Boulder opal is a great volition to the other two main types of opal Black opal and White opal. Boulder opal is substantially vended in opal shops as a free form piece of rock . That means that the gravestone has its own individual shape rather than an round or a circle or a pear shape which black and white opals are typically cut into.
A free form shape won't look like any shape that you fete but will still be pleasing. Another major difference is that boulder opal will frequently not be smooth and domed on the top. We call this a baguette from an old French word which translates to the English word chapeau. We cut most opals into gemstones because it enhances their color characteristics by allowing the light to enter and exit the gravestone for maximum effect.
Black opal rings will substantially have an undulating face of the opal material sitting on a bed or dark brown ironstone. This means that the gravestone will need to have a jeweler make a special setting for the gravestone because ready made settings or castings generally come in round shapes which are made for baguette cuts of monuments and not free form monuments.
There are two sub types of boulder opal confluence and matrix. Confluence opal is set up where the opal material invades cracks in the ironstone gemstone. When the ironstone boulder is broken piecemeal of by running a bulldozer across it or hitting it with a big hammer the gemstone will resolve into two corridor. The opal will be in each part.
Matrix opal is where the opal runs in an erratic fashion throughout the gemstone. So the factual gravestone is cut and polished with the opal matrix within it. It makes great opal pendants.
Fire opal ring is heavier than black opal or white opal because it frequently has the ironstone with it so it makes it a little more delicate to make into some kinds of opal jewelry similar to an opal ring or opal earrings. clearly not insolvable to make into anything but for pendants
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