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Why shops weigh and test jewelry in front of you
The scale and the acid are not theater. They are how both sides stay honest. If they take it in the back, leave.
If I take your chain in the back, you should walk.
Not because every back room is a crime. Because you cannot see the test, you cannot see the scale, and later we will argue about a number you never watched get built.
A decent shop does the ugly work on the pad in front of you.
What we are actually measuring
Jewelry is not “a gold necklace.” It is weight × karat × today’s gold, minus clasps that are not gold, minus stones we do not want, minus the fact that 14k is not 24k.
- Karat vs fineness is the math
- Gold filled vs plated vs solid is how people get surprised
- Troy ounces and pennyweight is the unit on the ticket
If someone quotes you “$40 a gram” and will not say the karat, they are selling you a vibe.
Why the acid looks rude
Acid testing is not pretty. We file a tiny spot or use a stone, drop a chemical, and watch the color. It looks like we are damaging your grandmother’s necklace. We are damaging a speck so we do not lie about the rest.
Electronic testers and XRF are nicer. They are also machines. Machines get fooled. What the tests mean. A shop that only uses one trick on a big lot is guessing.
Why we pop stones out of the price
A diamond in a 14k setting is two conversations. The gold is melt. The stone is a stone. Coin shops are often weak on diamonds on purpose. Diamonds at a coin shop. We will usually bid the gold and hand you the stones, or bid the gold and shrug at the rocks.
That shrug is honesty. A big diamond smile from someone who does not sell diamonds is not.
What you should see on the ticket
Karat. Weight. Price per unit. Total. If any of those are missing, ask. If they will not write it down, the number will change when the paper appears.
Same rule as coins: the metal is yours until you take the money. Walking away.
Part of the coin shop counter wiki · visitors & collectors · NumisQ Learn