Guarantee Policy

Authenticity & Product Condition

At SienbyNien, we believe that fashion should feel as good as it looks — and we proudly stand behind the authenticity and quality of every timeless, pre-loved piece we offer.

Because our selection consists entirely of curated vintage and pre-loved items, each piece has its own individuality. These items are not new; they carry subtle reminders of their previous life, which is part of what makes them special. For this reason, our products do not come with a traditional guarantee as you might expect from newly manufactured goods.

Instead, we focus on clarity and honesty.
Before an item goes online, we carefully document it:

• every sign of age or wear is photographed,

• all relevant details are described transparently,

• and the overall condition is communicated clearly.

This ensures you know exactly what you’re purchasing and can appreciate your item from the moment it arrives.

Vintage pieces naturally show small traces of their history — these characteristics contribute to their charm and uniqueness. If you ever need additional information, extra photos, or a closer look at a specific detail before committing to a purchase, our team is more than happy to help.

Our goal is simple: to help you discover pre-loved treasures you’ll cherish for years, chosen with intention and sourced with respect for people and the planet.