Introduction: Why Rough-Diamond Sales Changed Forever
In the latest Rapaport Diamond Podcast, Adam Schulman, founder and CEO of Koin International, explained how tenders and auctions reshaped rough-diamond sales. Before tenders became common, miners relied on informal, over-the-table deals. As a result, prices often stayed flat and buyers controlled the market.
During the conversation with Joshua Freedman, Schulman shared how competition improved transparency and why miners now prefer tenders. Because of these changes, auctions and tenders dominate the global trade today.
From Private Bags to Transparent Tenders
For decades, dealers bought rough diamonds in closed rooms, carrying bags of stones and making quick offers. While this approach worked for some, it lacked transparency. Therefore, Schulman saw a gap in the system.
- 2005: He co-founded Fusion Alternatives with I. Hennig. Since it was the first independent tender platform, it allowed small and mid-sized miners to reach more buyers.
- 2015: He launched Koin International to expand the model. After its success, tenders became the preferred sales method.
- Today, over 70% of rough diamonds are sold via tenders or auctions.
At the same time, De Beers and Alrosa continued their sight system. Yet miners shifted toward tenders because they could secure stronger competition and higher prices.
Learn more: How Diamond Auctions Work.
Q&A with Adam Schulman
Q: Why did tenders change the market?
A: Before tenders, miners often had no choice but to accept fixed offers. After tenders gained traction, they attracted hundreds of buyers and achieved 10–15% higher prices.
Q: Why did Koin relocate from Antwerp to Dubai?
A: “During Covid-19, Antwerp became difficult for global access. Meanwhile, Dubai offered lower tax, better logistics, and faster growth,” Schulman explained.
Q: Are tenders the new standard?
A: “Yes. Over time, tenders proved more transparent and competitive, so miners prefer them.”
The Business Impact of Tenders
Because miners wanted fair pricing, tenders delivered results. For example:
- In early Koin tenders, small miners gained 20% more revenue compared to direct deals.
- Dubai now accounts for 40% of global rough-diamond trade, proving its rise as a key hub.
- Koin hosts more than 20 tenders each year, drawing buyers from India, Belgium, Israel, and the UAE.
See also: Why Dubai Became a Diamond Hub.
Adam Schulman Beyond Diamonds
After years of building Koin, Schulman still finds time for his passion: photography. While leading diamond tenders, he also captures wildlife across deserts and safaris. His work appears on Instagram at @adam_s_photography.
For inspiration, explore Gemstone-Inspired Photography.
Adam Schulman, CEO of Koin International, joined the Rapaport Podcast to explain how tenders and auctions changed rough-diamond sales. From Antwerp to Dubai, the shift introduced transparency, competition, and better prices for miners. Today, auctions dominate because they bring more buyers and fairer results.
Suggested Reading:
Guide to Diamond Market Trends
History of Rough-Diamond Trading
This Indian Western jewelry guide offers clear answers on styles, buying, and care. Whether you prefer traditional Indian jewelry or modern Western designs, following these tips ensures your collection stays stylish, safe, and long-lasting.
Welcome to this Indian Western jewelry guide. Here, you’ll explore popular styles, key differences between Indian and Western jewelry, and practical buying tips. This guide helps you choose pieces for daily wear, special occasions, and gifts.
General Jewelry FAQ
How do you choose jewelry for daily wear?
Pick practical pieces such as gold studs, silver hoops, or a thin chain. They work well with everyday outfits and last longer with minimal care.
What should you check before buying jewelry?
Check gold for official hallmarks and silver for 925 purity marks. These details prove quality and help you avoid poor purchases.
How do you care for jewelry at home?
After each use, wipe items with a soft cloth. Store them in pouches to avoid scratches, and keep them away from perfumes and water to preserve shine.
Does jewelry make a good gift?
Yes. Silver bracelets suit birthdays, while gold earrings or bangles are ideal for weddings and anniversaries.
Indian Jewelry FAQ
Popular Indian Jewelry Types
What are the main types of Indian jewelry?
Kundan, Jadau, Temple, Polki, and Meenakari are all popular. Each style has unique appeal and occasions for wear, as explained in this Jewelry FAQ Indian Western.
When should you wear heavy bridal jewelry?
Heavy sets are perfect for weddings, receptions, and major festivals. For smaller events, opt for lighter earrings or slim chains.
Indian Bridal Jewelry
What makes Kundan and Polki bridal jewelry different?
These handcrafted sets combine earrings, necklaces, and bangles, offering intricate detail and uniqueness.
Should you buy a full bridal set or separate pieces?
A full set works best for weddings, while single pieces offer more flexibility for repeated use.
Indian Jewelry Care
How do you care for Kundan and Polki jewelry?
Store in soft-lined cases, avoid water and sprays, and gently wipe with a dry cloth.
Can you clean antique jewelry at home?
No. Antique pieces are delicate and should be cleaned by a professional jeweler.
Do Indian designs work with Western fashion?
Yes. A Polki choker can pair with a gown, and Jhumkas can enhance jeans. Mixing styles shows why this Jewelry FAQ Indian Western is popular.
Western Jewelry FAQ
Western Jewelry Styles
What defines Western jewelry?
Cocktail rings, layered necklaces, minimalist chains, and bold hoops. Western jewelry often follows seasonal trends.
Why is silver popular in Western fashion?
Silver is stylish and affordable, suitable for both formal and casual wear.
Layering Techniques
How should you layer necklaces?
Start with a choker, add a mid-length chain, then finish with a pendant for balance.
Workwear Jewelry
What jewelry works best in an office?
Simple diamond studs, light hoops, or thin gold chains. One statement piece is fine; avoid stacking multiple bold items.
Seasonal Jewelry
Should you follow seasonal jewelry trends?
Yes. Seashell styles fit summer, pearls suit autumn, and heavy cuffs work well in winter.
Buying and Styling Jewelry
Choosing Between Gold and Silver
How do you decide?
Gold flatters warm undertones, silver suits cool tones.
Is costume jewelry worth buying?
Yes, especially for short-term styling or festivals.
Mixing Indian and Western Styles
How should you store mixed jewelry?
Use a box with separate slots for gold, silver, and imitation jewelry to avoid scratches.
Can Indian and Western styles be mixed?
Absolutely. Silver hoops with sarees or gold bangles with evening gowns create a bold fusion look.
Professional Guidelines
What is ideal for office wear?
Stud earrings, fine bracelets, and slim chains keep you elegant and professional.
Jewelry Care and Storage
How do you clean silver jewelry?
Use a silver cleaning cloth or mild soap water, rinse, and dry completely.
How should you maintain gold jewelry?
Store in velvet-lined boxes and avoid perfumes or sprays.
How should jewelry be carried while traveling?
Use a travel box with separate slots to prevent tangling and damage.
This Indian Western jewelry guide offers clear answers on styles, buying, and care. Whether you prefer traditional Indian jewelry or modern Western designs, following these tips ensures your collection stays stylish, safe, and long-lasting.