Unfortunately no free samples!!
Carat - the seeds of the carob tree were used to determine the weight of gemstones on the scales.
These seeds have a very stable weight of 0.2 grams.
In Greek, this kind of seed is called "keration" (in Arabic "kharrub").
The word carat is derived from this.
Various stages in the processing of a rough diamond into a round one.
Manufacture of cast rings.
A model is made of silver, then a rubber mould of it is made in a casting container.
Liquid wax is injected into the mould making a wax model.
A plaster mould is made of the casting tree then heated so the wax evaporates.
Gold is then poured into the mould and polished ready for the stone to be inserted.
An old diamond cutting machine.
The four C's =Carat, Colour, Cut and Clarity.
The larger the diamond, the finer the colour.