Back to Top Stone's Coloured Gem stones There are so many variations and types of Gem stones each with their own characteristics and propertys that it in near impossible to cover all here, However I have listed some of the more popular ones and their properties here. With so many imitation Diamonds in the market place today it is very important to be familiar with the latest types. Mossanite seems to be the next and biggest challange to the jeweller. With a specific gravity equaling that of a diamond and a hardness above, it is near impossible to the tell the diffrence. Mossanites reflective index is above that of Diamond, However there is some double refraction when viewed, with a green tinge at the edges.
Diamonds range in price depending on quality.
A 10 point stone is approx. 3mm in diamater. A 25 point stone is approx. The per point price of a stone increases as the stone point size increases. N.B. Diamonds are priced by point weight not diamater.