In short
Found a number that looks wrong, a stamp the decoder does not know, or a chain weight that is off from what you weighed? Tell me. Corrections with a source or a photo get fixed the same week and credited on the page.
How to reach me
Message me on LinkedIn: Alexey Kravchenko. It is the fastest way to reach me and it shows who you are writing to. I answer questions about how a calculator works and fix mistakes on the pages; I do not appraise pieces or recommend a specific buyer.
What I can and cannot do
I can explain a formula, add a stamp to the decoder, correct a fact, and add a question you asked to the page where it belongs. I cannot value your jewelry from a description or a photo, tell you whether a specific offer is fair, or recommend where to sell; the pages on scrap value and testing gold are the closest this site comes.