carat vs. color  length*  width*

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

0.3 Ct Sapphire (Round)


0.2 Ct Sapphire (Round)

4×4 mm 3.5×3.5 mm
actual size
Actual size of 0.3ct Sapphire   Actual size of 0.2ct Sapphire
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Yellow 0.3ct Sapphire on a ring
64 mm
Right finger image
Ring on a right finger
Blue 0.2ct Sapphire 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 0.3ct Sapphire Round (4×4mm, Yellow) and 0.2ct Sapphire Round (3.5×3.5mm, Blue) 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 gemstones (Rubies, Saphhires, Emeralds) and especially 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

The face-up size depends on the shape of the gem, its weight and 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.

0.3 Ct Sapphire (Round) 0.2 Ct Sapphire (Round)
4×4 mm vs 3.5×3.5 mm
12.57 mm²   9.62 mm²
Face-up size outline
Face-up size outline
0.3ct Sapphire Round (4×4mm)
0.2ct Sapphire Round (3.5×3.5mm)
Difference: 31% (2.95 mm²)
0.3ct Sapphire Round (4×4mm) has approx. 31% more face-up area than 0.2ct Sapphire Round (3.5×3.5mm).

Popular comparisons:

Enter your screen size (diagonal)

My screen size is  inches

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.