Key benefits Fast, accurate, and safe diamond testing without damaging stones. Clear results on an LCD display plus LED indicators and audible beep for instant interpretation. Simple enough for nonprofessionals, reliable enough for professionals, hobbyists, coin collectors, and business owners. Compact, handheld diamond tester pen that is practical for store counters, bench work, and field use. Main features LCD display and LED indicator: Shows testing results and carat settings clearly. Audible feedback: Beep confirms a positive diamond detection; tones indicate metal contact. Thermal conductivity detection: Differentiates natural diamonds from simulants such as cubic zirconia (CZ) without physical damage. Adjustable carat setting: Up/down buttons set the instrument to approximate stone size for more accurate readings. Touch panel operation: Requires barehand contact on the rear touch panel during testing to register correctly. How it works Turn the tester on, set the approximate carat range using the up/down buttons, touch the rear panel with a bare finger, then place the pen tip vertically and gently on the stone. A real diamond will light the indicator to levels above 9 and emit audible signals. No reaction indicates a simulant or fake (for example, CZ). The instrument uses thermal conductivity; metals and some other materials can trigger frequency sounds because they conduct heat similarly to diamonds. Carat/size guidance For diamonds greater than 1.0 carat: select the 1greenlight setting. For diamonds around 0.5 carat: select the 2greenlight setting. For small stones (cuts, cones, etc.): select 3–4 green lights. You do not need to set an exact carat value—choose the closest size range. Do not touch the instrument keys while testing. Important precautions Test only suitable items. Avoid testing metal, skin, water, or other inappropriate surfaces; these can produce false frequency sounds or incorrect readings. Ensure proper contact: hold the rear touch panel with a bare finger and place the tip vertically and gently on the stone. Incorrect contact will cause flashing or shutoff and may yield wrong results. Follow the correct testing procedure to maintain accuracy. Improper operation can affect results. Use scenarios Jewelry store verification: Quickly check loose diamonds or mounted stones at the sales counter before or consignment. Estate and pawn appraisals: Assess incoming items for diamonds versus simulants during intake or appraisal. Home hobbyists and collectors: Test inherited jewelry, small finds, or stones purchased online to confirm authenticity without sending items out. What it detects Designed to identify natural diamonds reliably by measuring thermal conductivity. Identifies common simulants such as cubic zirconia by lack of the diamondspecific response. May react to metals or other conductive materials with a distinct frequency sound—interpret accordingly and avoid testing such items. Practical notes The tester is intended for quick, onthespot checks. For full gemological certification, use a laboratory or professional gemologist. Keep the tip clean and handle gently. Read and follow the operating instructions for performance. Suitable for professionals and nonprofessionals who need a reliable, portable diamond testing tool that is simple to use, accurate, and safe for the stones.