{"id":108497,"date":"2023-11-29T14:13:25","date_gmt":"2023-11-29T13:13:25","guid":{"rendered":"https:\/\/laboratornidiamanty.cz\/detecting-a-lab-grown-diamond-with-a-tester\/"},"modified":"2026-09-21T20:58:52","modified_gmt":"2026-09-21T18:58:52","slug":"detecting-a-lab-grown-diamond-with-a-tester","status":"publish","type":"post","link":"https:\/\/laboratornidiamanty.cz\/en\/detecting-a-lab-grown-diamond-with-a-tester\/","title":{"rendered":"Detecting a Lab-Grown Diamond with a Tester"},"content":{"rendered":"<h3>Lab-grown diamonds made using HPHT can be detected as moissanite. Why?&nbsp;<\/h3>\n<p class=\"MsoNormal\"><span style=\"color: rgb(0, 0, 0);\">Lab-grown diamonds can be grown using different<br \/>\ntechniques, including the High Pressure High Temperature (HPHT) method, which can<br \/>\nsometimes cause diamond testers, such as the Presidium Multi Tester<br \/>\nor Presidium Diamond Verification, to detect them as moissanite.<\/span><o:p><\/o:p><\/p>\n<p class=\"MsoNormal\"><o:p><span style=\"color: rgb(0, 0, 0);\">&nbsp;<\/span><\/o:p><span style=\"letter-spacing: 0px; color: rgb(0, 0, 0);\">Moissanite (SiC) is a mineral that has a similar appearance to diamonds<br \/>\nand is often used as a diamond substitute in jewellery. It is also considerably<br \/>\ncheaper than natural or lab-grown diamonds. Diamond testers<br \/>\nwork by measuring the thermal conductivity of the gemstone. Diamonds have<br \/>\nhigh thermal conductivity, meaning they conduct heat very well, while<br \/>\nmoissanite has a much lower thermal conductivity.&nbsp;However, some HPHT lab-grown diamonds can be<br \/>\nregistered as moissanite on diamond testers. This is because the<br \/>\nHPHT process can sometimes leave metallic inclusions in the diamond, which can affect its<br \/>\nthermal conductivity. These inclusions are often iron or nickel, which have a much<br \/>\nlower thermal conductivity than diamond, but one similar to moissanite. As a result,<br \/>\nwhen a diamond tester is used, an HPHT lab-grown<br \/>\ndiamond with metallic inclusions may be registered as moissanite instead of diamond.<\/span><\/p>\n<p class=\"MsoNormal\"><o:p><\/o:p><\/p>\n<p class=\"MsoNormal\"><o:p><span style=\"color: rgb(0, 0, 0);\">&nbsp;<\/span><\/o:p><span style=\"letter-spacing: 0px; color: rgb(0, 0, 0);\">Another factor that can cause an HPHT lab-grown<br \/>\ndiamond to register as moissanite on a diamond tester is the<br \/>\ncrystal structure. While both diamonds and moissanite are made up of carbon atoms,<br \/>\ntheir crystal structure is different. The crystal structure of moissanite grown<br \/>\nusing the HPHT method more closely resembles that of diamond. This can<br \/>\nconfuse diamond testers, because the tester may not be able to tell the two<br \/>\nmaterials apart.&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"letter-spacing: 0px; color: rgb(0, 0, 0);\">From our experience, it is mainly small lab-grown diamonds (HPHT) that are detected as moissanite. For larger sizes above 0.30ct, lab-grown diamonds are reliably detected as diamond on the tester.&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\" style=\"color: rgb(0, 0, 0);\">How to easily tell moissanite apart from both natural and lab-grown diamonds:&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"color: rgb(0, 0, 0);\">&#8211; a natural diamond is like a &#8220;drop of water&#8221; &#8211; clear, pure, transparent. Unlike a diamond, moissanite has a slightly hazy (milky) look. With a bit of exaggeration, it&#8217;s a bit like pouring milk into a glass of water.&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"color: rgb(0, 0, 0);\"><b>Other ways to tell a diamond apart from moissanite:&nbsp;<\/b><\/p>\n<p class=\"MsoNormal\" style=\"color: rgb(0, 0, 0);\">&#8211; a diamond is carbon (C) | moissanite is SiC (silicon carbide)<\/p>\n<p class=\"MsoNormal\" style=\"color: rgb(0, 0, 0);\">&#8211; moissanite is more colourful (up to 200% more fire than diamond)<\/p>\n<p class=\"MsoNormal\" style=\"color: rgb(0, 0, 0);\">&#8211; moissanite has birefringence&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"color: rgb(0, 0, 0);\">&#8211; hardness: carbon 10 vs. moissanite 9.25<\/p>\n<p class=\"MsoNormal\"><\/p>\n<p class=\"MsoNormal\"><o:p><\/o:p><\/p>\n<p style=\"color: #000000;\">We have more than 50,000!! diamonds for you to choose from, so we firmly believe we&#8217;ll find the right diamond for you. We actively monitor our competitors&#8217; prices and can say that we offer both lab-grown and natural diamonds at the best prices on the market.&nbsp;<\/p>\n<p style=\"color: #000000;\">If you&#8217;re still hesitant, send us an enquiry and we&#8217;ll get back to you right away with an offer you can compare with no obligation.&nbsp;<\/p>\n<p style=\"color: #000000;\">We look forward to hearing from you soon!&nbsp;<\/p>\n<p><span style=\"color: #000000;\">If you have any questions about lab-grown &amp; natural diamonds, feel free to write to us at: <\/span><a style=\"color: #000000;\" href=\"mailto:info@laboratornidiamanty.cz\">info@laboratornidiamanty.cz<\/a><span style=\"color: #000000;\">&nbsp;<\/span><\/p>\n<p><span style=\"color: #737e86;\">Team ULTIMATE-GEMS s. r. o.&nbsp;<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lab-grown diamonds made using HPHT can be detected as moissanite. Why?&nbsp; Lab-grown diamonds can be grown using different techniques, including the High Pressure High Temperature (HPHT)<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":2,"featured_media":108515,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-108497","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Detecting a Lab-Grown Diamond with a Tester - Lab-grown diamonds<\/title>\n<meta name=\"description\" content=\"How to verify a diamond&#039;s authenticity with a tester: what a tester shows for lab-grown and natural diamonds, moissanite and cubic zirconia, and why only a certificate gives certainty.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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