Royal Mint Sovereign-family specifications

Gold Sovereign Sizes and Weights

Compare the five published Sovereign-family sizes by gross weight, diameter, fineness and fine-gold mass. Fine-gold grams are derived from the displayed nominal gross weight multiplied by the published 916.7‰ fineness.

Source-based reference

Source-basedNo live quote needed for this reference

Definitions and limitations are listed with the linked primary sources below.

Documented sizes

Quarter through Five Sovereign

Published alloy

916.7‰ gold

Derived field

Gross grams × 0.9167

Specification and intent

Size reference, not a second full-Sovereign melt calculator

The Royal Mint Museum lists five sizes with nominal gross weights, diameters and 916.7 gold alloy. This page owns the size/specification comparison; the separate Sovereign melt calculator remains focused on the full Sovereign's stated fine troy-ounce content.

Royal Mint Museum published gross specifications; fine-gold grams are derived
Size	Denomination	Gross weight	Diameter	Fineness	Derived fine gold
Five-Sovereign piece	£5	39.90 g	36.00 mm	916.7‰	36.5763 g
Double Sovereign	£2	15.98 g	28.40 mm	916.7‰	14.6489 g
Sovereign	£1	7.98 g	22.05 mm	916.7‰	7.3153 g
Half Sovereign	10 shillings	3.99 g	19.30 mm	916.7‰	3.6576 g
Quarter Sovereign	£0.25	2.00 g	13.50 mm	916.7‰	1.8334 g

Reference: Royal Mint Museum size table. Derived fine-gold values use the rounded published gross weights.

Interactive tool

Inspect one Sovereign-family size

Select a row to see its source specifications and the derived fine-gold mass. The calculation uses the rounded nominal weight displayed in the source table.

Sovereign-family size

Selected sizeSovereign£1 denomination

Published dimensions7.98 g · 22.05 mmGross weight · diameter

Published fineness916.7‰Royal Mint Museum reference

Derived fine-gold mass7.3153 g7.98 × 0.9167

Fine-gold grams are derived from nominal gross grams × the published 916.7‰ fineness; the output is a reference calculation, not a separate mint assay.

Source: Royal Mint Museum size table.

Calculation method

How the result is calculated

Derived fine-gold mass in grams = published nominal gross weight in grams × 0.9167. Values are rounded to four decimal places for display; this is not an assay of an individual coin.

Nominal/reference specifications do not account for wear, production tolerance, issue-year variation or measurement error. Fine-gold mass is derived from rounded gross weight and fineness, not a separate exact Royal Mint figure.

Evidence and references

Specification sources

Primary references where available

Information only, not investment advice. Theoretical metal value is not a dealer offer, retail price, jewelry appraisal, assay, or guaranteed sale price.