The trusted name in diamond tenders

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Upcoming Sales


10–15 Dec 2023

Close: 15 Dec @12:00 GST

DDE Tender Floor, Dubai
10–13 Dec

Original Zimbabwe rough production (few hundred thousand cts) from melée through 10.80ct+ single stones, ROM, and assortments.


11–15 Dec 2023

Close: 15 Dec @12:00 GST

DDE Tender Floor, Dubai
11–14 Dec

Presenting a sale of SAR & ANGOLA productions from melee through 10.80ct+ single stones.

LGT003 : Crysdiam Lab Grown Rough Sale

10–13 Dec 2023

Close: 14 Dec @12:00 GST

Koin DDE, Dubai
10–13 Dec

Crysdiam Lab-grown roughs and 4PS. Ranges from 3ct to 30cts.

Our Numbers

Since 2015, we have achieved record-breaking sales year on year.
Our numbers speak for themselves.

Carats Sold

Sales Held

Global Locations

Our Services

Koin International is a global leader in diamond tenders and sales, and one of the top tier tender houses in the Dubai Diamond Exchange. By combining our experience, expertise, innovation and passion with a long-term investment in our relationships, we deliver the best possible solutions for our suppliers and buyers. With our proven track record and methodology, partnering with Koin means we are committed to your success.

Diamond Tenders & Auctions

We hold regular sales in Dubai,  representing rough suppliers from mines and large scale rough producers, to smaller artisanal “diggers”. Bidding is via our secure online bidding platform.

Rough Sorting & Evaluation

Our experienced team is skilled at advising on and creating the best possible assortments in order to create attractive and competitive parcel lots. 


Most Koin sales are conducted at the DDE’s highly secure and state-of-the-art viewing facilities with capacity for up to 40 viewing rooms, or in our own private viewing offices. 

Our Team

Koin draws on years of irreplaceable hands-on experience within the industry, with a team who together combine over 95 years of experience in almost every area of production from source to retail. Our passion and expertise, along with the strategic relationships we build with our clients, is the driving force behind our success.

Adam Schulman


Internationally renown for spearheading the development of rough and polished diamond tenders over the past 20 years.

Martin Gill


Extensive experience and expertise in buying, pricing and assorting, assessing and adapting to market volatility.

Our Story

At Koin, we don’t just sell diamonds. We are one chapter in the life of a diamond from its creation deep in the heart of the earth, to its final transformation as a sparkling symbol of eternity. At every step along the way, we are invested in the people who bring this story to life — our suppliers, our buyers, and our staff.

The Koin story isn’t just about diamonds. It’s also about the relationships we build. It’s about trust, integrity, commitment and respect. It’s about how to carry the story forward, together.

Our News

Keep up with what’s going on at Koin through our social media and news.

Happy Hanukkah to all our Jewish clients. 🕎🥳 ...

Upcoming Koin Crysdiam Lab Grown Tender in Dubai from 10 to 13 December. 💎
Spaces are limited, book your appointments now! ✨

For bookings, email us at or drop us a message on WhatsApp at +971 58 561 0203.

Spaces are limited, book now! ✨ ...

Upcoming Koin tender in Dubai from 11 to 14 December. 💎

Spaces are limited, book now! ✨

Happy UAE National Day 🇦🇪🎉 ...

Upcoming Zimbabwe Rough Sale in Dubai from 10 to 14 December. 💎

For bookings, email us at or send us a message on WhatsApp at +971 58 561 0203. ✨

Ekapa Mine Conveyor Belt
Koin Rough Diamond
Rough natural dIamonds from source
Koin rough natural diamonds




+ (971) 58 561 0203


43A Almas Tower
JLT, Dubai, UAE