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Learning Guide

64 guides on precious metals and numismatics — how they're priced, how they're made, what makes a coin worth more than its metal, and how to buy without overpaying.

investing· beginner· 14 min read

Understanding the Troy Ounce: Your Guide to Precious Metals Weight

What is a troy ounce? Learn the crucial difference between a troy ounce and a standard ounce, and why this universal unit of measurement is the foundation of trust in the global gold, silver, and platinum markets.

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bullion· intermediate· 14 min read

What Is Bullion? An Introduction to Precious Metals

Learn about bullion coins, rounds, and bars made from precious metals like gold, silver, and platinum, and understand why their value is tied directly to their weight and purity.

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history· intermediate· 15 min read

The History of Gold Prices: From Fixed Value to Free Market

Trace the history of gold prices from the fixed rate of the Gold Standard to the free-floating market of today, and understand why events like the Nixon Shock made gold a premier safe-haven asset.

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science· beginner· 9 min read

How to Test Gold at Home: Magnet, Density, Acid and the Tests That Do Not Work

How to test gold at home step by step: hallmark, magnet, density, ceramic streak and acid kit, what each proves, and why toothpaste and vinegar tests fail.

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bullion· beginner· 8 min read

Costco Gold Bars: Price Today, Purchase Limits and Resale Value

Costco 1 oz gold bars from PAMP and Rand Refinery: price versus spot today, the per-membership limit, Executive rewards, and what the bars are worth when you sell.

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bullion· beginner· 8 min read

Costco Silver Bars and Coins: Kirkland 1 oz Bars, Prices and Resale Value

What Costco silver costs versus spot: Kirkland Signature 1 oz bars, 10 oz bars and coin tubes, membership limits, and what the bars are worth when you sell.

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Explore by track

Coin value guides

All 31 series

Grade-by-grade price estimates for 174 classic US key dates, each sourced from a named numismatic reference — up to $1,714,917 for the finest known example.

All guides

Topic
Level
bullion· intermediate· 12 min read

Bullion vs. Collectible Coins: An Investor's Guide to Value

Explore the critical differences between bullion coins and collectible (numismatic) coins, understanding how one is valued for its raw metal content while the other is prized for rarity and condition.

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bullion· intermediate· 10 min read

What Defines Gold Bullion?

What is gold bullion? Explore this guide to understand gold bullion's forms, including coins and bars, and learn why its value is determined by its purity, weight, and the live market spot price.

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bullion· intermediate· 11 min read

What Exactly Is Silver Bullion?

Discover what silver bullion is, the different forms it takes, like coins, bars, and rounds, and why its value is tied directly to its silver content and the live spot price.

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bullion· intermediate· 12 min read

Investing vs. Collecting: Bullion and Numismatics Explained

Understand the key differences between buying and selling bullion versus numismatic coins, from what drives their value to the strategies used for acquiring and liquidating each asset type.

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science· intermediate· 12 min read

Unearthing Silver: A Look at Global Mining Methods

Discover how silver is mined, from traditional underground lode mining to modern open-pit operations, and learn why most silver is extracted as a byproduct of mining other metals.

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science· intermediate· 10 min read

The Changing Composition of the U.S. Cent

Discover what pennies are made of and how the composition of the U.S. one-cent coin has evolved over time, from its original pure copper to today's copper-plated zinc.

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science· beginner· 10 min read

The Global Hunt for Platinum: Where is it Mined?

Discover where platinum is mined around the world, from the dominant Bushveld Complex in South Africa to significant operations in Russia and North America, and understand why its supply is so concentrated.

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science· intermediate· 10 min read

The Scientific Basis of Value: Why Some Metals Are Precious

Explore the science behind precious metals; learn why the unique chemical properties and cosmic rarity of gold, silver, and platinum make them intrinsically valuable.

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science· beginner· 12 min read

A Practical Guide to Verifying Platinum at Home

Learn how to test for real platinum at home using simple, non-destructive methods like the magnet test and checking for official hallmarks, helping you distinguish it from look-alike metals.

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science· intermediate· 10 min read

Understanding Platinum's Durability: Tarnish vs. Patina

Discover why platinum, one of the noblest metals, does not tarnish and learn the difference between corrosion and the natural patina that develops on platinum over time.

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history· beginner· 10 min read

Coins as Historical Artifacts: More Than Just Money

Explore how coins have served as more than just money throughout history, acting as tools for propaganda, historical records, and expressions of art and culture.

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mints· beginner· 10 min read

Government Mints vs. Private Mints: What’s the Difference?

Understand the crucial difference between sovereign mints and private mints, and learn how their respective roles, products, and legal tender status impact the precious metals market.

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Free calculators & tools

Put the guides into practice -- melt values, ratios, and allocations against live spot prices.

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