is purchased together with in-stock items, the entire order will be shipped once all items are ready.
If you wish to receive in-stock items sooner, please place separate orders. - The estimated shipping date is shown on each product page, but it is only an estimate and may change.
- In the rare case that production is discontinued or significant supply issues occur, we will contact you individually to arrange cancellation or a refund.
- Please note that no changes to the order (items, quantities, shipping address, etc.) can be made after the order is placed.
• All orders are shipped from Singapore (Headquarters).
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■ Delivery Time
Domestic・JAPAN
- 2 - 3 business days (Complimentary standard shipping on all orders).
International・Expedited
(For all orders under JPY ¥30,000 a shipping fee of JPY ¥3,000 will be applied at the checkout).
- Asian countries: 4 - 7 business days
- Rest of the World: 7 - 14 business days
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■ Estimated Delivery Date
- Orders placed before 10:00 am : Same-day shipping
- Orders placed After 10:00 am : Shipment on the following day
※ Excluding weekends and public holidays.
For more information, please visit :
https://smuk.jp/en/policies/shipping-policy
✦ Payment Methods
For immediate payment methods such as credit card, PayPal, PayPay, Apple Pay, and Google Pay, the payment will be confirmed at the time the order is completed.
✦ Payment Deadline
For instant payment methods such as credit cards, PayPal, Apple Pay, Google Pay, and PayPay：
Payment will be completed at the time of order confirmation, and shipment will be prepared accordingly.
For bank transfer and convenience store payments：
Please make the payment within 3 days from the order date.
Your order will be shipped after confirming your payment.
※ A payment fee of 220 yen will be charged for convenience store and Pay-Easy payments.
925 Sterling Silver
SMUK believes in the quiet power of nature.
That is why we choose to work with materials that embody authenticity, using 925 sterling silver as our main metal.
Just like natural gemstones, silver carries a gentle energy born from the earth.
Since ancient times, it has been cherished as a symbol of intuition, emotion, and protection, quietly accompanying people through their lives.
In recent years, many accessories have been made from stainless steel or brass coated to appear silver, but even if they look similar, the difference in material makes a significant impact on how they feel against the skin and how comfortably they can be worn over time.
At SMUK, we carefully select every element with sincerity, including the parts you cannot see, to create jewelry that feels natural, comfortable, and made to be worn for years to come.
For more details:
The Choice of Silver 925 — Jewelry that Lives with the Power of Nature
At SMUK, we use four types of plating finishes, each selected to suit the design and materials of the piece.
Rhodium Plating — A rare platinum-group metal. Tarnish and scratch resistant, with a bright, clear silver tone. Gentle on sensitive skin.
18K Gold Plating — 75% fine gold over sterling silver. Warm, deep gold color that flatters all skin tones.
14K White Gold Plating — 58.3% fine gold with a soft, cool white tone. Pairs beautifully with pearls and delicate designs.
Gold Vermeil — Sterling silver (925) base with a gold layer 2.5+ microns thick. More durable than standard plating with a longer-lasting shine.
For a full breakdown of each finish, care tips, and how to choose:
