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Short answer: A 1.5 carat round stone is about 7.3–7.4 mm across, clearly larger than a 1 carat on the hand. It is a strong value choice with lab grown diamonds: at Ivevar, moving from a 1 carat to a 1.5 carat center in our round lab diamond solitaire adds $217, taking it to $1,863 in 14K gold. A 1.5 carat moissanite solitaire is $1,435 in 14K gold (prices at the time of writing).
Why 1.5 Carats Is a Sweet Spot
With mined diamonds, prices jump steeply as carat weight rises. Lab grown diamonds have a much gentler price curve, so stepping up from 1 to 1.5 carats costs relatively little while giving a visibly bigger stone. A 1.5 carat also works with almost every shape and setting, from a slim solitaire to a halo.
Real Ivevar Prices for a 1.5 Carat Center Stone
| Ring (1.50 ct center) | 925 Silver | 10K Gold | 14K Gold | 18K Gold |
|---|---|---|---|---|
| Round Lab Diamond Cathedral Solitaire | $867 | $1,593 | $1,863 | $2,133 |
| Four Prong Cushion Lab Diamond Solitaire | $883 | $1,775 | $2,107 | $2,439 |
| Six Prong Round Lab Diamond Solitaire | $974 | $1,804 | $2,113 | $2,422 |
| Round Moissanite Pavé Band Solitaire | $297 | $1,127 | $1,435 | $1,744 |
Prices at the time of writing; check each product page for current prices and stone details.
Best Settings and Shapes at 1.5 Carats
A six-prong setting holds a larger round stone securely and makes it look rounder. Cushion and oval shapes look generous at this size. Because a 1.5 carat stone sits higher, a cathedral or low-profile setting is worth comparing for comfort if you work with your hands.
Getting the Most Sparkle
Cut matters more than a few extra points of weight. A well-cut stone reflects more light and looks brighter and larger than a poorly cut one of the same carat. For lab grown diamonds, an IGI report shows the full cut, color and clarity grades; GIA has given only a Premium or Standard descriptor for lab grown diamonds since October 1, 2025.
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Frequently Asked Questions
How big is a 1.5 carat diamond?
A well-cut round 1.5 carat is about 7.3 to 7.4 mm across, roughly 1 mm wider than a 1 carat.
How much does a 1.5 carat lab grown engagement ring cost at Ivevar?
At the time of writing, our round lab diamond solitaire with a 1.5 carat center is $867 in sterling silver and $1,863 in 14K gold.
Is 1.5 carat better value than 2 carat?
It depends on your budget. 1.5 carat looks clearly larger than 1 carat, and a 2 carat adds another visible step for a little more.
