2.5 Carat Ruby (Cabochon, 9.29×6.19mm, Red)
Color:
Actual size is set for screen
How big is a 2.5 carat cabochon-cut Ruby?
It depends on the cut parameters and length-to-width ratio, but a typical size of a 2.5ct cabochon-cut Ruby would be around 9.29×6.19 mm (±6%). The lw ratio of this Ruby is 1.5. See below how big it looks on a ring and finger.
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 |
37 % |
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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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Cabochon |
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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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2.5 ct |
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Gram weight:
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0.5 g (0.0176 ounces) |
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Points:
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250 pts |
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Length:
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9.29 mm |
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Width:
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6.19 mm |
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Est. face-up size:
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47.15 mm² |
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Volume:
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125 mm³ |
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Length-to-width ratio:
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1.5 |
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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:
- 3ct Ruby (Cabochon, Red, 9.87 x 6.58) vs. 5ct Ruby (Oval, Red, 12.93 x 8.62)
- 1.3ct Ruby (Cabochon, Red, 7.47 x 4.98) vs. 0.13ct Diamond (Round, White, 3.29 x 3.29)
- 10ct Ruby (Cabochon, Red, 14.75 x 9.83) vs. 10ct Emerald (Cabochon, Dark Yellowish Green, 16.82 x 11.21)
- 5ct Ruby (Cabochon, Red, 11.7 x 7.8) vs. 5ct Diamond (Cabochon, White, 12.21 x 8.14)
- 4ct Ruby (Cabochon, Red, 10.86 x 7.24) vs. 8.16ct Emerald (Oval, Green, 17.36 x 11.57)
- 1ct Ruby (Cabochon, Red, 6.84 x 4.56) vs. 0.65ct Emerald (Cabochon, Green, 6.77 x 4.51)
- 10ct Ruby (Cabochon, Red, 14.75 x 9.83) vs. 1ct Ruby (Oval, Red, 7.56 x 5.04)
- 4ct Ruby (Cabochon, Red, 10.86 x 7.24) vs. 2.75ct Diamond (Oval, White, 11.37 x 7.58)