When shopping for a tennis necklace, the biggest decision you'll face isn't the length or the width — it's the stone. Moissanite and diamond are the two dominant choices in 2026, and each has a compelling case. Here's an honest, side-by-side breakdown to help you decide.
What Is Moissanite?
Moissanite is a lab-grown gemstone originally discovered in a meteor crater. Today, it's engineered to near-perfection — with a refractive index of 2.65 (higher than diamond's 2.42), meaning it produces more fire and brilliance per carat. VVS moissanite, like the stones used in our GC Éclat Tennis Necklace, represents the highest clarity grade available.
What Is a Diamond Tennis Necklace?
A diamond tennis necklace uses either natural or lab-grown diamonds set in precious metal. Our Lumière Tennis Necklace is the definitive example, crafted in solid 14K gold (white or yellow) and set with precision-cut diamonds in a 4-prong setting. Available with lab-grown diamonds (5₇₈ CTW, from $7,100) or natural diamonds (from $11,100), it represents the pinnacle of fine jewelry craftsmanship.
Brilliance & Fire
Moissanite has a higher refractive index (2.65 vs 2.42), producing more rainbow-like fire. Diamonds deliver a more classic, controlled brilliance that fine jewelry connoisseurs recognize instantly. Both are stunning — the choice comes down to the look you prefer. The GC Éclat showcases moissanite brilliance beautifully, while the Lumière delivers the timeless diamond sparkle.
Hardness & Durability
Diamond scores 10 on the Mohs scale — the hardest natural material on earth. Moissanite scores 9.25, making it the second hardest gemstone used in jewelry. For everyday wear, both are exceptionally durable. The Lumière Tennis Necklace is finished with a secure box clasp and set in solid 14K gold, engineered for a lifetime of wear.
Price
This is where the two diverge most significantly. A moissanite tennis necklace like the GC Éclat offers exceptional brilliance at an accessible price point. A diamond tennis necklace like the Lumière is a true fine jewelry investment, starting at $7,100 for lab-grown and $11,100 for natural diamonds, reflecting the rarity and prestige of real diamonds set in solid 14K gold.
Ethics & Sustainability
Both options can be ethical. Moissanite is always lab-grown. The Lumière Tennis Necklace offers a lab-grown diamond option for buyers who want the prestige of a real diamond with a lower environmental footprint.
Which Should You Choose?
If you want maximum brilliance at an accessible price, the GC Éclat Tennis Necklace in VVS moissanite is the answer. If you want a true fine jewelry heirloom — solid 14K gold, real diamonds, and a piece that holds its value — the Lumière Tennis Necklace is in a class of its own. For men who want a bold statement piece, the Tennis Chain 5mm rounds out the collection perfectly.
