Blue color zoning observed in some of the unusual rubies; immersed in

Gemmology notes

Coherent long-range magnetic bound states in a superconductor

The unusual color zoning in this colorchange sapphire is typical of

Investigating Fake Rough With Gem Testing Laboratory Jaipur

PDF) Challenging Synthetic Rubies Examined in GIA's Bangkok and Hong Kong Laboratories

Jonathan Muyal's research works

Suspect Blues — Pala international

Sapphire Gem Guide and Properties Chart

Strong blue color zones were observed in many of the Jegdalek rubies.

PDF) Challenging Synthetic Rubies Examined in GIA's Bangkok and Hong Kong Laboratories

Corundum Value, Price, and Jewelry Information

InVogueJewelry: Emeralds, Rubies and Sapphires from India are FAKE: Really DYED SILLIMANITE!