Which source became notable for producing good- to fine-quality sapphires in the late 1990s?

The notable source for producing good- to fine-quality sapphires in the late 1990s is Madagascar. During this time, Madagascar emerged as a significant player in the sapphire market, gaining recognition for the high quality and vibrant colors of its sapphires. The country’s geology, particularly in certain regions, allowed for the formation of sapphires with excellent clarity and saturation, appealing to both jewelers and collectors alike.

Madagascar's sapphires are particularly renowned for their range of colors, including rich blues, yellows, and pinks, many of which are natural, untreated stones. This factor contributed to the country's reputation and helped to solidify its position in the global gemstone market. The discovery and mining of these gemstones opened up new avenues for sourcing and brought about a broader recognition of sapphires from Madagascar as being on par with, or even superior to, those from traditional sources.

In contrast, the other locations mentioned have either been historical sources or have produced sapphires with varying qualities. While Burma has a longstanding reputation for its sapphires, Madagascar's rise in the late 1990s distinctly changed perceptions and options in the sapphire market.