Diamond (HPHT-treated) | Gemopedia

HPHT is an acronym for a process using High Pressure and High Temperatures. In this high-tech treatment technique, diamonds are subjected to extremely high temperatures and high pressures using similar equipment to that in which diamonds are synthesized. The heat and pressure simulate conditions during a diamond's formation deep in the Earth, and can cause alterations in the diamond's crystal structure and resulting appearance, thereby improving or altering a diamonds color.
Colors
Strongly Yellowish Green, Greenish Yellow, Yellow, Brownish Yellow, Colorless

Diamond (HPHT-treated) Classification

Common Name

Diamond (HPHT-treated)

Species

Diamond

Variety

HPHT-Treated Diamond

Colors

Strongly Yellowish Green, Greenish Yellow, Yellow, Brownish Yellow, Colorless

Alternate Names

Gemstone Groups

Key Separations

polish luster, OTL RI, SR nature, magnification, positive reaction to diamond tester, advanced lab testing

Comments

Produced by treating brown nitrogen containing Type Ia diamonds.

Diamond (HPHT-treated) Optical Properties

Transparency

Transparent - Translucent

Refractive Index

2.417-0

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

None

Dispersion

Strength: moderate fire Value: 0.044

Comments

Diamond (HPHT-treated) Chemistry & Crystallography

Chemical Name

carbon

Chemical Formula

C

Synthesis

Crystal System

Cubic

Classification

Native Element

Nature

Natural

Crystallinity

Crystalline

Comments

Diamond (HPHT-treated) Characteristic Physical Properties

Hardness

10

Streak

Specific Gravity

3.51-3.53 Typical:3.52

Toughness

Good

Inclusions

Etched or pitted naturals or feathers, tension fractures sometimes containing graphite around crystalline inclusions.

Luster

Adamantine

Stability

Excellent

Fracture

Uneven

Cleavage

Perfect, in four directions

Comments

JTV on Google+
0 Items
My Wish List
Close
Item
Description
Qty.
Price


Estimated Order Total:
0
Total Due Today:
0
Close
Item
Description
Qty.
Price


Page of 1