Diamond Nexus Coupon Codes

We regularly check the coupons and deals and update them when offer details change.

Checked October 2026

7 Coupon Reveals

How We Verify

We may earn a commission from purchases made through our links.

  • $100

    OFF

    Promo

    Sign Up & Get $100 Off First Order $700

    1+

    People Viewed this Deal

  • UP TO

    70%

    OFF

    Promo

    Up to 70% Off Sale

    1+

    People Viewed this Deal

  • FREE

    SHIPPING

    Promo

    Free Shipping On All US Orders

    1+

    People Viewed this Deal

  • 20%

    OFF

    Promo

    Buy Ring, Get 20% Off Wedding Band

    2+

    People Viewed this Deal

    Details

    Buy an Engagement Ring & Save 20% On Any Wedding Band Purchase 

  • $100

    Promo

    Fine Jewelry From $100

    1+

    People Viewed this Deal

  • $125

    Promo

    Wedding Rings from $125

    1+

    People Viewed this Deal

Frequently Asked Questions

What is Diamond Nexus's return window?

Items can be returned within 30 days of receiving your order for an exchange or a full refund, and returns must be postmarked within that window. Starting a Return Merchandise Authorization (RMA) request through your My Account Dashboard is the first step, after which US and Canada customers receive a shipping label and packing slip.

 

What condition does an item need to be in for a return?

All returns must be unworn and in new condition, with all original packaging and documentation included. Returns with missing items carry a minimum $25 charge, so keeping everything that arrived, boxes, certificates, and inserts, together until you're sure about keeping the piece protects the full refund.

 

Does Diamond Nexus offer free resizing?

Yes, a one-time complimentary resizing is available within the first year from the date of shipment, accommodating up to two full ring sizes from the original. Non-precious metals like tungsten and titanium, along with eternity bands, can't be resized at all, so this is worth checking before ordering one of those styles in an uncertain size.

 

What does the lifetime stone guarantee cover?

Diamond Nexus guarantees its Nexus Diamond Alternative and moissanite stones for life against chipping, cracking, and discoloration with regular care, and will replace a stone at no cost if there's ever an issue. This guarantee is voided if a piece is serviced or the stone is set by a jeweler other than Diamond Nexus.

 

Are repairs due to normal wear and tear covered?

No, repairs due to wear and tear, lost stones, or product loss and theft aren't covered under the standard warranty. Diamond Nexus specifically recommends purchasing a protection plan through a third-party provider to cover accidental damage and loss beyond what the manufacturing and stone warranties address.

 

How does store credit work if I choose that over a refund?

Store credit issued from a return is valid for 3 years from the date of issuance, though credit older than 90 days becomes non-refundable, meaning it can't later be converted back to cash. Existing credit approaching the 3-year mark gets a 6-month grace period, so using it well before that window closes is the safer approach.

 

Are international orders covered by the standard return policy?

No, international orders and select other items aren't covered under the normal returns and guarantees policy. Checking a specific item's return eligibility before ordering matters more for international shoppers than for domestic ones.

 

Does Diamond Nexus offer free shipping?

Yes, US orders over $100 ship free with no signature required. Additional fees for shipping upgrades are non-refundable even if the order is later returned.

 

Saving Guide

Using the Full 30 Days to Confirm Your Choice

Because the return window gives a genuine month to see and wear a piece before deciding, trying a ring on in different lighting and daily situations, rather than judging it the moment it arrives, makes full use of a policy designed around exactly that kind of consideration. Keeping all original packaging intact throughout this period protects the ability to return it cleanly if needed.

Choosing a Ring Size Carefully to Preserve Resizing Coverage

Since the complimentary resizing covers up to two full sizes within the first year but excludes non-precious metals and eternity bands entirely, getting professionally measured before ordering matters most for those excluded styles, where there's no built-in safety net if the size turns out wrong.

Setting Your Own Jewelry Rather Than Using an Outside Jeweler

Because having a stone set by anyone other than Diamond Nexus voids the lifetime stone guarantee, choosing Diamond Nexus's own setting service for loose stones, rather than a local jeweler, preserves the full warranty value that's part of what you're paying for in the first place.

Weighing a Third-Party Protection Plan for Accidental Damage

Since the standard warranty explicitly excludes wear and tear, loss, and theft, and Diamond Nexus itself recommends third-party protection for these gaps, adding a separate insurance policy is worth considering for a piece that will see daily wear, particularly an engagement ring, where accidental loss is a real risk the manufacturer's warranty won't cover.

Using Store Credit Before It Ages Past 90 Days

Because store credit older than 90 days can no longer be converted back to a refund, spending an issued credit on a next purchase relatively soon, rather than letting it sit, protects its full flexibility. Watching for the 3-year expiration and its 6-month grace period is also worth doing if a credit has been sitting for a while.

Clearing the $100 Free Shipping Threshold

Since free shipping applies at $100 with no signature required, most jewelry purchases from Diamond Nexus clear this line naturally, making it less of a consideration than at retailers with higher thresholds, though it's worth confirming on a smaller accessory purchase.

Before You Check Out Checklist

Get professionally measured for ring size, especially for non-precious metals or eternity bands that can't be resized, keep all original packaging intact through the 30-day window, use Diamond Nexus's own setting service rather than an outside jeweler to preserve the lifetime stone guarantee, and consider third-party protection for accidental damage or loss not covered by the standard warranty.

How We Verify Coupons

Tested Before Publishing

We manually test codes at checkout to confirm the advertised discount applies.

Clear Offer Conditions

We list minimum spend, eligible items, expiration dates, and other restrictions.

Backed by Screenshots

We capture checkout screenshots to show the savings confirmed during testing.

Updated Daily

We review offers daily, recheck reported codes, and remove expired or invalid coupons

See Our Full Verification Process

DMC collects & utilizes cookies from third-parties & affiliate networks to improve user experience. If you buy a product or service after clicking on one of our links, we may get a commission.