Lab created and simulated gemstones can look alike, but the terms describe different things: one refers to how a gemstone is made, while the other describes how it resembles another stone. Understanding that distinction helps you ask better questions and avoid treating appearance as proof of identity.
What does “lab created” mean?
A lab created gemstone is produced through a controlled process rather than forming naturally in the earth. In gemology, “lab grown,” “laboratory grown,” and “synthetic” commonly refer to materials that have essentially the same chemical composition and crystal structure as their natural counterparts. For example, laboratory grown ruby is corundum, just like natural ruby.
Lab created does not mean imitation or fake. It identifies the stone’s origin. A laboratory grown gemstone can have the same defining material properties as a natural gemstone, though it may contain growth features or inclusions that differ from those found in nature. Its origin can affect rarity, market demand, and value, so accurate disclosure matters.
What is a simulated gemstone?
A simulated gemstone, also called a simulant, is a material chosen to imitate the appearance of another gemstone. It may be glass, cubic zirconia, or a different natural or laboratory grown gem. A white sapphire, for instance, may be used to imitate a diamond, even though sapphire and diamond are different materials.
A simulant can be attractive and useful in jewelry, but visual resemblance does not make it the gemstone it imitates. A red glass stone may resemble ruby without being ruby. Likewise, a laboratory grown diamond is not a diamond simulant: it is diamond material made in a laboratory. A cubic zirconia made to resemble diamond is a simulant.
Lab created vs. simulated gemstones at a glance
| Term | What it describes | Material relationship to the named gem | Example |
|---|---|---|---|
| Lab created (lab grown or synthetic) | Where and how the gemstone formed | Typically the same essential composition and crystal structure as its natural counterpart | Lab grown ruby |
| Simulated (simulant) | A stone’s resemblance to another gemstone | May be a different material entirely | Cubic zirconia used to imitate diamond |
| Natural | Formation in nature | The gemstone material formed geologically | Natural sapphire |
These labels are not interchangeable. “Lab created” addresses origin; “simulated” addresses resemblance. A laboratory grown stone can also serve as a simulant for a different gem: lab grown sapphire used to imitate a natural-looking blue stone is still sapphire by material, but its role in that comparison is as a simulant.
What can appearance tell you?
Color, cut, clarity, and overall appearance can suggest what questions to ask, but they rarely establish a gemstone’s identity or origin on their own. Many natural, laboratory grown, and simulated stones are cut and polished to look similar. Lighting, camera settings, reflections, mounting, and image editing can further change how a stone appears in a photo.
Some stones show inclusions, growth patterns, or other features that an experienced gemologist may consider. These are clues, not universal rules. A clean-looking stone is not necessarily lab grown, and an inclusion does not by itself prove natural origin. Treatments can also alter a gemstone’s appearance, while some material differences cannot be reliably assessed from an ordinary photograph.
For these reasons, an online listing or phone photo cannot certify chemical composition, natural or laboratory origin, authenticity, treatment, or value. Do not rely on color alone, a seller’s informal description, or a visual comparison with a reference image as a final identification.
How can a gemstone be identified reliably?
Reliable identification may require examination with gemological instruments and methods suited to the specific stone. A qualified gemologist or independent gem testing laboratory can assess properties such as refractive behavior, optical character, inclusions, and spectroscopy results. The appropriate tests depend on the suspected material and the question being asked.
Identifying the material and determining its origin are separate tasks. A tester may establish that a stone is ruby, for example, but deciding whether that ruby formed naturally or in a laboratory can require further evidence. Treatments may also need separate assessment. No single method applies equally to every gem, and a report should clearly state its scope and findings.
A credible report from a qualified laboratory can be useful for a significant purchase, insurance documentation, or a disputed description. Check that the report refers to the stone you have and read its terminology carefully. A report may identify the gemstone and comment on origin or treatment, but its conclusions are limited to the examination performed.
Questions to ask before buying
- What material is the stone? Ask whether it is diamond, corundum, glass, cubic zirconia, or another material—not just what gem it resembles.
- Is it natural or laboratory grown? Request clear disclosure of origin where that distinction matters to you.
- Is it a simulant? Find out whether the stone is intended to imitate a different gemstone.
- Has it been treated? Ask what treatments are known or disclosed, and whether they affect care or durability.
- Is there an independent report? For a valuable stone, ask who issued it, what it identifies, and whether the report can be matched to the item.
- What is the return policy? A reasonable opportunity for independent examination can help resolve uncertainty.
Why the distinction matters
Lab created and simulated stones can both be legitimate jewelry choices, but they represent different products. Someone seeking the properties of a particular gemstone may prefer a laboratory grown version of that same material. Someone prioritizing appearance or a lower-cost lookalike may choose a simulant. Neither choice should be misrepresented as something else.
Descriptions matter because composition, origin, treatments, durability, rarity, and market value are not the same for every material. Before buying or selling, use precise terms and request documentation appropriate to the item. When identity or origin has financial importance, professional examination is more dependable than trying to decide from appearance alone.