What Is XRF Testing? How We Test Gold and Silver at Greenville Gold & Silver

Short answer: XRF testing (X-ray fluorescence) is a fast, non-destructive way to identify and measure the metals at or near the surface of gold, silver and platinum. At Greenville Gold & Silver, we use it alongside our experience and other evaluation methods to help determine precious metal content, and we’ll walk you through your offer before you decide whether to sell.

What is XRF testing?

An XRF analyzer directs X-rays at a metal item and measures the X-rays the metal gives off in response. Each metal has its own signature, so the analyzer can identify the metals present and estimate their percentages. For example, a reading might show about 58.5 percent gold in a piece of 14-karat jewelry, or 92.5 percent silver in a sterling item. It takes only seconds and needs no scratching, filing or acid.

How accurate is XRF testing?

On solid, well-made jewelry, a properly calibrated XRF analyzer gives a very good reading. But it analyzes the surface, not the whole interior of the piece, and its accuracy depends on calibration and the condition of the surface. That’s why the experience of the person reading the result matters as much as the machine.

Can XRF detect gold plating?

Sometimes, but not always. XRF can reveal an unexpected mix of metals and give clues that a piece is plated or marked incorrectly. A thick layer of gold on the surface, though, can hide what’s underneath. The Gemological Institute of America has documented gold plating that made a piece read as higher purity than it really was. Gold-filled and plated items can fool a surface reading. When a result raises questions, we use additional evaluation methods rather than relying on one reading alone.

XRF versus acid testing

Traditional methods, including acid and touchstone testing, have been used by precious metal dealers for generations. They are still useful, although some require removing a tiny amount of metal or making a test mark. XRF gives us valuable information without scratching or applying acid to your item. No single testing method is perfect. The best approach combines the right equipment with experience and careful examination.

Why we evaluate in front of you

Your items never leave your sight. Not every piece needs XRF testing; many are clearly marked and easy to judge. When additional testing is appropriate, we use our XRF analyzer right at the counter. We believe customers should be able to see how their items are tested and weighed, ask questions, and understand how we arrived at our offer. Our guide to karats and melt value shows how purity, weight and the spot price fit together.

Does XRF testing damage jewelry?

No. It is non-destructive. No scratching, no filing, no acid, so your jewelry and coins leave exactly the way they came in.

Visit Greenville Gold & Silver

Most purchases are paid in cash on the spot. No appointment is needed; bring a valid photo ID, which South Carolina requires. To see what a visit looks like, read what happens at our counter when you sell gold. Greenville Gold & Silver is a family-run shop at 1637 Woodruff Rd in Greenville, serving the Upstate since 2012, with 4.9 stars from 800+ Google reviews. We’re open Monday to Friday 10 to 6 and Saturday 10 to 3. Stop in, or call 864-901-7975.

Want to see how we evaluate your items? Your gold, silver and platinum never leave your sight at Greenville Gold & Silver. When additional testing is appropriate, we use our XRF analyzer right at the counter, and we’ll walk you through your offer before you decide whether to sell. Most purchases are paid in cash on the spot. Call 864-901-7975.

Want to see where the XRF fits in a real visit? Here’s what happens at our counter when you sell gold.