20 Carat Ruby (Round, 16.23mm, Red)
Color:
Actual size is set for screen
How big is a 20 carat round-cut Ruby?
It depends on the cut proportions, but typically a 20ct round-cut Ruby would measure around 16.23 mm (±4%) in diameter. You can check the finger coverage in the simulator below.
Ring:
Skin tone:
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Ring width:
3.0 mm
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Saved...
64 mm
| Your settings | |
|---|---|
Ring |
Gold |
Skin tone |
Light |
Ring diameter |
16.9 mm |
Ring width |
3.0 mm |
Finger length |
64 mm |
Finger coverage |
97 % |
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Saved...
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Ring diameter:
16.9 mm
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Additional Info
Ruby is a red to pink variety of the mineral Corundum. Its name comes from the Latin word "ruber", which simply means "red". Most Rubies on the market are heat-treated to enhance their color and clarity.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Gem Details
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Name:
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Ruby |
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Mineral Group:
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Corundum |
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Shape:
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Round |
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Chemical Formula:
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Al2O3 |
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Crystal Structure:
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Hexagonal |
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Hardness:
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9 |
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Specific Gravity
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4 |
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Carat weight:
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20 ct |
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Gram weight:
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4 g (0.1411 ounces) |
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Points:
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2000 pts |
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Length:
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16.23 mm |
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Width:
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16.23 mm |
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Average diameter:
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16.23 mm |
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Est. face-up size:
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206.88 mm² |
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Volume:
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1000 mm³ |
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Length-to-width ratio:
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1 |
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Refractive Index:
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1.76 - 1.77 |
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Luster:
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Vitreous to adamantine |
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Wearability:
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Excellent |
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Care Instructions:
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No special or unusual care |
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Color:
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Ruby can be found in the following colors:
 
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Birthstone:
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Ruby is a birthstone for the month of July |
Popular comparisons:
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 1.25ct Ruby (Cushion, Red, 6.02 x 6.02)
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 15ct Ruby (Round, Red, 14.74 x 14.74)
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 20ct Diamond (Round, White, 17.64 x 17.64)
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 25ct Ruby (Round, Red, 17.48 x 17.48)
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 4.3ct Ruby (Cushion, Red, 9.09 x 9.09)
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 11.08ct Amethyst (Emerald, Violet, 16.34 x 12.1)
- 20ct Ruby (Round, Red, 16.23 x 16.23) vs. 1ct Emerald (Round, Green, 6.82 x 6.82)