You've reached the hard lower limit of size in SL which is 1cmx1cmx1cm. If you want the link to look right it needs to be part of a larger mesh so either link it to the rest of the necklace and use a material face if you want to have a different texture on it, or

...build a square bounding box around it in edit mode and use a different material face there to make the bounding box invisible.

Also the face normals on the link that goes around the ribbon appear to be inverted which will cause you issues in world as well

What Siddean said! To expand, let's say this is the tiny thing I want to upload to SL, but it's so thin and tiny. As shown by the bounding box

So a quick trick is to add a little triangle just further a bit, just to expand the bounding box:

Joined, the bounding box enlarged. Just remember to give that tiny triangle it's own material so that you can set it to transparent inworld.

Thanks so much for the help guys!! You are amazing ZeeZuleicca and SLinkbySiddean Also I knew the normals were inverted I'd accidentally done that just was too lazy to change it back for the pictures. Again though thanks for all your help

you can also make that triangle into a line, by placing 2 of the points in the exact same spot (snap to or scale to 0), and as long as you do NOT remove doubles and it remains a secret triangle, it will still cheat up your bounding box- and with the "line" it will always be invisible, no separate material required.

Allegory: omg GENIUS!!! I'm going to do that next time!

^^^