Gold Test Needles Set of Five-10K-12K-14K-18K-& 22K

Gold Test Needles – Set of Five (10K, 12K, 14K, 18K & 22K)

This professional set of gold test needles includes five needles, each tipped with a different karat of gold, allowing jewelers and metalsmiths to perform comparative acid testing across the most common gold purities. By rubbing each needle against a test stone alongside an unknown gold item, then applying testing acid to both marks, you can observe and compare the acid reactions to estimate the karat of the piece being tested.

If the unknown item's mark dissolves at the same rate as the test needle mark, the karat of the item may match that needle. If the item dissolves faster, the gold content may be lower than the needle used; if it dissolves slower, the item may be a higher karat. This method requires careful observation and practice to master, as results are comparative and subjective in nature.

Features

• Set of five test needles covering five distinct gold karats
• Enables side-by-side acid reaction comparison on a test stone
• Supports identification of common gold purities used in jewelry
• Essential tool for jewelers, pawnbrokers, and precious metal buyers
• Results are comparative — careful observation and practice required

Specifications

What's Included

• 10K gold test needle
• 12K gold test needle
• 14K gold test needle
• 18K gold test needle
• 22K gold test needle

Notes

Gold acid testing using test needles is a comparative method and is entirely subjective. Accurate results require a quality test stone, appropriate testing acids (sold separately), and practiced observation. Results should be interpreted carefully and are not a substitute for certified assay testing.