Alexandrite (18.20 Carat )
20.43 x 13.63 mm
Stone Type : | Alexandrite |
Stone Shape : | Oval |
Stone Weight : | 18.20 carat |
Length X Width : | 20.43 x 13.63 mm |
Length / Width Ratio : | 1.50 |
Approx Face-up Area : | 228.23 mm² |
Approx Volume : | 983.68 mm³ |
How many Colors Available for Alexandrite ?
Red , Dark Red , Light Brown , Brown , Dark Brown , Light Yellowish Green , Yellowish Green , Dark Yellowish Green , Light Green , Green , Dark Green , Light Bluish Green , Bluish Green , Dark Bluish Green , Light Violet , Violet , Dark Violet , Light Purple , Purple , Dark Purple ,
Named after Czar Alexander II (1818–1881) Alexandrite is a rare and valuable color-change variety of chrysoberyl. Alexandrite possesses a surprising ability to change color - from green or bluish-green in daylight, it transforms to purplish or raspberry red in incandescent light.
Name of Stone : | Alexandrite |
Mineral : | Chrysoberyl |
Shape : | Oval |
Chemical Formula : | BeAl2O4 |
Crystal Structure : | Orthorhombic |
Hardness : | 8.5 |
Specific Gravity : | 3.7 |
Carat weight : | 18.20 carat |
Gram weight : | 3.640 gm |
Ounces weight : | 0.1284 ounces |
Length : | 20.43 mm |
Width : | 13.63 mm |
Length / Width Ratio : | 1.50 |
Average diameter : | 17.03 mm |
Approx Face-up Area : | 228.23 mm² |
Approx Volume : | 983.68 mm³ |
Refractive Index : | 1.744 - 1.755 |
Cleavage : | 1,1 ; 3,2 |
Luster : | Vitreous |
Birefringence : | 0.009 |
Wearability : | Durable gem for daily wear |
Birthstone : | Alexandrite is a birthstone for the month of June |
Before purchasing a diamond, one should make sure it looks its weight. It's important to understand that carat weight does not equal face-up size.
Two diamonds of exactly the same weight (and shape) can vary quite considerably in face-up size. This depends on the proportions of the cut (e.g., deep cuts will face up smaller)..
Face-up area is a measure of the size of the diamond when viewed from the top view.
It tells you how big the diamond is at the girdle plane. It's important for a diamond to have sufficient face-up size for its carat weight
Diamond prices vary greatly as they depend on the combination of unique characteristics (4Cs - Cut, Color, Clarity, and Carat). For best value, it's important to choose the combination that will reduce the price without having a negative impact on appearance.
You also need to consider some of the following points as well
- Strong blue fluorescence.
- Fair or Poor symmetry.
- Extremely thin or extremely thick girdle.
- Inclusions visible to the naked eye.
- Diamond Certification.
Blue fluorescence can have a positive, negative, or zero effect on a diamond. Diamonds in the lower color range (H or lower) can benefit from it, as it can make them look whiter, more colorless. On the other hand, strong fluorescence can cause a stone (especially in the higher color range D-G) to appear hazy or milky under certain light conditions. One of the biggest benefits of fluorescent diamonds is that they generally cost less.
Blue fluorescence can be found in 35% of naturally mined diamonds and it makes the stone glow under UV light. Outside of UV lighting environments, there are no visual differences between fluorescent and non-fluorescent diamonds.
However, there exists a big difference in pricing between these diamonds. In the industry, diamonds with fluorescence are usually traded at a 10-15% discount and can go as high as 25% for higher colored diamonds.
GIA grades fluorescence as None, Faint, Medium, Strong, and Very Strong.
There are Many Laboratory Available which provides certification for Gemstones.
- GIA - Gemological Institute of America
- AGS - American Gemological Society
- HRD - The Hoge Raad voor Diamant
- IGI - International Gemological Institute
- EGL - European Gemological Laboratories
- GSI - Gemological Science International
*Different certification labs give different results
Piecut Diamonds are set of small Diamonds, which are cut & polished with Precised Measurements to look like a Single Solitaire diamond which can save 80% to 85% from Solitaire Single Piece Price.
Shapes of Pie Cut Diamonds.
- 9 Pcs Emerald
- 9 Pcs Round
- 4 Pcs Round
- 3 Pcs Heart
- 4 Pcs Oval
- 4 Pcs Pear
- 4 Pcs Marquise
- 5 Pcs Star
Click here for More Information
2.70 ct - Oval - Alexandrite
5.60 ct - Oval - Alexandrite
5.10 ct - Oval - Alexandrite
12.70 ct - Oval - Alexandrite
17.20 ct - Oval - Alexandrite
17.40 ct - Oval - Alexandrite
21.00 ct - Oval - Alexandrite
27.80 ct - Oval - Alexandrite
24.20 ct - Oval - Alexandrite
32.10 ct - Oval - Alexandrite
35.70 ct - Oval - Alexandrite
35.50 ct - Oval - Alexandrite
5.60 ct - Oval - Alexandrite
5.10 ct - Oval - Alexandrite
12.70 ct - Oval - Alexandrite
17.20 ct - Oval - Alexandrite
17.40 ct - Oval - Alexandrite
21.00 ct - Oval - Alexandrite
27.80 ct - Oval - Alexandrite
24.20 ct - Oval - Alexandrite
32.10 ct - Oval - Alexandrite
35.70 ct - Oval - Alexandrite
35.50 ct - Oval - Alexandrite
6.20 ct - Amethyst - Round
2.70 ct - Morganite - Emerald
5.80 ct - Chrysoberyl - Trillion
8.70 ct - Kyanite - Princess
5.30 ct - Sinhalite - Marquise
8.40 ct - Beryl - Baguette
18.10 ct - Diopside - Cushion
18.30 ct - Benitoite - Princess
15.00 ct - Diopside - Marquise
10.10 ct - Apatite - Princess
13.80 ct - Fluorite - Baguette
12.20 ct - Apatite - Round
23.10 ct - Andesine - Oval
29.40 ct - Morganite - Oval
22.80 ct - Beryl - Emerald
28.00 ct - Emerald - Oval
24.90 ct - Amethyst - Marquise
29.10 ct - Spinel - Cushion
32.20 ct - Beryl - Marquise
40.00 ct - Hiddenite - Oval
35.50 ct - Quartz - Pear
40.00 ct - Benitoite - Princess
30.60 ct - Diaspore - Round
39.50 ct - Sapphire - Trillion
V S
2.70 ct - Morganite - Emerald
5.80 ct - Chrysoberyl - Trillion
V S
8.70 ct - Kyanite - Princess
5.30 ct - Sinhalite - Marquise
V S
8.40 ct - Beryl - Baguette
18.10 ct - Diopside - Cushion
V S
18.30 ct - Benitoite - Princess
15.00 ct - Diopside - Marquise
V S
10.10 ct - Apatite - Princess
13.80 ct - Fluorite - Baguette
V S
12.20 ct - Apatite - Round
23.10 ct - Andesine - Oval
V S
29.40 ct - Morganite - Oval
22.80 ct - Beryl - Emerald
V S
28.00 ct - Emerald - Oval
24.90 ct - Amethyst - Marquise
V S
29.10 ct - Spinel - Cushion
32.20 ct - Beryl - Marquise
V S
40.00 ct - Hiddenite - Oval
35.50 ct - Quartz - Pear
V S
40.00 ct - Benitoite - Princess
30.60 ct - Diaspore - Round
V S
39.50 ct - Sapphire - Trillion
6.30 ct - Round- Diamond
4.40 ct - Oval- Diamond
3.30 ct - Princess- Diamond
1.60 ct - Oval- Diamond
9.30 ct - Oval- Diamond
2.40 ct - Princess- Diamond
10.70 ct - Oval- Diamond
19.30 ct - Marquise- Diamond
10.20 ct - Round- Diamond
13.90 ct - Round- Diamond
17.70 ct - Baguette- Diamond
16.70 ct - Pear- Diamond
28.40 ct - Emerald- Diamond
27.50 ct - Emerald- Diamond
27.60 ct - Princess- Diamond
20.30 ct - Cushion- Diamond
21.10 ct - Cushion- Diamond
27.00 ct - Oval- Diamond
31.70 ct - Oval- Diamond
35.70 ct - Emerald- Diamond
33.20 ct - Baguette- Diamond
32.40 ct - Emerald- Diamond
36.30 ct - Baguette- Diamond
35.00 ct - Round- Diamond
V S
4.40 ct - Oval- Diamond
3.30 ct - Princess- Diamond
V S
1.60 ct - Oval- Diamond
9.30 ct - Oval- Diamond
V S
2.40 ct - Princess- Diamond
10.70 ct - Oval- Diamond
V S
19.30 ct - Marquise- Diamond
10.20 ct - Round- Diamond
V S
13.90 ct - Round- Diamond
17.70 ct - Baguette- Diamond
V S
16.70 ct - Pear- Diamond
28.40 ct - Emerald- Diamond
V S
27.50 ct - Emerald- Diamond
27.60 ct - Princess- Diamond
V S
20.30 ct - Cushion- Diamond
21.10 ct - Cushion- Diamond
V S
27.00 ct - Oval- Diamond
31.70 ct - Oval- Diamond
V S
35.70 ct - Emerald- Diamond
33.20 ct - Baguette- Diamond
V S
32.40 ct - Emerald- Diamond
36.30 ct - Baguette- Diamond
V S
35.00 ct - Round- Diamond