Edahn Golan Diamond Research & Data is an independent market intelligence and analysis service specialising in the diamond industry, produced by the Israeli-American analyst and journalist Edahn Golan. The service is widely regarded as one of the more rigorous non-promotional sources of data on the diamond pipeline, covering rough and polished pricing trends, supply-chain dynamics, trade flows, and consumer demand across the principal diamond-consuming markets. Its reports are regularly cited in trade publications including Rapaport, JCK, and National Jeweler, and are used by manufacturers, dealers, rough-diamond miners, and investors engaged in strategic planning.

Background and Scope

Edahn Golan began his career as a diamond-industry journalist and analyst, developing a methodology that combines publicly available trade data — including import and export statistics from the United States, India, Belgium, Israel, Hong Kong, and the United Arab Emirates — with proprietary surveys, interviews with industry participants, and longitudinal tracking of polished-diamond price indices. The resulting output occupies a distinct position in the information landscape: unlike data published by mining companies or trade associations, which may carry institutional interests, Golan's research is positioned as editorially independent and data-driven.

The service publishes a range of report types, from monthly and quarterly pipeline analyses to bespoke research commissioned by industry clients. Subscribers include participants at multiple levels of the diamond value chain, from rough producers and cutting centres to retail jewellers and financial analysts with exposure to diamond-sector equities.

The Diamond Pipeline Framework

A central organising concept in Edahn Golan's analytical work is the diamond pipeline — the sequential stages through which a rough diamond travels from mine to consumer. These stages broadly comprise:

• Rough production and sales — output volumes and pricing from major producers, including De Beers sight allocations and ALROSA tender results.
• Cutting and polishing — primarily centred in Surat (India), Antwerp, Tel Aviv, and increasingly in Botswana and other producing nations.
• Polished wholesale trade — tracked through import/export data from key trading hubs.
• Retail demand — consumer purchasing trends in the United States, China, India, and the Gulf states, often disaggregated by diamond category (bridal, fashion, investment).

By tracking inventory levels, price spreads, and trade volumes at each stage simultaneously, the reports aim to identify structural imbalances — such as rough oversupply relative to polished demand, or inventory accumulation in the midstream — before they are reflected in publicly quoted price indices.

Pricing and Index Coverage

Edahn Golan's reports engage closely with the principal polished-diamond price benchmarks, including the Rapaport Price List and the IDEX Online Polished Diamond Price Index, while also contextualising these against actual transaction data where available. A recurring analytical theme is the divergence between list prices and achieved transaction prices — the so-called discount-to-Rap — which can vary substantially by category, size, and market conditions. Reports have documented, for instance, the pronounced compression of polished margins during periods of rough-price inflation, and the downstream effects of shifts in rough tender pricing by the major producers.

The service has also tracked the emergence of laboratory-grown diamonds as a structural market force, publishing data on the rapid decline of laboratory-grown polished prices relative to natural diamonds and analysing the implications for manufacturers who have invested in both segments.

Laboratory-Grown Diamonds and Market Disruption

Among the more consequential analytical contributions of recent years has been Edahn Golan's sustained documentation of the laboratory-grown diamond sector's growth and its pricing trajectory. His data, drawn from US import statistics and retail survey work, has provided some of the clearest publicly available evidence of the speed at which laboratory-grown polished prices have declined — in some categories by more than 80 per cent between 2020 and 2024 — and of the growing price differential between laboratory-grown and natural diamonds of equivalent graded characteristics. This research has informed debate within the trade about positioning, disclosure, and the long-term value proposition of natural diamonds.

Relevance to Investors and Strategic Buyers

For those approaching diamonds as an investment or as a significant capital allocation — whether as individual collectors, family offices, or institutional buyers of high-value stones — Edahn Golan's reports offer a form of market context that is difficult to obtain from promotional industry sources. Key areas of relevance include:

• Identification of periods of rough-price inflation that may subsequently compress polished values at retail.
• Tracking of inventory cycles that influence the liquidity of polished diamonds in the secondary market.
• Consumer demand data disaggregated by geography, which affects the relative strength of different diamond categories over time.
• Analysis of structural shifts — such as the rise of laboratory-grown diamonds or changes in bridal purchasing patterns — that may affect the long-term demand for natural stones.

It should be noted that diamond market intelligence, however rigorous, cannot substitute for independent gemological certification of individual stones, nor for the due diligence appropriate to any significant purchase. Reports of this kind are most usefully read as macroeconomic and structural context rather than as guidance on the value of specific gems.

Limitations and Critical Considerations

As with any market intelligence service, certain limitations apply. Diamond trade data, particularly at the polished level, is notoriously difficult to compile comprehensively: a significant proportion of transactions occur privately, and declared import/export values do not always reflect true transaction prices. Survey-based consumer data carries the methodological uncertainties inherent to that form of research. Edahn Golan's work is generally transparent about these constraints, but readers should approach any specific price or volume figure as an informed estimate rather than a definitive measure. The service is also, by its nature, focused on the diamond industry specifically; it does not cover coloured gemstones or broader jewellery market dynamics in comparable depth.

Further Reading

• GIA Gems & Gemology — industry and market research articles
• American Gem Trade Association — market reports and trade data