These bracelets are around 9-10mm.
Commonly described as the gem Morganite, these bracelets are in fact called Beryl as they contain various crystals which make up the Beryl family.
The family consisting of Aquamarine (blue), Morganite (peachy pink), Heliodor (yellow), Goshenite (clear white) and Emerald (green) are often combined to make the ‘Morganite’ bracelet.