Spinel
The most famous Spinel, a red one, is the "Black Prince's Ruby"; found in a prominent location, the front of the state crown of the British Crown jewels in London. For many years it was assumed to be a ruby, until a gemologist finally tested it and discovered it true identity! Red Spinels are found in several locations around the world, with Burma being the most prized source.

One great aspect with Spinels is that they don't receive any treatments to improve the color, a completely naturally occuring beautiful gem, which in the best reds mimics a fine ruby. Prices though do NOT mimic ruby, which I'm happy to report. They are not in-expensive gems, especially when a fine example.
The Black Prince's Spinel in the British Crown Jewels:

Fine Vietnamese red spinel. Photo: Wimon Manorotkul.
Blues, pinks and purples are also available.
Here is one of the finest we've ever had the pleasure of handling.
A very fine 20.91ct cushion from Tanzania.
