Topaz (18.40 Carat )
14.79 x 14.79 mm
Stone Type : | Topaz |
Stone Shape : | Princess |
Stone Weight : | 18.40 carat |
Length X Width : | 14.79 x 14.79 mm |
Length / Width Ratio : | 1.00 |
Approx Face-up Area : | 218.67 mm² |
Approx Volume : | 1,042.50 mm³ |
How many Colors Available for Topaz ?
White , Light Red , Red , Dark Red , Orangey Red , Light Orange , Orange , Light Brown , Brown , Dark Brown , Light Yellow , Yellow , Light Yellowish Green , Yellowish Green , Dark Yellowish Green , Light Green , Green , Dark Green , Light Bluish Green , Bluish Green , Dark Bluish Green , Light Blue , Blue , Dark Blue , Light Violet , Violet , Dark Violet , Light Purple , Purple , Dark Purple , Light Grey , Grey ,
Topaz is a gemstone of many colors. It’s commonly found colorless (white) and then treated to achieve desired colors. Blue Topaz is the most common and popular color variety.
Name of Stone : | Topaz |
Mineral : | Topaz |
Shape : | Princess |
Chemical Formula : | Al2SiO4(F,OH)2 |
Crystal Structure : | Orthorhombic |
Hardness : | 8 |
Specific Gravity : | 3.53 |
Carat weight : | 18.40 carat |
Gram weight : | 3.680 gm |
Ounces weight : | 0.1298 ounces |
Length : | 14.79 mm |
Width : | 14.79 mm |
Length / Width Ratio : | 1.00 |
Average diameter : | 14.79 mm |
Approx Face-up Area : | 218.67 mm² |
Approx Volume : | 1,042.50 mm³ |
Refractive Index : | 1.610 - 1.638 |
Cleavage : | 1,3 - basal |
Luster : | Vitreous |
Birefringence : | 0.014 |
Wearability : | Very good |
Birthstone : | Topaz is a birthstone for the month of December |
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
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1.00 ct - Princess - Topaz
1.50 ct - Princess - Topaz
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14.30 ct - Princess - Topaz
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21.20 ct - Princess - Topaz
24.60 ct - Princess - Topaz
27.10 ct - Princess - Topaz
32.40 ct - Princess - Topaz
36.30 ct - Princess - Topaz
33.80 ct - Princess - Topaz
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27.00 ct - Kyanite - Cushion
28.70 ct - Kyanite - Marquise
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36.70 ct - Citrine - Marquise
33.20 ct - Emerald - Marquise
35.50 ct - Hiddenite - Marquise
30.60 ct - Diaspore - Marquise
36.20 ct - Diaspore - Trillion
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V S
8.10 ct - Alexandrite - Trillion
5.70 ct - Kunzite - Princess
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1.50 ct - Citrine - Round
7.30 ct - Ruby - Cushion
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0.90 ct - Kyanite - Cushion
10.60 ct - Hiddenite - Round
V S
17.10 ct - Spinel - Oval
16.40 ct - Diopside - Emerald
V S
17.40 ct - Tanzanite - Pear
15.70 ct - Aquamarine - Marquise
V S
19.20 ct - Citrine - Trillion
22.60 ct - Diamond - Princess
V S
23.80 ct - Diaspore - Emerald
27.00 ct - Kyanite - Cushion
V S
28.70 ct - Kyanite - Marquise
27.20 ct - Diamond - Emerald
V S
28.30 ct - Sinhalite - Oval
36.70 ct - Citrine - Marquise
V S
33.20 ct - Emerald - Marquise
35.50 ct - Hiddenite - Marquise
V S
30.60 ct - Diaspore - Marquise
36.20 ct - Diaspore - Trillion
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35.10 ct - Fluorite - Oval
9.00 ct - Pear- Diamond
5.60 ct - Baguette- Diamond
8.50 ct - Round- Diamond
8.30 ct - Cushion- Diamond
7.60 ct - Baguette- Diamond
5.10 ct - Trillion- Diamond
10.50 ct - Trillion- Diamond
10.70 ct - Pear- Diamond
17.90 ct - Trillion- Diamond
15.10 ct - Cushion- Diamond
18.80 ct - Cushion- Diamond
19.50 ct - Round- Diamond
28.70 ct - Round- Diamond
24.60 ct - Baguette- Diamond
28.90 ct - Round- Diamond
23.60 ct - Marquise- Diamond
25.10 ct - Cushion- Diamond
29.30 ct - Cushion- Diamond
38.10 ct - Marquise- Diamond
37.80 ct - Emerald- Diamond
32.20 ct - Baguette- Diamond
33.00 ct - Pear- Diamond
33.90 ct - Princess- Diamond
39.90 ct - Emerald- Diamond
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8.30 ct - Cushion- Diamond
7.60 ct - Baguette- Diamond
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10.50 ct - Trillion- Diamond
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15.10 ct - Cushion- Diamond
18.80 ct - Cushion- Diamond
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19.50 ct - Round- Diamond
28.70 ct - Round- Diamond
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24.60 ct - Baguette- Diamond
28.90 ct - Round- Diamond
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23.60 ct - Marquise- Diamond
25.10 ct - Cushion- Diamond
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29.30 ct - Cushion- Diamond
38.10 ct - Marquise- Diamond
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37.80 ct - Emerald- Diamond
32.20 ct - Baguette- Diamond
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33.90 ct - Princess- Diamond
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