STONE GUIDE

What is Cubic Zirconia (CZ)?

Cubic zirconia is a high-quality, lab-created stone known for its exceptional brilliance and clarity. When expertly cut and set, it offers the luminous look of a diamond with a smooth, even sparkle. At Leni James, we use premium-grade cubic zirconia chosen for its beauty, durability, and consistency—designed for everyday wear and effortless elegance.

What is Moissanite?

Moissanite is a lab-created gemstone celebrated for its fire and brilliance, often exceeding that of a diamond. It is highly durable and offers a look and feel closer to fine jewelry, making it an ideal choice for those seeking a higher-carat appearance and long-term wear, while remaining more accessible than natural diamonds.

What is a Lab-Grown Diamond?

Lab-grown diamonds are real diamonds—chemically, physically, and optically identical to mined diamonds—created in controlled laboratory environments. They offer the same hardness, sparkle, and prestige as natural diamonds, with a more modern and responsible approach to fine jewelry.

Lab-grown diamonds can be a great alternative for larger center stones or higher carat weights. However, for pavé or smaller stones, the price difference does not justify choosing lab-grown over natural diamonds. Since every lab-grown diamond is created from a tiny natural diamond seed, the value becomes meaningful only at higher carat weights, where the scale truly makes a difference.

Our fine jewelry collection features only natural diamonds, carefully selected for their timeless value.

Which stone should I choose?

Each stone serves a different intention:

• Cubic Zirconia is perfect for everyday luxury—iconic designs, effortless sparkle, and timeless style.

• Moissanite is ideal if you’re looking for a stone closer to fine jewelry, with exceptional brilliance and durability.

• Lab-grown diamonds are for those seeking the ultimate fine jewelry experience while maximizing your budget on higher carat weights.

• Natural diamonds for their earth connection and the ultimate fine jewelry experience.

Materials & Care

All Leni James tennis necklaces and bracelets are crafted in 14K gold and in sterling silver with a high-quality protective plating, designed to maintain its color and shine without tarnishing or changing over time, with proper care. Each piece is made to be worn, loved, and layered, day after day.