carat vs. color  length*  width*

(or examine a single gem)
* size in mm (optional)

2.7 Ct Ruby (Pear)


3 Ct Diopside (Emerald)

10×7 mm 9.81×7.27 mm
actual size
Actual size of 2.7ct Ruby   Actual size of 3ct Diopside
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 2.7ct Ruby on a ring
64 mm
Right finger image
Ring on a right finger
Green 3ct Diopside 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 2.7ct Ruby Pear (10×7mm, Red) and 3ct Diopside Emerald (9.81×7.27mm, Green) 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 Rubies, 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, Ruby will face-up smaller than Diopside for a given carat weight, because it has higher specific gravity (4 vs. 3.3 - this means it's "heavier" compared to Diopside 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.

2.7 Ct Ruby (Pear) 3 Ct Diopside (Emerald)
10×7 mm vs 9.81×7.27 mm
51.1 mm²   66.33 mm²
Face-up size outline
Face-up size outline
2.7ct Ruby Pear (10×7mm)
3ct Diopside Emerald (9.81×7.27mm)
Difference: 30% (15.23 mm²)
3ct Diopside Emerald (9.81×7.27mm) has approx. 30% more face-up area than 2.7ct Ruby Pear (10×7mm).

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.