Here's a conversation that happens in jewelry businesses more often than anyone would like to admit. Someone says a piece has a 'fifty percent markup,' someone else hears 'fifty percent margin,' and everyone nods — except those are two different numbers, and the gap between them is real money walking out the door. Margin and markup get used interchangeably all the time, and the confusion isn't harmless. It quietly erodes profitability one mispriced piece at a time.
This is one of those topics that feels too basic to revisit, which is exactly why the confusion persists. So let's clear it up properly, because getting it right is one of the simplest ways to stop leaking margin.
The two numbers, plainly
Both margin and markup describe the difference between what a piece costs you and what you sell it for. The difference is what they measure that difference against.
Markup is the difference as a percentage of your cost. You take how much you added, divided by what the piece cost you. Margin is the difference as a percentage of your selling price. You take how much you made, divided by what you sold it for. Same dollar difference; two different denominators; two very different percentages.
Why the gap matters — a concrete example
Say a piece costs you 100 dollars and you sell it for 150. You added 50 dollars. As markup, that's 50 divided by 100 — a 50 percent markup. As margin, that's 50 divided by 150 — a 33 percent margin. Same piece, same prices, but '50 percent' and '33 percent' are very different realities. If you believed you were making a 50 percent margin when you were actually making 33, you've badly overestimated your profitability on that sale.
How this quietly costs you
The confusion does real damage in a few ways. When you set prices believing your markup percentage is your margin, you systematically under-price — leaving profit on the table on every affected piece. When you compare your performance to a margin benchmark using markup math, you misjudge how you're really doing. And when different people in your business use the terms differently, your pricing decisions rest on numbers that don't mean what everyone thinks they mean.
The classic jewelry example is keystone pricing — doubling cost to set price. Doubling cost is a 100 percent markup, but it's a 50 percent margin. A jeweler who thinks keystone gives them '100 percent' profitability is conflating the two; the actual margin is half that. Multiply that misunderstanding across a whole inventory and a year of pricing, and it adds up to serious money.
Getting it right
The fix is simple awareness: know which number you're talking about, and standardize on margin for thinking about profitability — because margin tells you what share of each sale you actually keep, which is what you really want to know. Use markup if you like as a pricing mechanic, but always understand its margin equivalent. And make sure everyone in your business means the same thing when they use the words.
This is unglamorous, but it's one of the highest-return five minutes of clarity a jeweler can have. Pricing is where your profitability is won or lost, and you can't price well on a number you've misunderstood. Get margin and markup straight, and every pricing decision after it rests on solid ground.
Pricing every piece on a clear, accurate understanding of true margin — against what the market actually pays — is exactly what the AMZgemz AI Pricing Agent does. It works from your real costs and real market prices to show where your margins actually stand and where you're leaving money on the table, so your pricing rests on the right numbers. You set the strategy; the agent keeps the math honest.
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