From this, we command a reliable reputation, as a trusted partner with a flawless record.
We sell more than just premium stones. By choosing Windiam, we help you to buy with our expert knowledge cultivated over three generations of diamond trading. Our expertise helps you thrive in a changing marketplace to ensure your business profits.
Our stock is updated in real-time, so you’ll always know what we have. While many our stones are HRD and GIA certified; we can source nearly any kind of polished diamond you wish for.
We are your specialist wholesalers in Baguette diamonds for watch and jewellery manufacturing.
In today’s ultracompetitive market, you need your partner to deliver premium diamonds in the shortest lead time possible. Our global logistics partners (and sometimes even us!) deliver your diamonds when you need them.
Our influential network connects to the best gemologists, artisans and manufacturers of the major world cities. If you need a specific advice or service, we’ll match you with the person or company you need. We nurture our network for your business growth.
Call us to find out more about our polished services here.
Our rough sourcing, polished expertise and optimised production experience meet your customer’s desires in our typically valued manner. When large and expensive stones are required, we’ll allocate rough stones to meet your specific demands.
Windiam understands the more diamonds your customers can inspect before purchasing the more your sales increase. That’s why we’ll loan you the premium diamonds you want on credit, interest-free.
If you have an unsatisfied customer and need to buy back a stone, we’ll offer you financial support as and when required.
Educate Your Team
Tours of the diamond market improve your understanding of how the top traders operate. Technical training in diamond sorting including the correct use of an eye loupe and Sortoscope. Applying this product knowledge back home will help you stand out in today’s ultra-competitive business.
Presenting your collections externally (e.g. trunk shows) is an excellent way to build your brand. We’ll support you by taking your event to the next level with one of our representatives and a premium stones collection.
We can provide you with certified diamonds. Sealed or laser inscribed from the distinguished Hoge Raad voor Diamant (HRD) or Gemological Institute of America (GIA) laboratories.
Call our Antwerp head office to find out how our 360 program can benefit your business.
We work daily with state of the art technology
Meet the M-Screen
A precise, automated melee device that screens round brilliant diamonds from 1.0 millimeter till 20 points for possible lab grown ones, or potential HPHT colour enhancement and simulants.
The technology eliminates the risk of receiving compromised goods.
This French company have developed an automated optical dimensional control system for round melees diamonds. With its precise cut quality control, it delivers on your specific measurements.
As a preferred partner for many luxury watches and jewellery houses, we save you time and money by:
Both machines have been in operation since 2016 at our Antwerp headquarters. Alongside our in-house sorting team, these investments help optimise your search for the perfect diamonds.
Ask us more or arrange a tour of our technology by calling our Antwerp head office here.
Windiam Director / Owner
“At Windiam, we don’t just buy and sell diamonds. We give all companies the resources and tools they need to thrive.When our clients succeed, we succeed.My favourite part of work is celebrating my client’s success, whether it’s a large sale or the launch of a collection. The relationships we foster are particularly gratifying. I get to know their stories, understand their challenges and learn about their aspirations. These personal relationships drive our business. We are trusted advisors to our clients not just because of our knowledge but because we care about your needs.”
Gon Raz is a 3rd generation diamantaire bringing the heritage and impeccable reputation of his grandfather Dov and father Amos Raz who were among the founders of the Israeli Diamond Exchange.
To speak to Gon, contact our Antwerp head office here