Bloulder are very thin and small. So the correct term for a "boulder opal" is an opal that has been created in the crevices of a opal. Bloulder are mainly found in Queensland, Australia.
[Bloulder].
Chemical name: hydrated silica
Chemical Classification: Silicate
Color: brown, multicolor
Hardness: 5-6.5
Specific gravity: 1.980-2.250
Luster: glassy - resinous
Fracture: shell-shaped, uneven
Transparency: transparent - opaque
Refractive index: 1.420-1.430
Place of origin: Australia, Mexico, Brazil, Canada, etc.
❄️ [Classification]
Due to the different shapes and sizes of the surrounding rocks and the indeterminate nature of the crevices that allow the growth of the Opal, the form of the Bloulder is very complex and varied. According to the form of growth of Bloulder in the parent rock, it can be divided into Seam, pipe and Matrix
[Value of Bloulder]
①Color change effect
Variegated color effect is the most important factor affecting the value of the Opal, mainly from the color, spot size, covering an area of three aspects.
a. Variegated color spot color according to red, orange, yellow, green its value is gradually reduced, the color requirements of bright, bright, at the same time high-quality opal should cover as many colors.
b. Variegated color spot the larger the corresponding opal value is higher.
c. Variegated color effect should cover the entire opal, the more dead ends appear, the lower the value.
② clarity
Surface clean, there should be no obvious cracks, cracks will not only affect the clarity of the opal, but also on the durability of a certain impact.
③Weight and shape
The larger and thicker the opal layer, the higher the value of the Bloulder with surrounding rocks. In order to ensure maximum color variation, Bloulder are usually faceted according to their prototype, with symmetrical facets commanding a higher price, and artistic facets increasing their value accordingly.
[Preservation].
It needs normal gentle care. Keep it away from heat and fumes, and keep it in a clean environment when you don't want to wear it.
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