New to coins or precious metals? Start here for clear explanations of common terms, coin types, weights, pricing, and grading. The live ticker shows market-price references, not the final price of a specific item. Copper is a base-metal price reference and is not a retail quote for a copper round or collectible.
What does “bullion” mean?
Bullion is precious metal—usually gold, silver, platinum, or palladium—valued mainly for the amount of fine metal it contains. It can come as bars, privately minted rounds, or government-minted bullion coins. A bullion coin may also have collectible value, but its metal content is the starting point for understanding its value.
Copper is different: it is a base metal rather than a precious metal. Copper rounds and bars are commonly bought for their copper content, designs, themes, or collectible appeal.
Bars, rounds, coins, and fractional pieces
A round looks like a coin but is generally made by a private mint and does not have legal-tender face value. A bar is a piece of refined metal, commonly rectangular, though shapes vary. A government bullion coin is issued by a government mint and typically carries a denomination, even when its trading value is much higher than that face value.
Fractional bullion means a piece containing less than one troy ounce of precious metal—for example, 1/2 oz, 1/4 oz, or 1/10 oz. A fraction can be a coin, round, or bar. Fractional pieces let buyers purchase a smaller amount at a time and can be easier to sell in smaller increments. Their price per ounce is often higher than the same product in a one-ounce size because minting and handling costs are spread over less metal. Check the exact fine-metal weight: a coin’s total weight may be greater than its gold content.
Common types of coins
- Bullion coins: valued mostly for precious-metal content, plus any market premium.
- Numismatic or collectible coins: valued for factors such as rarity, date, mint mark, condition, demand, and history, in addition to metal content.
- Proof coins: specially struck for collectors, often with reflective fields and detailed finishes. “Proof” describes how a coin was made, not a grade.
- Commemorative coins: issued to recognize a person, place, or event. Their metal and collector value depend on the specific issue.
For a U.S. coin, the date tells when it was issued; the mint mark identifies the mint that made it. A small symbol called a privy mark is different: it is a special design symbol that can point to an event, anniversary, theme, or other production detail. A privy mark may add collector interest, but it does not automatically make a coin rare or valuable.
Spot price, melt value, and premium
Spot price is a market reference for a metal, commonly quoted per troy ounce. It changes during the trading day. Melt value is an estimate based on the fine-metal content multiplied by the spot price.
The price to buy a physical item can be above its melt value. The difference is called a premium and can reflect minting, refining, distribution, demand, scarcity, and dealer costs. Collectible value can also affect price. When selling, a dealer’s offer may be below its selling price; compare the full buy and sell prices, fees, and shipping.
Remember: the ticker is a spot-price reference, not a quote or guarantee for a particular coin, bar, or round.
Weight and purity
Precious metals are commonly measured in troy ounces. One troy ounce is about 31.1 grams; it is heavier than the everyday ounce used for groceries. A label such as .999 fine means 99.9% of the stated metal is pure. 22-karat gold is 22 parts gold out of 24, or about 91.7% gold.
Check whether a product’s stated weight means its total weight or its fine-metal content. Some alloyed coins weigh more than the amount of pure gold they contain. Read the mint or product specifications for the exact piece.
What does coin grading mean—and what is a “good” grade?
Grading describes a coin’s condition. Professional grading services commonly use a 1–70 scale: higher numbers generally indicate a better-preserved coin. For many circulation-strike coins, MS means Mint State (uncirculated); PF or PR usually identifies a proof coin. The prefix and scale can vary by coin type and service.
On circulated U.S. coins, words such as Good (G), Fine (F), and About Uncirculated (AU) are grade categories. In this system, Good is actually a low circulated grade: the coin is heavily worn, though its main design and lettering are usually visible. Fine has more design detail remaining; AU shows only slight wear; MS means no circulation wear. For uncirculated coins, MS-60 is the entry point and MS-70 is the top of the scale. “Good” in everyday conversation is not the same as the formal grade Good.
There is no single “good grade” for every coin. A high grade may matter to a collector, but rarity, authenticity, eye appeal, market demand, and price matter too. A common coin graded MS-70 can still be common, and a lower-grade rare date can still be desirable. Compare recent sales for the exact coin, date, mint mark, and grade before paying a grading premium.
A professionally graded coin is usually sealed in a labeled holder, often called a slab. The label identifies the service, coin, and assigned grade. Check the service’s certification lookup for the holder number. A grade is an opinion of condition; it does not guarantee a particular market price. Cleaning, damage, rarity, eye appeal, and buyer demand can all affect value.
Which mint made the coin?
A mint is a facility that manufactures coins. On many U.S. coins, a small letter tells you which mint produced that issue. Common U.S. mint marks include P for Philadelphia, D for Denver, S for San Francisco, and W for West Point. Some older U.S. coins carry marks such as CC for Carson City. The location and use of a mint mark depend on the coin and year; some coins have no mark.
Coins from other countries have their own mints and marks—for example, the Royal Canadian Mint, the Royal Mint in the United Kingdom, and the Perth Mint in Australia. Read the coin’s inscriptions and official product details; a mint mark identifies production origin, but by itself does not prove quality or rarity. A privy mark is a separate design symbol and should not be confused with the mint mark.
What is a key date, and why does it matter?
A key date is a date-and-mint-mark combination that is especially hard for collectors to find in a particular coin series. It may have had a low mintage, few examples may have survived, or demand to complete the series may be high. A key date can be scarce even in worn condition. “Key date” is specific to a series: there is no one list of key years that applies to every coin.
Classic U.S. examples include the 1909-S VDB Lincoln cent (San Francisco; 484,000 made), the 1916-D Mercury dime (Denver; 264,000 made), and the 1893-S Morgan dollar (San Francisco; 100,000 made). They are notable within their own series because of limited production and collector demand. These examples are not a complete list, and a low mintage alone does not set a coin’s price: surviving population, grade, authenticity, and current demand also matter.
Before buying a coin advertised as a key date, verify the exact date, mint mark, variety, and authenticity. Compare reputable references and recent sales for that exact issue and grade; descriptions like “rare” or “key date” are not substitutes for verification.
Before you buy
- Confirm the exact item, metal, weight, purity, date, mint mark or privy mark, and condition.
- For graded coins, confirm the grading service and certification number.
- Compare the total price, including premium, tax if applicable, shipping, and any other fees.
- Ask about availability, payment method, shipping, insurance, and return terms before ordering.
- Handle collectible coins carefully by the edges; avoid cleaning or polishing them.
For a direct purchase from TBC, email the item number and confirm current availability and terms. For eBay or GreatCollections listings, use that platform’s listing and checkout process.