The Rolex Submariner Silver Serti Diamonds 40 mm (Ref. 16618) is a rare and highly collectible version of the iconic Submariner, crafted from 18k yellow gold and distinguished by its elegant silver factory Serti dial. The dial features genuine diamond hour markers accented with blue sapphire markers at 6, 9, and 12 o'clock, creating a luxurious contrast against the silver background. Rolex produced this configuration in limited numbers between 1988 and 2008, making it one of the more desirable vintage Submariner variants.

The Rolex Submariner Silver Serti Diamonds 40 mm (Ref. 16618) is a rare and luxurious version of Rolex's legendary dive watch, blending professional-grade performance with refined elegance. Crafted from 18k yellow gold, it features a stunning factory silver Serti dial set with genuine diamond hour markers and blue sapphire accents, creating a distinctive look that stands out from traditional Submariner models.

Powered by the dependable Rolex Caliber 3135 automatic movement, the watch delivers outstanding accuracy, a 48-hour power reserve, and a date display with Rolex's signature Cyclops lens. It also retains the Submariner's renowned functionality with a unidirectional rotating bezel, scratch-resistant sapphire crystal, and 300 meters (1,000 feet) of water resistance.

Discontinued and increasingly difficult to find, the Rolex Submariner 16618 Silver Serti is highly sought after by collectors for its factory gem-set dial, precious metal construction, and timeless design. It is an exceptional choice for those seeking a unique luxury sports watch with enduring value and unmistakable Rolex craftsmanship.

Gamzo & Co. is a trusted secondary-market luxury-watch dealer based in Los Angeles. We specialize in sourcing authentic, unworn and pre-owned Rolex and other fine timepieces, offering insured nationwide shipping, transparent service, and personalized attention — without waitlists or uncertainty.

WATCHES

General Information

Who is Gamzo & Co., and where is it based?

Gamzo & Co. is a luxury timepiece retailer specializing in high-end Swiss watches from brands such as Rolex, Audemars Piguet, Patek Philippe, and more. We are based in Los Angeles, California, in the heart of the Diamond District, and serve clients nationwide and internationally.

What makes Gamzo & Co. different from other companies?

We focus on delivering wholesale pricing, transparency, and personal service. Every watch we sell is carefully vetted for authenticity and condition, and we work one-on-one with clients to source specific models when needed. No guesswork — just expert guidance and trusted sourcing.

Is Gamzo & Co. an authorized dealer for the watch brands it sells?

Gamzo & Co. is not an authorized dealer. We operate in the secondary market, which allows us to offer hard-to-find, discontinued, and highly sought-after models. It also means our customers skip the waitlist, and get watches delivered right to their doors! All watches are guaranteed authentic and come with original box and papers when specified.

Ordering and Payments

How can I place an order on your website?

You can place an order directly through our website by adding the item to your cart and completing checkout. You’re also welcome to contact us directly by phone, text, WhatsApp or email to complete the transaction securely.

What payment methods do you accept?

We accept:

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  Bank wire transfers
  
  
  
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  Major credit cards
  
  
  

Please note: credit card payments incur a 4% processing fee. Bank wire transfers typically receive the best pricing.

Please contact us for alternative methods of payment, including Zelle, Venmo, and cryptocurrency.

Do you offer financing or installment plans?

At this time, Gamzo & Co. does not offer financing or installment plans, but we expect to add financing options in the near future.

Can I modify or cancel my order after it has been placed?

If you need to modify or cancel an order, please contact us immediately. Orders are processed quickly to ensure secure and timely delivery, and we therefore cannot guarantee modification or cancellation after an order has been placed.

How do discount codes work?

If a discount applies to your purchase, it will either be automatically applied to your order or provided to you as a code to enter at checkout. If you have any questions, our team is happy to assist.

Shipping and Delivery

How long will my order take to arrive?

Order fulfillment time varies depending on the product, but once payment is confirmed, orders typically ship within 2–7 business days. Please check product listings for more precise order fulfillment times. All watches are shipped via FedEx Priority Overnight.

How can I track my shipment?

Once your order ships, you will receive a tracking number so you can monitor your delivery in real time.

Is your shipping insured?

Yes. All shipments are fully insured at no cost to the customer. Delivery requires an adult signature with ID, and shipments can be scheduled for delivery at your convenience.

Do you ship internationally?

At this time, we only ship within the United States and conduct business domestically.

Brand & Authenticity

Are all Rolex, Audemars Piguet, Patek Philippe, and other luxury watches you sell guaranteed authentic?

Yes. Every watch sold by Gamzo & Co. is 100% guaranteed authentic. Each piece is carefully inspected and verified by experienced professionals before being listed or sold.  We guarantee authenticity or your money back!

Do your watches come with original box and papers?

Most watches include the original box and warranty papers, unless otherwise stated in the product description. If a watch does not include these items, it will be clearly disclosed prior to purchase.

How can I verify the authenticity of a watch I purchase from you?

You may verify authenticity by:

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  Inspecting the original warranty card and serial numbers;
  
  
  
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  Having the watch reviewed by a Rolex or authorized brand service center; or
  
  
  
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  Consulting an independent third-party watch expert.
  
  
  

We stand fully behind every watch we sell, and guarantee authenticity or your money back..

Do you sell new, pre-owned, or both?

We sell both new/unworn and pre-owned luxury watches. Condition is always clearly stated in the listing so you know exactly what you’re purchasing.

Where do you source your luxury watches from?

Our watches are sourced from a trusted global network of authorized retailers, collectors, dealers, and private clients. Every piece undergoes strict verification before entering our inventory.

Warranty

Are your new watches covered by warranty?

Yes. New watches typically include the manufacturer’s international warranty, valid from the date on the original warranty card.  All of our watches are also covered by our Gamzo & Co. one-year limited warranty.  Please see the Gamzo & Co. limited warranty page for additional information. 

What does your warranty cover, and how long does it last?

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  New watches: Covered by the brand’s factory warranty from the date on the warranty card (varies per brand, but usually 5 years for Rolex), in addition to our own two-year warranty.
  
  
  
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  Pre-owned watches: May include remaining factory warranty.  Also includes a Gamzo & Co. two-year limited warranty.  Please see the Gamzo & Co. limited warranty page for additional information.
  
  
  

Buy, Sell, Trade

Do you buy watches directly from customers?

Yes. We actively buy luxury watches from private collectors and individuals.

How do you evaluate and price a watch I want to sell or trade in?

Pricing is based on:

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  Brand, model, and reference;
  
  
  
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  Condition and completeness (box & papers); and
  
  
  
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  Current market demand and pricing trends
  
  
  

We aim to offer fair, competitive market value.

Can I trade in my current watch towards a purchase?

Yes. Trade-ins are welcome and can be applied toward watches from brands such as Rolex, Audemars Piguet, or Patek Philippe, subject to availability and evaluation.  Please contact us for a trade evaluation.

How long does the appraisal process take?

Most appraisals are completed within 24–48 hours once we receive all required details or the physical watch.

Exchanges and Returns

What is your return or exchange policy?

Due to the nature of luxury timepieces, all sales are final unless otherwise stated. Exceptions may be made at our discretion if a watch is materially misrepresented.

Are there any restocking fees on returns or exchanges?

If a return or exchange is approved, a restocking fee may apply depending on the circumstances and condition of the watch.

Who covers the shipping for returns?

Approved returns must be shipped fully insured with a Gamzo & Co. prepaid label. Shipping costs are typically the responsibility of the customer unless otherwise agreed upon.

Customer Support

How can I contact Gamzo & Co. customer service?

You can contact us by:

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  Phone or text: (213) 489-1118
  
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  WhatsApp:  (213) 824-5213
  
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  Email: sales@gamzoandco.com
  
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  Website inquiry form
  

For high-value purchases, sourcing requests, or trade-ins, we offer personalized, one-on-one assistance.

What are your support hours?

Our business hours are Monday through Friday, 9:00 AM – 5:30 PM (Pacific Time).
Messages received outside business hours will be responded to as soon as possible, but typically no later than the next business day.

Do you sell through other retailers or only your official website?

To better reach and serve our customers, we work with established platforms such as Chrono24 and eBay.  Before purchasing on a third-party platform, we recommend that you please contact us directly to confirm that you are dealing with us.

Our Diamonds

• We sell only high quality diamonds. We strive to please and believe high quality diamonds provide better satisfaction.
• We only sell conflict-free diamonds. We follow strict guidelines and standards set by the Kimberly Process. The Kimberly Process standards were  created over a decade ago to prevent conflict diamonds from entering the market. 

Diamond Appraisals:

• Every order at Gamzo & Co. comes with a third party diamond appraisal certificate from the Diamond Institute of America. 
• An appraisal includes all the details of your diamond and ensures that in the case of loss, theft, or damage your insurance company will give you an equal replacement of your item.
• We recommend our customers contact insurance agencies to insure their diamond jewelry in case of loss or theft.

30 Day Return Policy:

• We appreciate your business and are committed to you even after delivery of our product.
• We therefore offer 30 day money back guarantee returns on all jewelry orders to ensure complete satisfaction, unless specified otherwise on the product page. We also offer lifetime upgrades by exchanging your jewelry for an upgraded item. We do not offer returns on watch orders and lab grown diamonds.

Processing Times:

• Please allow us 1-5 business days for us to process watch orders and 3-15 business days for jewelry items.
• If you need an order rushed, please contact us at (213) 489-1118 to discuss how we can process your order quicker.

Free Overnight Shipping:

• We offer free overnight shipping on all orders.
• All orders are 100% insurance to provide an added safety.
• All our jewelry orders come in our beautiful Gamzo & Co. jewelry box and bag to enhance your experience.

Financing:  

• We offer several payment methods including all major credit cards, PayPal, and bank wire transfers.
• We offer financing for all jewelry orders through Affirm financing.

Customization:

• We can help you design engagement rings, eternity bands, earrings, bracelets, necklaces and all other jewelry all within your budget.
• Please call us at (213) 489-1118 to speak to our jewelry design team to discuss any custom orders.

 Prices and availability subject to change at any time and does not constitute a contract.

Free Overnight Shipping

• We offer free overnight shipping on every order.
• Every order is insured for added safety.
• Every jewelry order comes with our custom company gift bags and our jewelry boxes. 
• Every product is in a standard & discreet FedEx shipping box that won't give away what's inside.
• We offer US as well as international shipping.
• We ship with FedEx Overnight Insured signature confirmation.

Returns

• We appreciate your business and are committed to you even after delivery of our product.
• 30 day money back guarantee returns on all jewelry orders, unless otherwise specified on the product page.  We do not offer returns on watch orders.
• To request a refund, please contact us within the 30 day time frame.
• Once you request a refund, we will send you a fully insured, free shipping label via email. You can then ship the item back to us and once we receive and accept the product, we will issue you a full refund. 

We are here to help!

If you have any questions, please contact us at (213) 489-1118. 

 Prices and availability subject to change at any time and does not constitute a contract.