3 mm Round Lab-Grown Diamond, Loose

A 3 mm round lab-grown diamond, D to F color, VVS clarity, sold individually. This is the smallest and most affordable size among Thảo Linh's loose stones.

Where a 3 mm stone sits in a piece of jewelry

Three millimetres is pure accent-stone territory: paved along a ring band, set tight around a center stone, or filling the face of a multi-stone pendant. The eye doesn't see each stone but one continuous patch of light, and that is exactly the effect this size creates.

A piece using 3 mm stones usually needs dozens to over a hundred of them. So most purchases at this size are in quantity; buying a single stone almost only happens when replacing one that fell out.

Quantity matters more than the quality of each stone

At 3 mm, the difference between D and H color is practically invisible to the naked eye, even for people in the trade without a loupe. What you can see is how uniform the whole patch is: a few off-tone stones next to each other create a dark streak across the piece.

So when ordering, the most important thing is to buy all the stones you need in one go. Running short and topping up later is when mismatched tones are most likely.

Setting and inspection

Stones this size are held by small gold beads raised around the edge instead of separate prongs. The setter places the stone, pushes the beads over it, then checks every stone under a loupe before polishing.

This is the most labor-intensive step in a piece with many accent stones, and it decides whether stones will fall out later. A loose stone at this size can't be spotted with the naked eye.

Caring for a fully set piece

A surface full of tiny gaps collects dust, lotion and soap very quickly, dulling the whole area even though every stone is still in place. Wash with warm water and a soft brush, rinse well and dry.

Check the beads holding the stones every few months, especially on a ring worn on your dominant hand. A worn bead means a stone about to fall out.