Major gemological laboratories in the world have independently tested gold sheen sapphire, and reached similar conditions as a natural unique variety of corundum. These include some of the most prestigious gemological laboratories and the most respected in the world like, 1. Gemological Institute of America 2. Gem and Jewelry Institute of Thailand 3. Lotus Gemology 4. Gem Research Swiss lab 5. The Asian Gem Laboratory 6. Asian Institute of Gemological Sciences 7. Tokyo Gem Labs 8. International colored gemstone association And more. Click here to read more