Regular polished pieces require approximately 15 business days for production. Special finishes or special craftsmanship, including brushed finishes, complex hand finishing, decorative engraving, and other special customization require approximately 20–25 business days. Shipping takes 5–7 business days via DHL Express or FedEx. If you need your order sooner, please contact us at hello@highlinediamond.com.

Standard Made-to-Order pieces are handcrafted in the order they are placed. If you have a special deadline and need expedited production, please contact us at hello@highlinediamond.com. If our customer care team confirms that a rush request can be accommodated, the production time may be shortened by approximately 3-5 business days from the standard timeframe.

For destinations available at checkout, Highline Diamond prepays all applicable import duties and taxes. Any applicable sales tax will appear in your final order total at checkout, with no import duties due upon delivery. Local customs may occasionally request identification or additional information from the recipient.

Yes, we know the importance of a surprise. Your order ships in a plain, unmarked external box. The shipping label will not mention "Jewelry" or "Diamonds" to keep your secret safe.

Every order is shipped door-to-door via tracked DHL Express or FedEx service. Worldwide transit typically takes 5–7 business days after production, and an adult signature is required upon delivery. Complimentary delivery is available to all destinations offered at checkout, with applicable import duties and taxes prepaid.

Once your order has shipped, our system will automatically email you a tracking number. Enter this number on the corresponding carrier's website to view the latest delivery status in real time.

Yes, we offer a 48-hour grace period. You may cancel or modify your order for a full refund within 48 hours of placement.
After this window, our artisans begin the custom production process specifically for your piece, and we are unable to accept cancellations or changes. Please email hello@highlinediamond.com immediately if you need assistance.

Yes. Complimentary engraving is available on eligible pieces. Engraved items remain eligible for return or exchange; a US$40 engraving removal and refinishing fee applies to each engraved item.

We strongly advise against using string or paper strips as they are often inaccurate. For the most precise fit, please visit our Size Guide to order an official sizer or view detailed measurement instructions.

We want your ring to fit perfectly.
We offer one complimentary resizing within 30 days of delivery for eligible styles, allowing adjustments up or down by up to 2 sizes. Customers are responsible for shipping the piece to our studio, and Highline Diamond covers the express return shipping after resizing. Because some intricate designs cannot be resized, please confirm your ordered size carefully. Email hello@highlinediamond.com for instructions.

Our warranty permanently covers any manufacturing defects. Additionally, eligible side stones weighing 0.10ct or less are covered for replacement when lost due to a manufacturing defect or normal setting issue.(Note: Warranty does not cover lost center stones, stones greater than 0.10ct, accidental damage, or severe wear.)

Standard Made-to-Order and Ready to Ship pieces may be returned or exchanged within 30 days of delivery. Refunds are subject to a Return Processing Fee equal to 10% of the amount actually paid, capped at US$300 per return; this fee does not apply to exchanges. Customers cover shipping to Highline Diamond. For exchanges, we cover shipping of the replacement item back to you, with applicable duties and taxes prepaid. Complimentary delivery does not include shipping items back to Highline Diamond.

For an exchange to a higher-priced item, the balance must be paid before shipment. If the replacement item is lower in price, the difference will be issued as store credit.

Engraved items remain eligible with a US$40 engraving removal and refinishing fee per item. Fully bespoke pieces and items significantly damaged after delivery are not eligible; minor surface scratches alone do not disqualify an item. Any IGI grading report supplied with the item must be returned, or a US$100 replacement fee will apply per missing report.

Please see our full Returns & Exchanges Policy for complete details.

To keep your jewelry sparkling, we recommend removing it before showering, sleeping, exercising, or applying lotions.
For a quick clean at home, simply use warm water, mild dish soap, and a soft toothbrush to gently scrub your piece.
For detailed instructions on specific stones and maintenance, please visit our [Jewelry Care Guide].

Yes! Lab grown diamonds, also known as laboratory grown diamonds or ethical lab grown diamonds, are chemically identical to mined diamonds or natural diamonds. They offer the same level of beauty and are an extremely popular choice.

The only difference between a mined diamond and a lab grown diamond is their origin. Lab grown diamonds are an ethical and sustainable option, offering the same fire, clarity, and carat weights as mined diamonds.

Lab grown diamonds are a sustainable option, created using advanced technology under high pressure, which is much more ethical than traditional diamond mining methods.

Highline uses lab-grown diamonds selected to our D–F color and VS+ clarity standards. Individually certified diamonds of 1.00ct and above are accompanied by an IGI grading report and laser inscription. Smaller pavé and accent diamonds are quality-matched but are not individually certified unless expressly stated.

You don't need to stress over the 4Cs because we’ve already done the hard work. We only curate the top 5% of the pyramid:

• Color: D/E/F (Colorless) only. No yellow tints.
• Clarity: VS+ (Eye Clean) only. No visible inclusions.
• Cut: Ideal/Excellent only. No light leakage.