How to Tell If a Gemstone Is Real?
At JennyBay Diamond, as trusted gemstone wholesaler Australia, we often receive questions about gemstone authenticity. With so many lab-created stones and treatments in the market, it’s normal to ask: How do I know if my gemstone is real?
Here are the most frequently asked questions—answered by our experts at our Sydney gemstone wholesale and Melbourne gemstone offices.
Q1: How can I tell if a gemstone is real at home?
While professional tools are always best, here are a few basic checks you can try:
- Fog Test (for diamonds): Breathe on the stone. Real diamonds disperse heat quickly and shouldn’t fog up for more than a second.
- Magnification Test: Use a loupe to look for inclusions. Natural stones usually have small imperfections.
- Weight & Feel: Synthetic gems may feel lighter or unusually perfect.
Still unsure? Visit a gemstone wholesale showroom near you in Sydney or Melbourne or Perth for a free assessment.
Q2: Can a jeweller or supplier verify a gem’s authenticity?
Yes. A professional gemstone supplier in Australia can conduct tests using:
- Refractometer
- Polariscope
- Spectroscope
- UV light
- Thermal conductivity probes (for diamonds)
At JennyBay Diamond, we offer authenticity checks as part of our wholesale services.
Q3: What’s the difference between lab-created and natural gemstones?
Lab-created gems:
- Have the same chemical structure as natural stones
- Are generally flawless
- Cost significantly less
- Are rarer and increase in value over time
- Often come with visible inclusions and character
- Are more sought-after for investment
Whether you’re looking for emerald wholesale or a natural ruby supplier, always ask for certification.
Q4: How do I know if my gemstone has been treated?
Heat treatment is common for rubies and sapphires. Ask your gemstone supplier:
- Has this gem been heat-treated, fracture-filled, or coated?
- Is it disclosed on the certificate?
We always disclose treatments at our Sydney gemstone wholesale and Melbourne gemstone locations.
Q5: Do synthetic diamonds or sapphires test as real?
Yes, some lab-grown diamonds can pass basic thermal tests. However:
- Advanced gemological tools can tell the difference
- Always look for a GIA certificate
Q6: What certificates should I ask for when buying wholesale gemstones?
Ask for:
- GIA GRS AIGS Lotus certificates
- Full treatment disclosure
- Source information (especially for ethical sourcing)
This is especially important for emerald wholesale purchases or when sourcing from a ruby supplier.
Q7: Where can I buy certified gemstones in Australia?
In-house gemologists
Certification with every purchase
Transparent sourcing
Physical showrooms
Q8: Is it safe to buy gemstones online?
Yes—but only from trusted businesses that:
- Provide certificates
- Offer returns
- Have real reviews and offices you can visit
JennyBay Diamond offers Australia-wide shipping from our gemstone wholesale hubs in Sydney and Melbourne.
Need Help?
Looking for a reliable emerald wholesale, ruby supplier, or general gemstone supplier Australia-wide?
Visit our Sydney gemstone wholesale showroom or Melbourne gemstone office or Perth Gemstone Sourcing office.
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