I think gold ball stud earrings will definitely work with it.
Or sapphire earrings.
Glad to hear you like yours
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How much did you have it extended and how long did it take? I haven't seen or tried mine yet (going to Paris in August to pick it up), but I have a feeling I might like it better when it's a bit longer.
Did they ship yours after it was extended? I know they don't ship the blue Sèvres pendant, but I wonder how their policy is if you bought it and you would like to have it extended, would they still not ship it?