Size guides › Compare sizes
Side by side
Compare diamond sizes side by side
Is 1.25 ct really worth it over 1 ct? Will an oval look bigger than a round for the money? Put two diamonds on the same hand, at the same scale, and see the difference for yourself.
Free. Your photo stays on your phone.
Same hand, same scale
A 1 ct oval looks about as big as a 1.12 ct round — so next to a 1.25 ct round it shows 7% less diamond from above while weighing a quarter-carat less. Close up, on the same measured hand:
Popular comparisons
Drawn to scale on a millimeter grid. Tap any pair to see both on a hand.
Half a carat more weight
The 1.5 ct round shows 31% more diamond from above than the 1 ct round.
See both on a hand →Same weight, different shape
The 1 ct oval shows 8% more diamond from above than the 1 ct round.
See both on a hand →Just under a price step
The 1 ct round shows 7% more diamond from above than the 0.9 ct round.
See both on a hand →A deep cut against a round
The 1.5 ct round shows 12% more diamond from above than the 1.5 ct cushion.
See both on a hand →Two pointed shapes
The 1 ct marquise shows 7% more diamond from above than the 1 ct pear.
See both on a hand →Step cut vs brilliant
The 2 ct emerald shows 10% more diamond from above than the 2 ct radiant.
See both on a hand →Shape against shape, at every weight: Oval vs Round · Princess vs Cushion · Emerald vs Radiant · Pear vs Marquise
How to compare in the tool
Start with one diamond
Pick a shape and a size and see it on your hand.
Tap "Compare with a bigger size"
It adds a second stone a quarter-carat up. Change its shape or size to anything you like.
One at a time, or side by side
Flip between them on the same photo, or put them next to each other on a larger screen.
Compare on your own hand
The difference between two sizes depends on your finger. See both at their real size on a photo of your hand.
Questions
Is a 1.25 carat diamond noticeably bigger than a 1 carat?
It's 25% heavier but only about 16% bigger from above for a round — 6.44 mm against 6.93 mm across. Whether that's noticeable depends on your hand, which is exactly what comparing on your own photo shows.
Does an oval look bigger than a round?
Yes, at the same weight. A 1 ct oval covers about as much area as a 1.12 ct round.
How many diamonds can I compare?
Several at once. Add them in the tool and switch between them on the same photo, or view two side by side.