Petra DiamondsCHIX:PDLL Graham Number is £N/A as of Dec. 2025. The stock has 2 warning signs investors should review. Among 609 Metals & Mining companies, Petra Diamonds ranks worse than 164203.45% on this metric.
Graham Number is a figure that measures a stock's fundamental value by taking into account the company's earnings per share and book value per share. The Graham number is the upper bound of the price range that a defensive investor should pay for the stock. According to the theory, any stock price below the Graham number is considered undervalued, and thus worth investing in.
As of today (2026-07-05), the stock price of Petra Diamonds is £0.0798. Petra Diamonds's graham number for the quarter that ended in Dec. 2025 was £N/A. Therefore, Petra Diamonds's Price to Graham Number ratio for today is N/A.
The historical rank and industry rank for Petra Diamonds's Graham Number or its related term are showing as below:
During the past 13 years, the highest Price to Graham Number ratio of Petra Diamonds was 3.71. The lowest was 0.22. And the median was 1.08.
CHIX:PDLl's Price-to-Graham-Number is not ranked *
in the Metals & Mining industry.
Industry Median: 1.32 * Ranked among companies with meaningful Price-to-Graham-Number only.
Graham Number is a combination of asset valuation and earnings power valuation. It is a very conservative way of valuing a stock.
Petra Diamonds (CHIX:PDLl) Graham Number Explanation
Ben Graham actually did not publish a formula like this. But he wrote in The Intelligent Investor (1948 version) regarding to the criteria for purchases:
Current price should not be more than 15 times average earnings of the past three years.
Current price should not be more than 1.5 times the book value last reported. However, a multiplier of earnings below 15 could justify a correspondingly higher multiplier of assets. As a rule of thumb we suggest that the product of the multiplier times the ratio of price to book value should not exceed 22.5. (This figure corresponds to 15 times earnings and 1.5 times book value. It would admit an issue selling at only 9 times earnings and 2.5 times asset value, etc.)
Unlike valuation methods such as DCF or Discounted Earnings, the Graham number does not take growth into the valuation. Unlike the valuation methods based on book value alone, it takes into account the earnings power. Therefore, the Graham Number is a combination of asset valuation and earnings power valuation.
In general, the Graham number is a very conservative way of valuing a stock. It cannot be applied to companies with negative book values.
Petra Diamonds's Price to Graham number Ratio for today is calculated as
Price to Graham number
=
Share Price (Today)
/
Graham number (Q: Dec. 2025 )
=
0.0798
/
N/A
=
N/A
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
Be Aware
Please keep these in mind:
1. Graham Number does not take growth into account. Therefore it underestimates the values of the companies that have good earnings growth. We feel that if the earnings per share grows more than 10% a year, Graham Number underestimates the value.
2. Graham Number punishes the companies that have temporarily low earnings. Therefore, an average of earnings makes more sense in the calculation of Graham Number.
3. Graham Numbers underestimates companies that are light with book.
Petra Diamonds Graham Number Related Terms
Petra Diamonds Graham Number Historical Data
* Premium members only.
The historical data trend for Petra Diamonds's Graham Number can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
For the Other Precious Metals & Mining subindustry, Petra Diamonds's Price-to-Graham-Number, along with its competitors' market caps and Price-to-Graham-Number data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
Petra Diamonds Price-to-Graham-Number vs Metals & Mining Industry
For the Metals & Mining industry and Basic Materials sector, Petra Diamonds's Price-to-Graham-Number distribution charts can be found below:
* The bar in red indicates where Petra Diamonds's Price-to-Graham-Number falls into.
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
Petra Diamonds (CHIX:PDLL) has a Graham Number of £N/A as of Dec. 2025. The Graham Number values a company based on its per-share earnings and book value. View historical data on Petra Diamonds and its competitors. Over the past decade, Petra Diamonds' Graham Number has ranged from 0.22 to 3.71. According to the industry distribution chart, Petra Diamonds ranks #999999 out of 609 companies in the Metals & Mining industry.
Is Petra Diamonds' Graham Number too high?
Petra Diamonds' current Graham Number is £N/A. Over the past 10 years, this metric has ranged from a low of 0.22 to a high of 3.71. Based on the distribution chart, Petra Diamonds ranks #999999 out of 609 companies in the Metals & Mining industry, which is in the bottom quartile relative to peers.
How does Petra Diamonds' Graham Number compare to HL?
According to the Metals & Mining industry distribution chart, Petra Diamonds ranks #999999 out of 609 companies for Graham Number. This places Petra Diamonds in the lower half of its industry. The industry median Graham Number is 1.32. Historically, Petra Diamonds' own Graham Number has ranged from 0.22 to 3.71 over the past decade. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Graham Number for a Metals & Mining company?
The median Graham Number among Metals & Mining companies is 1.32, based on 609 companies in the industry. Companies in the top quartile (top 25%) have a Graham Number significantly above this median, while those in the bottom quartile fall well below. However, Graham Number should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Graham Number mean?
A high Graham Number can signal that a stock is expensive relative to its fundamentals. The Graham Number values a company based on its per-share earnings and book value. View historical data on Petra Diamonds and its competitors. For the Metals & Mining industry, the median Graham Number is 1.32 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Petra Diamonds's current Graham Number is £N/A. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Petra Diamonds stock overvalued right now?
Based on GuruFocus' analysis, Petra Diamonds (CHIX:PDLL) is currently considered Possible Value Trap. The stock's GF Value™ is £0.28, compared to a current price of £0.08 — trading 71.5% below its estimated fair value. The current Graham Number is £N/A. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Graham Number calculated?
Graham Number is calculated from a company's financial statements. For Petra Diamonds (CHIX:PDLL), the current Graham Number is £N/A as of Dec. 2025. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Petra Diamonds Ltd is an independent diamond mining company. It focuses on the upstream segment of the diamond pipeline, which includes mining, processing, sorting, and selling rough diamonds. It operates in Southern Africa, with mines such as Cullinan and Finsch producing high-quality white and rare blue diamonds. Its operating and geographical segments are: a) Mining: The extraction and sale of rough diamonds from mining operations in South Africa and Tanzania, b) Corporate: Administrative activities in the United Kingdom, c) Beneficiation: Beneficiation activities in South Africa. The majority of revenue is generated from the sale of rough diamonds.
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