What pearl luster is, what causes it, how to judge it in seconds, how it varies by pearl type, and why it matters more than size or shape when you buy.

How black and white pearls really differ: the oysters behind each, why black pearls are dark, a side-by-side comparison, and which one to choose.

How Akoya pearls are priced by quality: the factors that matter, where the size premium kicks in, and how Akoya compares with South Sea and Tahitian on cost.

The truth about the hot water test for pearls, why it can damage real nacre, and the simple at-home tests that actually tell a real pearl from a fake.