Semafor84%

De Beers halts S. Africa mine output 68%

By Tom Chivers87%

7/13/2026, 11:14:09 PM

BS Summary: This article contains 10 faulty reasoning types, including Negativity Bias, Confirmation Bias, and Pessimism Bias, with Post Hoc (False Cause) as the most egregious example at 69.4% saturation with 86 hits. Analysis detected 604 faulty-reasoning hits from 124 analyzed words, generating a BS Score of 60.9% and a BS Rank of 68% (7,212 of 21,887 articles). This article is worse (more manipulative) than 67.10% of the article peer group.

De Beers is halting production at South Africa’s biggest diamond mine, with gemstone prices falling thanks to slowing demand and increased competition from lab-grown stones. 
The Venetia mine produces 40% of South Africa’s diamonds. 
De Beers managed to prevent prices sliding in the 1960s after the discovery of major reserves in the Soviet Union, via clever marketing and what The Atlantic in 1982 called “the most successful cartel arrangement in the annals of modern commerce,” but the ever-improving quality of artificial diamonds  and Chinese consumers’ collapsing interest in luxury goods  has defeated it. 
The cost of the real gems has fallen 50% since 2022, and De Beers’ parent company Anglo American is looking to sell. 
Article reasoning-pattern comparisonThis article: 49.2%Tom Chivers: 8.3%Semafor: 4.7%Confirmation Bias49.2%This article: 17.7%Tom Chivers: 5.0%Semafor: 1.6%Anchoring Bias17.7%This article: 0.0%Tom Chivers: 10.6%Semafor: 5.5%Availability Heuristic0.0%This article: 0.0%Tom Chivers: 1.8%Semafor: 1.4%Representativeness Heuristic0.0%This article: 0.0%Tom Chivers: 1.8%Semafor: 1.1%Hindsight Bias0.0%This article: 0.0%Tom Chivers: 3.1%Semafor: 2.3%Overconfidence Bias0.0%This article: 0.0%Tom Chivers: 18.4%Semafor: 15.9%Framing Effect0.0%This article: 0.0%Tom Chivers: 0.9%Semafor: 0.8%Loss Aversion0.0%This article: 0.0%Tom Chivers: 1.2%Semafor: 0.8%Status Quo Bias0.0%This article: 0.0%Tom Chivers: 0.7%Semafor: 0.5%Sunk Cost Effect0.0%This article: 0.0%Tom Chivers: 9.1%Semafor: 4.9%Optimism Bias0.0%This article: 49.2%Tom Chivers: 8.1%Semafor: 4.0%Pessimism Bias49.2%This article: 66.9%Tom Chivers: 24.0%Semafor: 12.8%Negativity Bias66.9%This article: 0.0%Tom Chivers: 0.0%Semafor: 1.3%Self-Serving Bias0.0%This article: 0.0%Tom Chivers: 1.8%Semafor: 0.9%Fundamental Attribution Error0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.0%Actor-Observer Bias0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 1.6%In-Group Bias0.0%This article: 0.0%Tom Chivers: 1.0%Semafor: 0.9%Out-Group Homogeneity Bias0.0%This article: 0.0%Tom Chivers: 2.3%Semafor: 2.1%Halo Effect0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.2%Horn Effect0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.0%Dunning-Kruger Effect0.0%This article: 0.0%Tom Chivers: 4.5%Semafor: 3.3%Recency Bias0.0%This article: 0.0%Tom Chivers: 0.7%Semafor: 0.7%Primacy Effect0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.0%Blind-Spot Bias0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.5%Ad Hominem0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.4%Straw Man0.0%This article: 49.2%Tom Chivers: 12.3%Semafor: 7.0%Appeal to Authority49.2%This article: 0.0%Tom Chivers: 3.4%Semafor: 2.5%False Dilemma0.0%This article: 0.0%Tom Chivers: 3.2%Semafor: 2.2%Slippery Slope0.0%This article: 0.0%Tom Chivers: 0.5%Semafor: 0.1%Circular Reasoning0.0%This article: 0.0%Tom Chivers: 18.8%Semafor: 8.3%Hasty Generalization0.0%This article: 49.2%Tom Chivers: 1.2%Semafor: 0.3%Red Herring49.2%This article: 0.0%Tom Chivers: 2.1%Semafor: 1.1%Bandwagon0.0%This article: 0.0%Tom Chivers: 6.2%Semafor: 6.3%Appeal to Emotion0.0%This article: 0.0%Tom Chivers: 2.3%Semafor: 1.2%Begging the Question0.0%This article: 69.4%Tom Chivers: 10.7%Semafor: 4.9%Post Hoc (False Cause)69.4%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.1%Tu Quoque0.0%This article: 0.0%Tom Chivers: 1.0%Semafor: 0.4%Burden of Proof0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.0%Appeal to Nature0.0%This article: 0.0%Tom Chivers: 1.6%Semafor: 0.6%Composition/Division0.0%This article: 0.0%Tom Chivers: 2.8%Semafor: 2.0%Anecdotal0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.1%No True Scotsman0.0%This article: 0.0%Tom Chivers: 2.9%Semafor: 2.6%Ambiguity (Equivocation)0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.0%Gambler’s Fallacy0.0%This article: 0.0%Tom Chivers: 0.4%Semafor: 0.1%Middle Ground0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.0%Personal Incredulity0.0%This article: 0.0%Tom Chivers: 1.7%Semafor: 0.2%Special Pleading0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.0%Genetic Fallacy0.0%This article: 49.2%Tom Chivers: 4.6%Semafor: 5.1%Unattributed Quote49.2%This article: 49.2%Tom Chivers: 5.0%Semafor: 3.9%Quote-first Misdirection49.2%This article: 37.9%Tom Chivers: 15.8%Semafor: 9.4%Biased Writer Voice37.9%This article: 0.0%Tom Chivers: 0.5%Semafor: 1.7%Indoctrination0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 1.1%Politically Left Leaning Bias0.0%This article: 0.0%Tom Chivers: 0.0%Semafor: 0.7%Politically Right Leaning Bias0.0%This article: 0.0%Tom Chivers: 1.3%Semafor: 0.8%Attempt to Sell a Product or S…0.0%

124 words analyzed.

Speakers

No attributed speakers were identified in this analysis.

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Analysis

Hover over highlighted words in the article to view the associated bias or fallacy analysis.