The British Museum has put the essays in the book, Intelligible Beauty, on line for free download here. I blogged about it previously here and here.
If you are interested in Byzantine jewelry, this is a great source for essays reflecting the latest research, complete with clear, full-color photographs of surviving examples. It almost makes me regret having bought my dead-tree copy, even though I got it at a greatly discounted price. Thanks to Katherine of Yahoo's 12thcenturygarb list for the pointer.