carat vs. color  length*  width*

(or examine a single gem)
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1.5 Ct Zircon (Round)


1.5 Ct Diamond (Round)

6.51×6.51 mm 7.44×7.44 mm
actual size
Actual size of 1.5ct Zircon   Actual size of 1.5ct Diamond
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 1.5ct Zircon on a ring
64 mm
Right finger image
Ring on a right finger
White 1.5ct Diamond on a ring
Your settings
Skin tone
Ring diameter
16.9 mm
Ring width
3.0 mm
Finger length
64 mm
Ring diameter: 16.9 mm
Actual sizes of 1.5ct Zircon Round (6.51×6.51mm, White) and 1.5ct Diamond Round (7.44×7.44mm, White) as they would appear on a ring and finger. Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.

Where to buy?

JamesAllen → high-quality Diamonds, high-end jewelry and competitive prices. Highly recommended.
Amazon → usually offers a good selection from many different vendors. Worth a check.

Face-up Size

All things being equal, Zircon will face-up smaller than Diamond for a given carat weight, because it has higher specific gravity (4.65 vs. 3.52 - this means it's "heavier" compared to Diamond of the same size). Face-up size also depends heavily on the proportions of the cut.

Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.

1.5 Ct Zircon (Round) 1.5 Ct Diamond (Round)
6.51×6.51 mm vs 7.44×7.44 mm
33.29 mm²   43.47 mm²
Face-up size outline
Face-up size outline
1.5ct Zircon Round (6.51×6.51mm)
1.5ct Diamond Round (7.44×7.44mm)
Difference: 31% (10.18 mm²)
1.5ct Diamond Round (7.44×7.44mm) has approx. 31% more face-up area than 1.5ct Zircon Round (6.51×6.51mm).

Popular comparisons:

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Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.