Slate and Tel Promo Codes & Coupons June 2026

The "Invalid promo code" error on Slate & Tell often occurs because newsletter codes like the $10 off are single-use or tied to your email signup, expiring after first redemption or within 30 days. Codes shared publicly or copied with hidden characters from emails are common culprits.

Slate & Tell's jewelry checkout at slateandtell.com follows strict promo conventions: newsletter perks target new subscribers only and may exclude sale items or custom rings. Other common scenarios include pasting from mobile email apps that add invisible spaces, or codes deactivating during sitewide events like seasonal lab diamond promotions.

To fix the issue, try these steps:

1. Log out and back in to refresh your account-linked code.
2. Paste the code into the dedicated "Promo Code" field before payment — it appears below the subtotal, not with gift cards.
3. If the error persists, email support@slateandtell.com with your signup confirmation; they typically reissue valid codes within 24 hours.

Keep in mind that codes may expire after 14–30 days or become void during flash sales. A minimum $100 cart is generally required for the $10 off to apply.

Pro tip: Always test codes in an incognito browser to avoid cookie conflicts from prior sessions.

Yes, Slate & Tell promo codes frequently fail on engagement rings during sitewide sales or for lab diamond items. These categories often trigger exclusions designed to protect margins on high-value custom pieces, and shoppers commonly encounter "Code not applicable" errors specifically for lab-grown diamonds above a certain price threshold.

Slate & Tell promotions such as 10–20% off may apply broadly but tend to exclude custom and lab collections as well as items already marked down in an active sale.

To work through the issue, follow these steps:

1. Remove any sale or lab diamond items from your cart and test the code on eligible non-custom pieces like bands.
2. Enter the code at checkout after shipping is calculated but before payment is submitted.
3. If your subtotal qualifies, contact live chat — they may be able to apply a manual override for first-time buyers.

Note that promo codes are generally valid for US orders only and may expire within 60 days of the original email.

Pro tip: Check the exclusions listed in the promo's terms before building your cart, and verify eligibility in the cart preview before proceeding to checkout.

Slate & Tell does not allow stacking the $10 newsletter code with a gift card. Attempting to use both typically triggers a "Promo ineligible with other discounts" error, as gift cards are treated as prior credits and the system limits orders to one discount per transaction.

Their checkout prioritizes one promo per order. Newsletter codes apply to the subtotal, but combining them with a gift card will void the stack — a standard practice for jewelry retailers managing redemption controls.

Here's how to work around it:

1. Decide which discount offers greater savings before checking out.
2. Apply your gift card in the dedicated "Gift Card" field, which is separate from the promo code box.
3. If you want to use both, consider splitting your purchase into two orders — use the newsletter code on one and the gift card on the other. Orders over $200 typically qualify for free shipping.

Pro tip: Compare your total savings before committing — on larger purchases like engagement rings, a gift card often yields better value than the flat $10 off.