carat vs. color  length*  width*

(or examine a single gem)
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3.33 Ct Quartz (Round)


4 Ct Diamond (Round)

orangey red
10×10 mm 10.32×10.32 mm
actual size
Actual size of 3.33ct Quartz   Actual size of 4ct Diamond
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Orangey Red 3.33ct Quartz on a ring
64 mm
Right finger image
Ring on a right finger
White 4ct 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 3.33ct Quartz Round (10×10mm, Orangey Red) and 4ct Diamond Round (10.32×10.32mm, 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, Diamond will face-up smaller than Quartz for a given carat weight, because it has higher specific gravity (3.52 vs. 2.65 - this means it's "heavier" compared to Quartz 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.

3.33 Ct Quartz (Round) 4 Ct Diamond (Round)
10×10 mm vs 10.32×10.32 mm
78.54 mm²   83.65 mm²
Face-up size outline
Face-up size outline
3.33ct Quartz Round (10×10mm)
4ct Diamond Round (10.32×10.32mm)
Difference: 7% (5.11 mm²)
4ct Diamond Round (10.32×10.32mm) has approx. 7% more face-up area than 3.33ct Quartz Round (10×10mm).

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.