The word "Bohemian" gets bandied around a lot (by people like me!) and is usually used to refer to a style that is 'characterised by unconvential and artistic detail'.
If you delve into the history books (or Wikipedia) you'll find Bohemia was a historical kingdom in Central Europe, occuping mostly what is now the Czech Republic.
During Victorian times it was fahionable for people of means to adorn their clothes with gemstones, and garnets were at the height of popularity, particularly the Pyrope Garnets found in Bohemia; with their deep red colour (due to their Mg content) and light refraction, they were favoured by kings and queens.
The typical design for that time was for close-set gemstones dominating the setting, with minimal metal showing through. Ref Antique Gold & Jewels
So it is these characteristic clusters of Pyrope Garnets which are indicative of authentic Bohmeian Jewellery.
Which means.. if you want some genuine boho action you should get yourself something like these!
That pair of earrings at the top are my favourites!
Garnet come in a few different colours..
The Pyrope garnets mentioned above owe their red colour to the Magnesium content.
Aldmandine garnets are the iron rich member and usually have a violet tint to their red hue.
Spessartite is coloured by Manganese and are a characterisitc orange to organge red.
Grossular Garnets range in colour from green to yellow to brown and have Calcium in their chemical compositon.