Does anyone recognize signature initials on a pair of clip earrings?

[pheasantvillecollectables519]

I think the earrings are very nice and well made.  Pretty sure the cabochon is ceramic.  Initials of MR sort of run together under the clip - I couldn't find it on  Illusion Jewels althought it may be there, just not under M.

[pheasantvillecollectables519]

Perhaps this is  a clearer photo of the initials:

[pheasantvillecollectables519]

One more try.  I think the cabochon is porcelain but is it possibly glass instead?  I see far more black glass cabochon earrings than porcelain. 

I wouldn't bother trying to get answers except I think these are really nice earrings, fairly large at 1 7/8 by 1 5/8.