40 Carat Ruby (Round, 20.45mm, Red)
Color:
Actual size is set for screen
How big is a 40 carat round-cut Ruby?
It depends on the cut proportions, but typically a 40ct round-cut Ruby would measure around 20.45 mm (±4%) in diameter. You can check the finger coverage in the simulator below.
Ring:
Skin tone:
|
Ring width:
3.0 mm
|
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 |
122 % |
|
Saved...
|
|
|
Ring diameter:
16.9 mm
|
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
|
Name:
|
Ruby |
|
Mineral Group:
|
Corundum |
|
Shape:
|
Round |
|
Chemical Formula:
|
Al2O3 |
|
Crystal Structure:
|
Hexagonal |
|
Hardness:
|
9 |
|
Specific Gravity
|
4 |
|
Carat weight:
|
40 ct |
|
Gram weight:
|
8 g (0.2822 ounces) |
|
Points:
|
4000 pts |
|
Length:
|
20.45 mm |
|
Width:
|
20.45 mm |
|
Average diameter:
|
20.45 mm |
|
Est. face-up size:
|
328.46 mm² |
|
Volume:
|
2000 mm³ |
|
Length-to-width ratio:
|
1 |
|
Refractive Index:
|
1.76 - 1.77 |
|
Luster:
|
Vitreous to adamantine |
|
Wearability:
|
Excellent |
|
Care Instructions:
|
No special or unusual care |
|
Color:
|
Ruby can be found in the following colors:
 
|
|
Birthstone:
|
Ruby is a birthstone for the month of July |
Popular comparisons:
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 0.05ct Ruby (Round, Red, 2.2 x 2.2)
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 40ct Amethyst (Round, Violet, 23.45 x 23.45)
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 31ct Diamond (Round, White, 20.42 x 20.42)
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 40ct Emerald (Emerald, Green, 24.89 x 18.44)
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 31.2ct Diamond (Round, White, 20.46 x 20.46)
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 40ct Emerald (Round, Green, 23.31 x 23.31)
- 40ct Ruby (Round, Red, 20.45 x 20.45) vs. 20ct Emerald (Emerald, Green, 19.76 x 14.64)