Try it as a customer.

An example shop with six products. Every price comes straight from weight × fineness × market price, with its own markup per product. Put something in the basket and watch the price get locked.

This is an example. Nothing is sold; products and markups are made up, the market prices are real. Price at —

Link bracelet 14 carat

585 · 10 g · markup 25% + €45

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Plain ring 18 carat

750 · 5 g · markup 40% + €30

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Gold bar 1 kilo

999.9 · 1,000 g · markup 1.5%

€116,488

Silver ring 925

925 · 6 g · markup 180% + €15

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Silver bar 1 kilo

999 · 1,000 g · markup 9%

€1,688

Platinum stud earrings 950

950 · 3 g · markup 70% + €25

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What is behind each price

The bracelet uses a 25% markup plus €45 for labour, the kilo bar 1.5%. That is how you set it in the plugin per product or variation: a percentage, a fixed amount or both, with a minimum price as a floor.

Curious how that works inside WordPress? See the plugin screenshots.