Diamond Week 2026

20% Off Diamond Collection

Diamond Week is our Black Week for diamonds and runs from October 29 to November 8.*

DIAMOND WEEK · 29/10-8/11

20% off diamond jewelry*

Diamond Week marks the beginning of our Black Week campaign. From October 29 to November 8, we’re putting the spotlight on the Diamond Collection, giving you the opportunity to find a diamond piece for a special moment.
The discount will remain the same throughout Black Week, so there’s no need to wait. Order by November 8 for guaranteed delivery before Christmas, even if your jewelry needs to be made first**

*The discount cannot be combined with other offers and does not apply to wedding bands and bespoke designs. The discount code is valid through November 30.
**If your jewelry is delayed and does not arrive before Christmas, you will be compensated.

20% off engagement rings*

You’ve found the one. Now you just need the ring.

Still looking for the right engagement ring? Diamond Week is the perfect time to find it.
Explore our lab-grown diamond engagement rings, designed for the big question and made to be worn for years to come.

*The discount cannot be combined with other offers and does not apply to wedding bands and bespoke designs. The discount code is valid through November 30.

Visit Our Showroom in Copenhagen

Experience our Diamond Collection and wedding bands in our physical store in the heart of Copenhagen. Our team is ready to assist you with questions and personal guidance, so you can find the perfect diamond piece.

EXPLORE OUR GUIDES

Engagement Ring Guide

Learn more about shape, size, style, and materials, and discover our selection of classic and modern engagement rings.

Wedding Band Guide

A comprehensive guide covering our ring profiles, materials, engraving, and much more.

About Our Lab-Grown Diamonds

Want to know more about our diamonds, general diamond terminology and how to grade diamonds? Read more in the guide here.

From Trustpilot
Sisi Copenhagen is everything I would expect a jewelry shop to deliver, prompt customer service either by email or in person, fair prices and beautiful lab grown diamonds and amazing detail and care in how they package the items. My go-to shop if I want to pamper myself or a loved one - worth every penny!
— Maria
In few words, absolutely amazing experience. I wanted a custom made engagement ring and needed assistance with finding out and deciding on how should the ring look like. I had an initial idea and needed it to be refined. Everyone I have talked with has been very helpful, starting with shop visit and getting initial idea refined, through receiving the first design that gave a very clear picture on how the final product will look like. With continuous assistance from Emma on my multiple questions and assistance in choosing the right size, that has led to amazing results. (The ring and proposal itself :)) ) Also the prices has been very friendly and competitive from the small research I have done. Definitely recommend.
— Patrik
Great selection of high quality jewelry - every piece is so beautifully crafted and I love wearing them every day. The customer service is also exceptional, fast shipping to Germany and really nice packaging as well. It's obvious that they are doing their job with love and compassion. This wasn't my first order and definitely won't be my last one. Highly recommend!!!
— Sarah S.
I love their jewelry. They also custom made my fiance's wedding band and it came out perfectly. They are a pleasure to talk to and work with and I'd recommend them a hundred times.
— Jillian

Explore Our Other Jewelry

In addition to our exclusive Diamond Collection, our jewelry universe includes many other beautiful collections. We work with a variety of materials, textures, and styles, so you can find the perfect pieces that reflect you and your personal jewelry style.

Visit our Brand Store

Rosenborggade 1B
1130 København K

Mon-Fri, 10:00 AM - 5:30 PM
Saturday, 10:00 AM - 3:00 PM
Sunday, Closed