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Amazon with ShopHDE has the HDE High Accuracy Diamond Tester for $7.51 + $2.99 shipping = $10.50 shipped. Accurately differentiates diamonds from other materials with audible sounds and includes leather bag and small testing tray.

ShopHDE has the Compact Diamond Tester for $23 - $11 off with coupon code benmay12f34fse [Exp 5/30, 100 uses] = $12 with free shipping. Features Accurately differentiates diamonds from other materials with audible sounds and includes leather bag and small testing tray. All orders ship free from U.S. warehouse.