Below are three close-ups of the earrings.
Luckily, Anna from the facebook page My Small Obsessions shared a replikate pair she bought on Novica.com. They are by far the best pair of replikates of these earrings I have seen so far, so a few weeks ago I ordered a pair for myself. Here they are:
The replikate earrings are called 'Arctic tear', and are made of tear shaped blue topaz stones in a setting of .925 sterling silver and clear cubic zirconias. They are approximately 1" x 0.4" (2.5 x 1 cm) and handcrafted by an artisan named Bhavesh, who lives in Jaipur, India. And although the earrings are send directly from India, the package arrived within a week! (It was send via FedEx).
Looking at the close-ups of Kate I believe the earrings from Novica are slightly bigger, and maybe a bit darker blue, but as I said, they are still the best pair of replikates I've seen so far. After wearing them for a few times I think they are of good quality and definitely worth the $54.99.