Understanding Diamond Testers
Diamond testers are portable devices designed to distinguish genuine diamonds from simulants like cubic zirconia or moissanite. These testers work by measuring specific physical properties of gemstones, most commonly thermal or electrical conductivity. The question of whether lab grown diamonds pass diamond testers is increasingly relevant as lab diamonds gain popularity in the jewelry market.
At Bopie’s Custom Jewelry in Fayetteville, we often explain to customers that conventional diamond testers were developed primarily to distinguish natural diamonds from simulants, not to differentiate between natural and lab grown diamonds. This is crucial to understand because lab grown diamonds have the same physical, chemical, and optical properties as natural diamonds – they are real diamonds, just created in a laboratory rather than mined from the earth.
Standard diamond testers measure how quickly heat moves through a gemstone (thermal conductivity). Both natural and lab grown diamonds conduct heat in essentially identical ways because they share the same carbon crystal structure. This means that a basic thermal conductivity diamond tester cannot tell the difference between a natural diamond and a lab grown diamond.
The confusion often arises because consumers may not realize that lab grown diamonds ARE diamonds – they’re not imitations or simulants. They have the identical chemical composition (pure carbon in a crystalline structure) as natural diamonds, which means they will respond to testing equipment in the same way as their mined counterparts.
Modern jewelers use diamond testers as just one tool in their authentication process. At Bopie’s, we employ multiple verification methods to ensure our customers receive exactly what they’re paying for, whether they choose natural or lab grown diamonds for their jewelry pieces.
Lab Grown vs. Natural Diamonds
Lab grown diamonds and natural diamonds share identical physical and chemical properties because both are pure crystallized carbon with the same atomic structure. The only fundamental difference is their origin – one forms deep within the earth over billions of years, while the other is created in a laboratory in a matter of weeks.
This identical composition means lab grown diamonds will pass standard diamond testers with flying colors. Both types of diamonds have the same hardness (10 on the Mohs scale), the same brilliance, fire, and scintillation, and the same thermal and electrical conductivity properties that diamond testers measure.
At Bopie’s, we’ve seen growing interest in lab grown diamonds as environmentally conscious consumers seek alternatives to mined diamonds. These lab created gems offer identical beauty and quality at a more accessible price point, typically costing 30-40% less than comparable natural diamonds.
The manufacturing process for lab diamonds uses one of two methods: High Pressure High Temperature (HPHT) or Chemical Vapor Deposition (CVD). Both processes replicate the natural conditions under which diamonds form, resulting in gems that are optically, chemically, and physically identical to mined diamonds.
Even expert gemologists cannot tell the difference between lab and natural diamonds through visual inspection alone. Advanced spectroscopic equipment is required to detect subtle differences in growth patterns and trace elements. This sophisticated technology is far beyond the capabilities of standard diamond testers available to consumers or even most retail jewelers.
When customers visit our store seeking guidance on diamond purchases, we explain that choosing between lab grown and natural diamonds is a personal decision based on budget, environmental concerns, and personal values – not quality or authenticity. Both options represent real diamonds that will pass standard diamond testers and provide lasting beauty in fine jewelry.
Thermal Conductivity Testing
Thermal conductivity testers are the most common type of diamond testing devices available on the market. These tools measure how quickly heat passes through a gemstone. Diamonds are exceptional thermal conductors – they disperse heat approximately five times faster than most diamond simulants like cubic zirconia or glass.
When a thermal diamond tester touches a gemstone, it applies a small amount of heat and measures how quickly that heat dissipates. If the heat disperses rapidly, the tester registers the stone as a diamond. Since lab grown diamonds have identical thermal properties to natural diamonds (both conduct heat exceptionally well due to their carbon crystal lattice structure), thermal conductivity testers cannot distinguish between them.
At Bopie’s Jewelry, we demonstrate to customers how both natural and lab grown diamonds register the same positive reading on thermal testers. This helps illustrate that lab diamonds aren’t imitations but genuine diamonds with the same physical properties.
It’s worth noting that thermal conductivity testers have limitations even for their primary purpose of separating diamonds from simulants. Moissanite, a popular diamond alternative, also has high thermal conductivity that can sometimes trigger a false positive on basic diamond testers. This is why more sophisticated jewelers now use multi-testers that check both thermal and electrical properties.
The reliability of thermal conductivity testing for diamonds depends somewhat on the quality of the tester and the testing conditions. Factors like ambient temperature, battery condition, and proper contact between the tester tip and the gemstone can all affect results. Professional jewelers maintain their equipment and control testing environments to ensure accurate readings.
For consumers interested in verifying their diamonds at home, thermal conductivity testers are available, but results should be considered preliminary. If there’s any doubt about a diamond’s authenticity, professional verification using multiple testing methods is always recommended.
Electrical Conductivity Testing
Electrical conductivity testing represents another method used to identify diamonds, particularly to distinguish them from moissanite, which can confuse thermal-only testers. Diamonds are electrical insulators, meaning they do not conduct electricity well, while moissanite conducts electricity to some degree.
When it comes to lab grown diamonds, they share the same electrical insulation properties as natural diamonds. Both will register identically on electrical conductivity testers because both have the same carbon crystal structure that resists electrical flow. This means lab diamonds will pass electrical conductivity tests just as natural diamonds do.
Modern diamond testers often combine both thermal and electrical conductivity tests in a single device. These “multi-testers” provide more comprehensive authentication by checking multiple physical properties simultaneously. At Bopie’s, we utilize advanced testing equipment to ensure accurate identification of all gemstones in our inventory.
The electrical conductivity test works by sending a tiny electrical current through the gemstone and measuring the resistance. True diamonds, whether natural or lab grown, will show high resistance to electrical flow. This property is inherent to the diamond’s carbon crystal structure and doesn’t change based on how the diamond was formed.
It’s important to note that some HPHT (High Pressure High Temperature) lab grown diamonds may contain trace amounts of metal inclusions from the growth process. In rare cases, these metal inclusions might slightly affect electrical conductivity readings, but typically not enough to change the overall test result or identification.
For consumers concerned about authenticating their diamonds, understanding that both thermal and electrical conductivity tests are designed to separate diamonds from non-diamond materials – not to distinguish between natural and lab grown diamonds – is crucial. These tests confirm that a stone is a genuine diamond but cannot determine its origin.
Multi-Tester Results with Lab Diamonds
Multi-testers represent the most sophisticated portable diamond testing devices available to jewelers and consumers. These instruments combine thermal conductivity, electrical conductivity, and sometimes even ultraviolet fluorescence testing in a single unit. The question remains: how do lab grown diamonds perform when subjected to these comprehensive tests?
The consistent answer is that lab grown diamonds pass multi-testers just as natural diamonds do. Since multi-testers are designed to distinguish diamonds from simulants based on physical properties, and lab grown diamonds possess identical physical properties to natural diamonds, the testers cannot differentiate between the two origins.
At Bopie’s Jewelry in Fayetteville, we’ve conducted numerous demonstrations showing how both natural and lab grown diamonds register identical results on our professional-grade multi-testers. Both will trigger the “diamond” indication, confirming their authentic diamond composition regardless of origin.
Modern multi-testers are particularly valuable because they eliminate the false positive readings that sometimes occur with moissanite on thermal-only testers. By checking both thermal and electrical properties, they provide a more definitive identification of diamond versus non-diamond materials.
Some premium multi-testers also include UV testing capabilities, measuring how stones react to ultraviolet light. While this can provide additional information about a diamond’s characteristics, it still cannot reliably distinguish lab grown from natural diamonds, as both types can display various fluorescence reactions depending on their specific trace elements.
For jewelers and consumers, multi-testers remain an excellent tool for confirming that a stone is indeed a diamond rather than a simulant. However, for distinguishing between natural and lab grown diamonds, more specialized equipment is required – equipment typically only found in gemological laboratories rather than retail jewelry stores.
Limitations of Diamond Testers
While diamond testers are valuable tools for identifying diamonds versus simulants, they have specific limitations that consumers and jewelers should understand. The most significant limitation in the context of lab grown diamonds is that standard diamond testers – whether thermal, electrical, or multi-testers – simply cannot distinguish between natural and laboratory-created diamonds.
This limitation exists by design, as these testers measure physical properties like thermal and electrical conductivity that are identical in both natural and lab grown diamonds. The testers were never intended to determine a diamond’s origin, only to verify that a stone is, in fact, a diamond rather than a simulant like cubic zirconia or moissanite.
At Bopie’s, we’re transparent with our customers about what these tests can and cannot tell us. Diamond testers cannot detect treatments or enhancements to diamonds, such as color treatments or clarity enhancements. They also cannot determine a diamond’s quality characteristics like cut, color, clarity, or carat weight.
Environmental factors can affect tester accuracy as well. Extremely cold or hot stones may give inaccurate readings. Dirt, oil, or moisture on a diamond can interfere with the test. Even the battery condition of the tester itself can impact results. Professional jewelers account for these variables, but consumers using home testers might get misleading readings if they don’t control for these factors.
Another limitation is that some coated diamonds or composite stones (where a thin layer of diamond material covers a non-diamond core) might pass basic diamond tests despite not being solid diamonds. These sophisticated fakes are rare but highlight why professional verification is important for valuable stones.
For definitive identification of a diamond’s origin (natural vs. lab grown), specialized laboratory equipment like spectroscopy and photoluminescence analyzers is required. These sophisticated instruments can detect subtle growth patterns and trace elements that reveal whether a diamond formed naturally in the earth or in a laboratory environment.
Advanced Testing Methods
When standard diamond testers can’t provide the distinction between natural and lab grown diamonds, gemological laboratories employ advanced scientific instruments that can detect subtle differences between these two types of diamonds. These sophisticated methods go far beyond what portable diamond testers can accomplish.
Spectroscopy is one of the primary advanced testing methods used by professional gemologists. Various forms of spectroscopy – including infrared, Raman, and photoluminescence – can identify specific growth patterns and trace elements unique to lab grown diamonds. For instance, HPHT lab diamonds often contain traces of nickel, while CVD lab diamonds may show silicon-related defects that aren’t typically found in natural diamonds.
At Bopie’s Custom Jewelry, we work with certified gemological laboratories when customers require definitive origin verification for their diamonds. These labs use instruments like DiamondView™, which uses short-wave UV imaging to reveal growth structures characteristic of either natural or lab grown diamonds.
X-ray topography is another advanced method that can map the internal structure of diamonds, revealing growth patterns that differ between natural and lab grown stones. Natural diamonds typically show octahedral growth patterns, while lab grown diamonds may display cubic or other distinctive growth structures depending on the manufacturing process.
Photoluminescence spectroscopy is particularly effective for detecting CVD lab grown diamonds. Under specific conditions, this technique can identify characteristic emissions from nitrogen-vacancy centers that form differently in lab grown diamonds compared to natural ones.
Major gemological laboratories like GIA, IGI, and HRD have invested millions in research and equipment to stay ahead of advancements in lab diamond technology. Each certified diamond they evaluate undergoes multiple tests using several different instruments, ensuring accurate identification of origin. This is why professional laboratory certification has become the gold standard for diamond verification, particularly for higher-value stones.
Consumer Tips for Verification
For consumers concerned about verifying whether they have a natural or lab grown diamond, there are several practical steps to take. While home diamond testers won’t provide this distinction, there are other ways to gain confidence in your purchase.
The most reliable method is to purchase diamonds with proper certification from reputable gemological laboratories. At Bopie’s Jewelry, all our diamonds come with certificates that clearly state whether the stone is natural or lab grown. Respected labs like GIA, IGI, and HRD use advanced testing methods to make this determination with certainty.
Always request and keep the certification documentation that comes with your diamond. These certificates include identifying information like measurements and unique characteristics that can be matched to your stone. Some labs even laser-inscribe identification numbers on the diamond’s girdle, viewable under magnification.
Be wary of unusually low prices for what appears to be a high-quality diamond. While lab grown diamonds are less expensive than natural diamonds, they still maintain significant value. If a deal seems too good to be true, it might indicate misrepresentation or, worse, a simulant being sold as a diamond.
Consider the reputation of the jeweler you’re purchasing from. Established jewelers like Bopie’s stake their reputation on honest representation of their merchandise. We clearly disclose whether diamonds are natural or lab grown and provide education about the differences and benefits of each option.
If you already own a diamond and are uncertain about its origin, professional appraisal is your best option. A qualified appraiser or gemologist can examine your stone and may recommend laboratory testing if