What stones will pass a diamond tester?

When it comes to testing the authenticity of a diamond, diamond testers use thermal conductivity to distinguish between diamonds and other gemstones. While most gemstones will not register as diamonds on a diamond tester, there are a few exceptions.

**Moissanite** is one of the only stones that will consistently register as a diamond on a diamond tester. This is because moissanite has a similar thermal conductivity to diamonds, making it a popular diamond alternative for jewelry.

What are some other gemstones that may pass a diamond tester?

**Cubic Zirconia** is another synthetic gemstone that may sometimes register as a diamond on a tester due to its similar thermal conductivity.

**White sapphire** is a natural gemstone that can also sometimes pass as a diamond on a tester due to its thermal conductivity.

**YAG (Yttrium Aluminum Garnet)** is a synthetic gemstone that can sometimes register as a diamond on a tester, although it is less common than moissanite or cubic zirconia.

**Gadolinium gallium garnet (GGG)** is a synthetic gemstone that may pass as a diamond on a tester because of its thermal conductivity.

**Spinel**, a natural gemstone, may sometimes register as a diamond on a tester due to its thermal conductivity.

**Rutile**, a mineral that is sometimes used as a gemstone, can also pass as a diamond on a tester because of its thermal conductivity.

**Zircon**, another natural gemstone, may occasionally register as a diamond on a tester because of its thermal conductivity.

What gemstones will not pass a diamond tester?

**Emerald**, a popular green gemstone, will not pass a diamond tester as its thermal conductivity differs significantly from that of a diamond.

**Ruby**, a red gemstone, will not register as a diamond on a tester due to its different thermal conductivity.

**Sapphire**, a blue gemstone, will not pass a diamond tester as its thermal conductivity is different from that of a diamond.

**Topaz**, a colorful gemstone, will not register as a diamond on a tester because of its distinct thermal conductivity.

**Citrine**, a yellow gemstone, will not pass a diamond tester as its thermal conductivity is different from that of a diamond.

**Amethyst**, a purple gemstone, will not register as a diamond on a tester due to its differing thermal conductivity.

**Aquamarine**, a light-blue gemstone, will not pass a diamond tester as its thermal conductivity is distinct from that of a diamond.

**Peridot**, a green gemstone, will not register as a diamond on a tester because of its thermal conductivity.

**Tourmaline**, a multi-colored gemstone, will not pass a diamond tester as its thermal conductivity differs from that of a diamond.

**Opal**, a colorful and iridescent gemstone, will not register as a diamond on a tester due to its unique thermal conductivity.

**Turquoise**, a blue-green gemstone, will not pass a diamond tester as its thermal conductivity is different from that of a diamond.

**Lapis Lazuli**, a blue gemstone, will not register as a diamond on a tester because of its distinct thermal conductivity.

Overall, while there are a few gemstones that may pass a diamond tester due to their thermal conductivity, these stones are exceptions rather than the rule. When in doubt about the authenticity of a diamond, it is always best to consult with a professional gemologist.

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