Ruby (Lead-glass filled) | Gemopedia

Lead glass filled rubies have been filled through a process similar to "infilling" using lead glass. Performed at lower temperatures, this is a less durable treatment and should be treated gently, avoiding household and professional chemicals. This treatment improves clarity, color, durability, and may add weight through the filling of voids and fissures.
Alternate
Names
Mahaleo Ruby
Colors
Orangy Red, Red, Purplish Red

Ruby (Lead-glass filled) Classification

Common Name

Ruby (Lead-glass filled)

Species

Corundum

Variety

Lead Glass Filled Rubies

Colors

Orangy Red, Red, Purplish Red

Alternate Names

Mahaleo Ruby

Gemstone Groups

Key Separations

Magnification and RI, birefringence, pleochroism

Comments

Lead glass will be damaged with jeweler's torch or exposure to chemicals. Specific gravity can be increased to to the amount of lead glass in the stone.

Ruby (Lead-glass filled) Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.762-1.77
Tolerance:(+0.009/-0.005)

Birefringence

0.008-0.01

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Dichroic, strong orangy red and purplish red

Dispersion

Strength: moderate fire Value: 0.018

Comments

Ruby (Lead-glass filled) Chemistry & Crystallography

Chemical Name

aluminum oxide

Chemical Formula

Al2O3

Synthesis

Crystal System

Trigonal

Classification

Oxide

Nature

Natural

Crystallinity

Crystalline

Comments

Ruby (Lead-glass filled) Characteristic Physical Properties

Hardness

9

Streak

White

Specific Gravity

3.95-4.1 Typical:4

Toughness

Poor

Inclusions

Lead glass filled rubies will show gas bubble sand color concentrations in fissures. Blue flash colors from the lead glass filling might be seen when viewing stone in dark field lighting.

Luster

SubAdamantine

Stability

Poor

Fracture

Conchoidal

Cleavage

None

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