logo

Shop

Gifts

Our Story

Bespoke

logo

The Ultimate Guide to Checking Gold Purity

by Stephanie Kim 18 Aug 2025 2 min read

Gold has long been celebrated as a symbol of beauty and value, making its purity an essential factor when selecting jewelry. Whether you're choosing a piece for personal adornment or as an investment, understanding and verifying gold's authenticity is crucial. Follow this guide to help you make confident, informed choices for your collection.

How is Gold Purity Measured?

Gold purity, measured in karats (denoted as "k" or "kt"), signifies the proportion of gold in an alloy. Pure gold is 24 karat (24k), comprising 99.9% gold. Alloys like 18k, 14k, and 10k gold blend gold with other metals to enhance durability and alter appearance, each representing varying purity levels.

  • 24k: 99.9% pure gold
  • 18k: 75% pure gold, 25% alloy metals
  • 14k: 58.3% pure gold, 41.7% alloy metals
  • 10k: 41.7% pure gold, 58.3% alloy metals
  • For further explanation of how each karat differs, refer to our Essential Gold Purity and Color Guide.

    Now that we've covered the basics, let's delve into how you can determine gold purity in the selection of your jewelry pieces!

    Gold Hallmark

    A gold hallmark is a stamp or mark applied to gold jewelry to indicate various attributes, including purity, manufacturer's identity, and sometimes the country of origin.

    It typically includes numeric values representing the karat purity (e.g., "18k" or "750" for 18 karat gold) and symbols or letters denoting the manufacturer or country of origin. The hallmark serves as a guarantee of the gold's quality and authenticity, and it's a standard practice in the industry.

    Purity Markings

    Purity markings on gold jewelry indicate the percentage of pure gold in the alloy, such as "18k" for 75% purity or "585" for 58.5%. These markings, often near the hallmark, provide essential information about the gold's composition.

    Gold hallmarks and purity markings are usually engraved on the piece or attached with a tag. If you can't find them, ask your retailer for confirmation to ensure you're purchasing genuine solid gold. Extra proof will give you confidence in your purchase!

    Professional Tests

    Professional gold testing methods, such as acid testing, X-ray fluorescence (XRF), and electronic machines, accurately determine gold purity. These tests, performed by trained experts using specialized equipment, adhere to industry standards for precise results. We recommend leaving this to the professionals rather than attempting at home to avoid damage to your precious jewelry!

  • Acid Testing: In acid testing, a small gold sample is exposed to acids of different concentrations. The tester observes the reaction, particularly color changes, to determine the gold's purity. Higher karat gold shows minimal reaction due to its higher purity.
  • X-ray Fluorescence (XRF) Analysis: XRF analysis involves irradiating the gold with X-rays, which causes it to emit its own X-rays. The XRF machine then analyzes these emissions to determine the gold's elemental composition and purity. This method is non-destructive and provides fast, accurate results, making it popular for assessing gold jewelry and bullion.
  • Electronic Gold Testing Machines: These machines test gold purity by measuring its electrical conductivity. A probe is placed on the gold, and an electrical current is passed through it. The machine compares the conductivity to known standards, determining the gold's purity. This method is portable, user-friendly, and commonly used in jewelry stores and pawnshops for quick, reliable results.
  • How Does AURÉV Ensure Purity Authenticity?

    At AURÉV, we are committed to delivering the highest quality jewelry, supported by certifications and authenticity guarantees. Every piece undergoes rigorous testing with XRF technology to confirm it's 18k gold and free from nickel or brass. This ensures you can shop with confidence, knowing your AURÉV jewelry is genuine and of the finest quality.

    We use exclusively 18k solid gold for its exceptional durability, purity, and timeless appeal. You can easily identify our pieces by the hallmark and purity markings engraved on clasps, earring backings, and ring interiors. With AURÉV, each piece is a symbol of luxury and elegance designed to last a lifetime.

    Company

    Contact

    visamastercardunionpay
    logo