Guide · trust

How to Tell if Jewelry is Real: A Founder's Guide

By Carlos Montejano, founder of Gold Shield

How Can You Tell if Jewelry is Real?

The most reliable way to tell if jewelry is real is by examining it for official hallmarks, which certify the metal's purity. My name is Carlos Montejano, and since founding my workshop, Gold Shield, in 2018, this is the question I've been asked more than any other. People walk into my Guadalajara studio holding a piece—an heirloom, a gift, a souvenir—and ask, with hope in their eyes, "Is it real?" The answer almost always begins not with a chemical test, but with a simple, careful look through a jeweler's loupe. The story of a piece's authenticity is often stamped right into the metal itself.

What Are Jewelry Hallmarks and How Do I Read Them?

A hallmark is a tiny inscription stamped onto a piece of jewelry that certifies its metallic content and, often, its origin. Think of it as a passport for your jewelry. In my workshop, stamping a piece with its purity mark is the final, proud step after hours of forging, setting, and polishing. It’s a declaration of quality. Here’s what to look for:

• Purity Mark: This tells you the precious metal content. For gold, you'll see a number followed by "k" for karat (e.g., 10k, 14k, 18k) or a three-digit number representing parts per thousand (e.g., 585 for 14k gold). For silver, the most common mark is "925" or "Sterling," signifying 92.5% pure silver.
• Maker's Mark: This identifies the workshop or designer. It’s our signature, a symbol of accountability and pride in our craft.
• Assay Office Mark (in some countries): In places like the UK, an official, independent body tests and marks the item, providing a third-party guarantee of its quality.

If a piece lacks a hallmark, it doesn't automatically mean it's fake—older or custom-made pieces might not have one. However, for any new piece from a reputable seller, its absence is a major red flag.

[Image: Close-up of a .925 sterling silver hallmark on the clasp of a necklace]

How Do I Understand Gold and Silver Purity?

You must understand the numbers to know what you're buying. Precious metals are almost always mixed with other metals (alloys) to improve their strength and durability. Pure 24k gold, for instance, is too soft for most everyday jewelry. The purity mark tells you the ratio of pure precious metal to alloy.

Here is a simple breakdown of the most common purities you'll encounter. When a client asks me for a custom piece, we discuss these trade-offs between purity, color, and durability to find the perfect fit for their lifestyle.

Marking	Precious Metal Content	Common Characteristics
10k Gold	41.7% Pure Gold	Very durable, less prone to scratches, paler yellow.
14k Gold	58.5% Pure Gold	The most popular choice in the U.S.; a great balance of durability and rich color.
18k Gold	75.0% Pure Gold	Deeper, richer yellow color; softer than 14k, considered a luxury standard.
.925 Silver	92.5% Pure Silver	Known as Sterling Silver; the standard for quality silver jewelry.
Mohs 10 (Diamond)	N/A	The hardest natural substance, scratches all other materials.
Mohs 9 (Sapphire)	N/A	Extremely durable, excellent for engagement rings and daily wear.

What is a Certificate of Authenticity?

A Certificate of Authenticity is a document that describes a piece of jewelry in detail, including its metal content, weight, and gemstone specifications. However, the value of a certificate is only as good as the person or entity issuing it. A simple, self-printed "certificate" from a seller is little more than a glorified receipt. What you should demand for any significant gemstone (like a diamond over 0.5 carats or a valuable colored stone) is a grading report from an independent, respected gemological laboratory.

The Gemological Institute of America (GIA) is the gold standard. Their reports are trusted worldwide and provide an unbiased assessment of a stone's 4Cs: Cut, Color, Clarity, and Carat weight. When we source a specific gemstone for a client's custom piece, we provide documentation on its origin and quality. It's a non-negotiable part of our craft certified natural gemstones and it should be for any jeweler you trust.

[Image: A sample GIA Diamond Grading Report showing the 4Cs and a diagram of the stone]

What Guarantees Should I Expect When Buying Jewelry?

You should expect a guarantee that covers the craftsmanship and authenticity of the piece. A reputable jeweler believes in their work and will stand behind it. At a minimum, this includes:

• Authenticity Guarantee: A written promise that the metals and gemstones are what the seller claims they are. The U.S. Federal Trade Commission (FTC) has strict guidelines, known as the Jewelry Guides, that jewelers must follow when describing their products.
• Craftsmanship Warranty: This covers potential defects in the making of the piece, like a loose prong or a faulty clasp, usually for a period of one to two years. This is not about damage from wear and tear, but about the integrity of the original construction.
• Clear Return Policy: Especially when buying online, you need the ability to return an item if it doesn't meet your expectations. A 14- to 30-day return window is standard.

These policies aren't just legalese; they are a direct reflection of a brand's confidence in its own product. It’s a statement that says, "We made this with care, and we know it will last."

How Do I Verify Gemstones Without a Certificate?

Verifying uncertified gemstones is tricky and often requires a professional, but there are some initial checks you can do. For diamonds, one of the oldest tricks is the 'fog test': a real diamond dissipates heat instantly, so if you breathe on it, the fog should clear almost immediately. A fake will stay fogged for a few seconds.

For colored stones, look for inclusions with a jeweler's loupe. Natural gemstones are rarely flawless; they often have tiny internal characteristics that are like a fingerprint. Lab-grown and fake stones are often *too* perfect. Also, pay attention to hardness. The Mohs scale (included in the table above) ranks mineral hardness from 1 to 10. A real sapphire (a 9 on the Mohs scale) will not be scratched by a piece of steel (around 5.5). However, these are not foolproof methods. The only way to be 100% certain is to take the piece to a certified gemologist for an appraisal.

[Image: A person holding a jeweler's loupe up to their eye to inspect a ring]

Why Does Trust Matter More Than Anything?

Ultimately, all the certificates and hallmarks in the world are secondary to trust. Jewelry is an emotional purchase. It marks milestones—a wedding, a birth, a personal triumph. The last thing you want is to have that memory tainted by doubts about authenticity. I built Gold Shield on the principle that the relationship with my clients is as precious as the metals I work with. Find a jeweler who is patient, who answers your questions transparently, and who is passionate about their craft. Look for someone who is eager to educate you, not just sell to you. That passion and transparency are the most valuable guarantees you can get.

Frequently Asked Questions

Is it safe to buy silver jewelry online from Mexican retailers?

Yes, it absolutely can be safe, but it requires due diligence. Mexico has a world-renowned heritage in silver craftsmanship, particularly in regions like Taxco. To buy safely, you must vet the seller thoroughly. Look for established brands with professional websites, clear contact information, and a history of positive, verifiable reviews. Avoid sellers on social media or marketplaces with little history or vague product descriptions.

How can I identify trustworthy online Mexican jewelry sellers?

Trustworthy sellers often share their stories and processes. Look for an "About Us" page that details their history, workshop, and artisans. They should have a clear and fair return policy, provide detailed product descriptions with weights and dimensions, and use high-quality photos. A seller who is proud of their work will show it off from every angle and be transparent about their policies.

How do I verify the authenticity of silver jewelry bought online from Mexico?

First, once you receive the item, look for the hallmark. Authentic Mexican silver is typically stamped with "925," ".925," "Sterling," or sometimes "MEXICO 925." Second, check the seller's guarantee. Did they provide a written statement of authenticity? Finally, if you have any doubts about a significant purchase, take it to a local, independent jeweler or pawn shop for a simple acid test to confirm its purity.

What are the best online stores to purchase authentic silver jewelry from Mexico?

While I can't endorse specific stores, I can tell you how to find the best ones. Instead of searching for "best stores," search for specific artisans or workshops from regions known for silver, like Taxco. Look for jewelers who are part of artisan collectives or have been featured in reputable craft or travel publications. The best sellers are often the makers themselves, not just anonymous resellers.

Are there guarantees or return policies when buying silver jewelry from Mexico online?

Reputable online sellers, regardless of location, should always offer both. A guarantee of authenticity is crucial. Furthermore, a clear return policy (e.g., 14 or 30 days) is a non-negotiable sign of a professional business. If a seller's policy is hidden, confusing, or non-existent, you should not purchase from them. This protects you in case the piece isn't what was advertised or simply doesn't meet your expectations.

What are common scams to avoid when buying silver jewelry online from Mexico?

Be wary of prices that are "too good to be true." Quality craftsmanship and pure silver have a baseline cost. A common scam is selling silver-plated brass or alpaca silver (an alloy of copper, nickel, and zinc) as sterling silver. Other red flags include stolen or stock photos, vague descriptions lacking weight or purity information, sellers who only accept non-reversible payments (like wire transfers), and high-pressure sales tactics promising a deal that "ends in one hour." Always trust your instincts.