3.9 mm Round Lab-Grown Diamond, Loose
Product code: KCR-17910
Quantity
Loose round lab-grown diamond, 3.9 mm, D–F color, VVS clarity, sold per stone. For setting in rings, earrings, pendants or as accents. No individual grading report per stone.
Jewelry details
A 3.9 mm round lab-grown diamond, D to F color, VVS clarity, sold individually. This size sits just above 3.6 mm, only 0.3 mm larger, but it is used for different things.
How 3.9 mm differs from 3.6 mm
It sounds like only three tenths of a millimetre, but the face area grows with the square of the diameter, so a 3.9 mm stone looks clearly bigger side by side. On a row of stones along a ring band, switching from 3.6 to 3.9 mm changes the whole feel of the piece.
The two sizes aren't interchangeable. A seat cut for 3.6 mm won't take a 3.9 mm stone, and a 3.6 mm stone in a 3.9 mm seat can't be reached by the prongs. Before ordering, you need to know for sure which size your seat is.
Used as side stones
Beyond accent work, 3.9 mm is large enough to serve as the side stones flanking the center in a small three-stone ring, or as accents at both ends of a pendant. In that role each stone stands on its own, so color and cut start to matter more than when it's lost in a row of accents.
If you're using them as side stones, buy the pair at the same time. Two stones from the same lot match in tone and fire; bought at different times, one may look warmer than the other.
Setting and inspection at our workshop
Our setter weighs the stone before setting and checks the prongs afterwards. For a feature stone, the setter also makes sure its face sits level with the surrounding stones, because even a slight tilt reflects light unevenly and shows immediately.
If you already have a setting, bring it in so our setter can measure the seat directly. If not, choose a design on our website and tell us the stone size — the workshop will cut the seat to that exact measurement.
Everyday care
Take your jewelry off when washing dishes, using cleaning chemicals or swimming. Pool chlorine doesn't harm diamonds but corrodes the gold that holds them, and worn prongs are the most common reason stones fall out.
Clean with warm water and mild soap, brush gently, rinse and dry with a soft cloth. An ultrasonic polish every few months brings back the original brilliance.
