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Can I cancel or edit my order once it has been placed?

Please send us an email to with your order number within 24 hours if you would like to cancel your order. We will try our best to accommodate you. Unfortunately we cannot add or subtract items from orders once they have been placed.

What if I receive the wrong product?

Please contact us at with your order number within 24 hours of receiving your order. We want to make sure you receive the pieces you ordered.

Do you offer exchanges for damaged items?

We meticulously inspect each piece and pack it with care to ensure each order is received in the exact condition it left SINKU. Sometimes things happen, and we want to be sure you are elated with your piece. Please contact us immediately at along with your order number for assistance.


What are your delivery times?

Most of our pieces are made to order. Depending on the piece, please allow about 5-30 business days to make the jewelry, plus shipping time. Please allow more time during the holiday season. Orders placed over the weekend and on holidays are fulfilled the next business day.

COVID-19 Delays: We have seen shipping delays after packages leave our studio. Please allow up to 15 days for shipping.

How much will shipping cost?

Shipping information and costs are listed on our checkout page.

Can I change my shipping address?

Once an order is placed you cannot change your shipping address. The best way to have an order shipped to another address is to email within 24 hours of placing your order, request to cancel your order (please include your order number), and then place another order.

Do you provide worldwide shipping?

Yes, we are able to ship worldwide. Will you be the first in your country to wear SINKU?

For international orders, the clients are responsible for import duties and taxes on your order depending on the country in which you reside. Please contact your customs office for additional information. There can be occasional customs or courier delays which may affect your delivery timeframe. Unfortunately we cannot control such circumstances.

So, I think my order is lost...

If you think your package is lost, email us right away with your order number at and we will try our best to resolve the issue. Please note that SINKU is not responsible for lost or stolen items once your order is marked "Delivered" by the delivery courier. Please also check with your neighbors or the concierge to see if they may have accidentally picked up your package. 


What is your return policy?

We have a 7 calendar day return policy, which means you have 7 calendar days after receiving your item(s) to request a return. We will determine if the piece is eligible for a full refund once it arrives to our studio.

To be eligible for a return, your item(s) must be unworn, with tags, diamond certifications (if applicable), and in its original packaging. The packing slip must be included with your return.

All returns are subject to a 15% restocking fee.

Custom orders and engraved items are final sale and cannot be returned or exchanged.

We do not accept returns or exchanges for international orders.

How do I initiate a return?

To start a return please contact us at We want to make sure we are expecting your return. If your return request is accepted, we will provide you with a return shipping label. Items sent back to us without a return request will not be accepted.


What materials do you use?

We use fairmined or recycled gold, carbon neutral diamonds, lab grown diamonds, and occasionally ethically sourced precious and semi-precious stones. We ensure each manufacturer we partner with employs the high ethical standards we hold ourself to. Our manufacturers abide by the Kimberly Process, SCS Standards, or Green America.

What are carbon neutral diamonds?

Carbon neutral diamonds are diamonds that meet the highest standards of ethical and environmental responsibility, by protecting people and the planet. SCS-007 Jewelry Sustainability Standard – Sustainability Rated Diamonds is the first comprehensive sustainability standard developed for the diamond sector, that satisfies this demand.

This groundbreaking certification standard applies to both natural and laboratory-grown diamonds. The standard establishes unprecedented benchmarks of performance and transparency, featuring: 1) stringent environmental, social and governance (ESG) achievement; 2) climate neutrality; 3) sustainable production practices with net zero impact; 4) comprehensive origin traceability for the highest possible source-to-market certainty; and 5) sustainability investments that support vulnerable communities, reduce net impacts further, and contribute to a safer world. All of this is backed by independent, third-party certification.

Is your packaging sustainable?

Absolutely, and we encourage you to keep it going. Our beautiful packaging is made from paper, so you can either reuse or recycle it.


Do you offer wholesale opportunities?

For wholesale inquiries please email