18.50 Ct Pear Diamond     VS     19.20 Ct Oval Diamond

Diamond

Pear

18.50 Carat
23.92 x 14.41 mm

Diamond

Oval

19.20 Carat
21.74 x 14.49 mm
Stone Type
Diamond Diamond
Stone Shape
Pear Oval
Stone Weight
18.50 carat 19.20 carat
Length X Width
23.92 x 14.41 mm 21.74 x 14.49 mm
Length / Width Ratio
1.66 1.50
Approx Face-up Area
251.62 mm² 258.31 mm²
Approx Volume
1,051.14 mm³ 1,090.91 mm³
Mineral
Diamond Diamond
Chemical Formula
C C
Crystal Structure
Isometric Isometric
Hardness
10 10
Specific Gravity
3.52 3.52
Gram weight
3.700 gm 3.840 gm
Ounces weight
0.1305 ounces 0.1355 ounces
Refractive Index
2.417 - 2.419 2.417 - 2.419
Cleavage
1 1
Luster
Adamantine Adamantine
Birefringence
None None
Wearability
Excellent Excellent
Birthstone
Diamond is a birthstone for the month of April Diamond is a birthstone for the month of April

Diamond Guidelines 4Cs and More

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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