Marquise Opal Necklace – 925 Sterling Silver, Rhodium Plated
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The proportions are considered — at 8×4mm, the stone is large enough to read clearly at the neckline, yet refined enough to wear through different occasions without disrupting the balance of a look. Each opal is a natural formation and carries its own pattern of colour play.
About Opal
October
Oct Birthstone
Scorpio
Oct 24 – Nov 22
Libra
Sep 23 – Oct 23
Ethiopian opal is formed inside beds of volcanic silica rock, where rainwater seeps through the earth over thousands of years and deposits silica in the cavities it finds. The silica builds up in layers so fine that they diffract visible light — producing the play-of-colour that makes opal unlike any other stone. The same stone can appear blue in one moment, green the next, and orange when the light shifts again.
Long regarded as a stone of hope, positivity and inspiration, opal is said to sharpen intuition, encourage creativity and give the wearer the confidence to move forward through change. As the October birthstone, it carries a particular resonance for Scorpio and Libra — signs associated with transformation and the search for balance.
Materials & Finish
The fine and thick chains feature different-sized lobster clasps, each matched to the weight of its respective chain. Both are crafted from Italian sterling silver 925.
Ethiopian Opal × Italian Silver 925
Ethiopian natural opal set in Italian-made sterling silver 925 — the stone's shifting colour contrasts cleanly with the cool, consistent surface of the silver without competing with it.
Rhodium Plating
A rhodium finish is applied over the sterling silver, adding resistance to tarnish and surface wear. The plating helps the piece hold its appearance through regular use.
Elongated Marquise Silhouette
The pointed marquise cut creates a vertical line at the neckline — a silhouette that is distinctive without being bold, and that frames the opal's play-of-colour with a considered geometric tension.
Hypoallergenic
Nickel-free and lead-free Italian sterling silver 925. The rhodium plating provides an additional barrier between the metal and the skin, suitable for those with sensitivities.
Product Details
| SKU | SN260301 | |
| Material | Ethiopian Natural Opal / Italian Sterling Silver 925 / Rhodium Plating | |
| Opal | approx. 8×4mm / approx. 0.54ct | |
| Chain Length | Fine Chain (Standard) 16 inches (approx. 40cm)・Fine Chain (Extended) 18 inches (approx. 46cm)・Thick Chain (Unisex)18 inches (approx. 46cm) | |
| Chain Width | Fine Chain: 0.1cm width・Thick Chain: 0.2cm width |
How to Wear
- With a V-neck top or shirt — the marquise shape follows and extends the neckline's natural angle, giving the pendant a purposeful position rather than just resting at the collarbone
- With a simple dress or tailored outfit — the distinctive shape provides a point of interest at the neckline that feels considered rather than decorative
- As an October birthday gift — the stone's birthstone significance and the opal's natural variation mean no two pieces look exactly the same, giving the gift a one-of-a-kind quality
- Layered with the Round or Oval style from the same collection — the contrasting shapes work together at different lengths to add dimension without clashing
Explore Other Shapes
* Measurements are taken using our own method. Slight variations may occur.
* As this is a natural stone product, each piece may vary slightly in colour, shape, and size.
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:
