4.5 Carat Ruby (Round, 9.87mm, Red)
Color:
Actual size is set for screen
How big is a 4.5 carat round-cut Ruby?
It depends on the cut proportions, but typically a 4.5ct round-cut Ruby would measure around 9.87 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 |
59 % |
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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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4.5 ct |
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Gram weight:
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0.9 g (0.0317 ounces) |
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Points:
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450 pts |
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Length:
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9.87 mm |
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Width:
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9.87 mm |
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Average diameter:
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9.87 mm |
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Est. face-up size:
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76.51 mm² |
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Volume:
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225 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:
- 4.5ct Ruby (Round, Red, 9.87 x 9.87) vs. 4.5ct Diamond (Round, White, 10.73 x 10.73)
- 4.5ct Ruby (Round, Red, 9.87 x 9.87) vs. 3.75ct Sapphire (Round, Blue, 9.29 x 9.29)
- 4.5ct Ruby (Round, Red, 9.87 x 9.87) vs. 2.75ct Diamond (Oval, White, 11.37 x 7.58)
- 4.5ct Ruby (Round, Red, 9.87 x 9.87) vs. 3ct Quartz (Round, Orangey Red, 9.89 x 9.89)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 3ct Ruby (Round, Red, 8.62 x 8.62) vs. 5ct Ruby (Round, Red, 10.22 x 10.22)
- 0.5ct Ruby (Round, Red, 4.75 x 4.75) vs. 0.5ct Emerald (Round, Green, 5.41 x 5.41)
- 1ct Ruby (Round, Red, 5.98 x 5.98) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)