Rough Diamonds

Diamond yield comparison between rough and polished diamond

Diamond Yield: How Much Rough Becomes Polished

Diamond Knowledge, Gemology, Rough Diamonds /

SummaryDiamond yield shows how much rough stone becomes a polished gem. Understanding diamond yield helps you estimate final weight, maximize value, and avoid mistakes. Introduction Understanding diamond yield is key when buying or cutting rough diamonds. Yield is the percentage of a rough stone that turns into a polished diamond. A 10-carat rough rarely becomes […]

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Adam Schulman, CEO of Koin International, speaking on Rapaport Podcast about rough-diamond tenders

Rapaport Podcast: How Adam Schulman Changed Rough-Diamond Sales Through Tenders

Diamond News, Market Trends, Podcasts, Rough Diamonds /

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

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