Is this 6.62ct ruby composite? Or glass filled?

I bought this in an auction discription:

“Elegant 5.52ct blood red unheated Winza, Tanzania. Unheated Ruby

The low profile shape of this ruby gives it a standout silhouette giving it a much larger visual presence! Add to that its rich blood red hue and liquid luster, and you have a gorgeous gem that is ready to enhance any setting. It has great size, measuring 13.1mm x 9.9mm x 4.8mm, and a Mohs hardness rating of 9 out of 10 making it as durable as it is beautiful. Sourced from Winza, Tanzania. Unheated!”

CAN YOU TELL ME IF THIS IS A REAL RUBY NOT COMPOSITE OR LEAD GLASS FILLED? I DON’T SEE BUBBLES. THE RUBY DOES TURN A BRIGHT PINK RED UNDER BLACK LIGHT. THX!