Is this reputable certifier for a Yogo Sapphire??

[ZoeKids]

Has anyone heard of this organization to certify the authenticity of a Yogo Sapphire?

http://www.gemstoneindex.com/

The Yogo stone we purchase, which we can send back if it doesn''t meet our standards, came with a certificate from this organization. However, we purchased it from

http://www.sapphire-untreated.com/index.htm

And, you know what .... both companies have the same phone number. It feels a little like nepotsim.

Mary