carat vs. color  length*  width*

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

25 Ct Quartz (Round)


25 Ct Emerald (Trillion)

light yellow
light green
20.05×20.05 mm 23.43×23.43 mm
actual size
Actual size of 25ct Quartz   Actual size of 25ct Emerald
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Yellow 25ct Quartz on a ring
64 mm
Right finger image
Ring on a right finger
Light Green  25ct Emerald 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 25ct Quartz Round (20.05×20.05mm, Light Yellow) and 25ct Emerald Trillion (23.43×23.43mm, Light 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 Emeralds, 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, Emerald will face-up slightly smaller than Quartz for a given carat weight, because it has higher specific gravity (2.7 vs. 2.65 - this means it's "slightly 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.

25 Ct Quartz (Round) 25 Ct Emerald (Trillion)
20.05×20.05 mm vs 23.43×23.43 mm
315.73 mm²   340.36 mm²
Face-up size outline
Face-up size outline
25ct Quartz Round (20.05×20.05mm)
25ct Emerald Trillion (23.43×23.43mm)
Difference: 8% (24.63 mm²)
25ct Emerald Trillion (23.43×23.43mm) has approx. 8% more face-up area than 25ct Quartz Round (20.05×20.05mm).

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.