For lovers of antique jewellery, there's nothing quite like the thrill of discovering a piece adorned with a stunning gemstone. However, when it comes to assessing the quality of these gemstones, it's important to know what to look for.

As a certified gemologist, I use a systematic approach that encompasses the four Cs: Color, Clarity, Cut, and Carat. This guide will help you understand these factors and assist you in making informed decisions when selecting antique gemstone jewellery.

Colour

Colour is a crucial aspect when assessing gemstone quality. High-quality gemstones exhibit rich, saturated colors, neither too dark nor too light. The most desirable gemstones show even colour throughout, with minimal color zoning or inconsistencies.

Clarity

Clarity refers to the presence of internal or external flaws, known as inclusions or blemishes. A high-quality gemstone should allow light to pass through unimpeded, and shouldn't appear cloudy or hazy. However, in certain gemstones like rubies and emeralds, some inclusions can add value or prove authenticity.

Cut

The cut of a gemstone impacts how it reflects light, thus influencing its brilliance. Antique gemstones might not have the precision-cut facets of modern ones, but they should still exhibit balanced proportions and symmetry to enhance their natural beauty.

Carat

Carat refers to the weight of the gemstone rather than its size. While larger stones are inherently rarer and often more valuable, the size should never compromise the other three Cs. It's crucial to consider all these factors in harmony to truly assess a gemstone's quality.

Evaluating the quality of gemstones in antique jewellery can be complex, but understanding the four Cs provides a valuable starting point.

However, it's always advisable to consult with a certified gemologist when purchasing antique jewellery to ensure you're making an informed investment.

Remember, each piece of antique jewellery tells a unique story, and its value often extends beyond just the physical gemstone. It's about the history, craftsmanship, and sentimental value that make each piece truly special.