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Opals are fascinating and beautiful stones, but it can confusing shopping for them. What is the difference in Tiffany Jewellery between boulder, doublets, and triplets? Is the milky light stone more valuable then the dark green? What colors should I look for? Here are a few tips when choosing opal:
Australian opal is generally the best and where most of the worlds opal supply comes from. This is a good place to start and worth asking. Boulder, or solid, opal is the rarest or most expensive. Sometimes called black opal, you can tell its boulder opal because it will be a solid stone without a backing. You may have to ask if the stone is set. Do a 360 test. You want the color saturation to be strong from every angle you look at it. Look for warm colors. The higher quality opal has reds and yellows that appear to be underneath the surface, giving the stone depth. Do a 360 test and look for reds and yellows. Personal preference. The shades of green and blue matter more on personal preference and don't affect value as much. Doublets have a line down the center where the opal is glued to another material, but if the stone is set you may have to ask if its a doublet or boulder. These are less expensive then boulder and use less opal, but are a fine option for your collection. Most opal you see in fine opal jewelry will be doublets. Triplets are doublets with a piece of clear material over the top of the opal. The least expensive option. Use a reputable jeweler. This is definitely a case where you want to buy from someone you trust.