4.5 mm Round Lab-Grown Diamond, Loose

A 4.5 mm round lab-grown diamond, D to F color, VVS clarity, sold individually. This is the most requested loose stone size at Thảo Linh.

Why 4.5 mm is the easiest size to buy

Most ready-made single-stone rings, pendants and earrings on the market have seats cut around this size. Buying a 4.5 mm stone means a much better chance of finding a setting that fits, and an easier time finding a replacement later.

That has a downside too: because it's so common, this size feels less distinctive. If you want your piece to look different from the crowd, consider 5 mm or a non-round shape.

As the center of a small piece

At 4.5 mm, the stone is large enough to stand alone as the center of a plain ring or pendant without accent stones. It's a sensible choice for an everyday ring, an anniversary gift, or a first piece for yourself.

As a center stone, cut matters far more than it does for accents. A well-cut stone this size still throws clear fire, while a poorly cut one looks dull even in D color.

Setting and choosing a seat style

A high setting lifts the stone off the hand and lets light in from below, so it sparkles more, but it catches and knocks more easily. A low setting is more durable for people who work with their hands, at the cost of a little fire. Our setters will advise based on how you wear it.

If you already have a setting, bring it in so we can measure the seat before you buy the stone, so you don't end up with a stone that won't fit.

Care

Take it off when washing your hands with heavy soap, applying lotion or spraying perfume. These build up under the stone and dull it faster than anything else.

Wash with warm water and a soft brush, and drop by every few months to have the prongs checked, especially if you wear the ring on your dominant hand.