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Opal Doublet

More than any other gem, each opal is distinctly an individual. No other stone has as rich and varied a folklore. Opals are also the most delicate gems commonly worn. They require special care to insure their health and longevity.

Opal's fire was long thought to be the result of iridescence. However, with the advent of scanning electron microscopes, we now know that it is a result of diffraction.

Opal is relatively soft, with a rating of 5.5-6.5 on the Mohs Scale. Despite its frequent use in rings, opal is a poor choice for a ring stone; it is much better suited to earrings, pins, and pendants.

Major suppliers include Australia, Brazil, Mexico, and the US. Values are normally determined by the presence and nature of color flashes.

An opal doublet consists of a slice of opal glued to a black backing, designed to imitate the appearance of a solid black opal. Adhering the slice of opal to a black backing causes the colour to become much darker and more vibrant. Opal doublets are highly regarded as an inexpensive alternative to solid opals which are very expensive in larger sizes.
Certified Customer Reviews
Overall Rating -> 10 star ratings
Huge selection of gemstones. This is my go to site for gems that aren't available through online retailers like Rio or Stuller. Perfect for custom and one of a kind pieces.
Posted By Erica in September, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
Completely would recommend this company to any gem collector, jewelry store, or someone looking for a gemstone to repair their jewelry. There is an abundance of choices at great prices! If you dona't see what you need exactly the customer service department will go above and beyond to meet your needs. Shipping is very reasonable! The gemstones always arrive well before the expected arrival date. This company has very high standards of meeting their customers needs! They are the number 1 company I go to when looking for any gemstone. They are also very detailed in their descriptions so there is no confusion at all as what you are purchasing! Highly recommended!!!!
Posted By Cliff in July, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
I was just talking to the person that does beading yesterday and she was telling me about black opal beads and I opened your site and there they were.How wonderful.She will make the necklace for me.
Posted By Shorty in September, 2021
Source: Bizrate
Overall Rating -> 9 star ratings
Site was recommended to me by my gemology professor. Based on what I’ve seen gemselect offers good quality stones for a large range of prices
Posted By Lynn in April, 2021
Source: Bizrate
Overall Rating -> 8 star ratings
If I knew I could get beautiful legit gems this easy, I’d have done it a long time ago. Skyrim for real.
Posted By DragonBorn in August, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
Honestly just an all around good experience. I've never had trouble with the service, the price is right, and the selection is extensive.
Posted By DonnieDarko in February, 2021
Source: Bizrate
Overall Rating -> 9 star ratings
I was looking for a gemstone called Sphene/Titanite and found it on GemSelect. They had many gems to choose from and had good prices. I received my order a little later than expected but given that it's coming from overseas I wasn't too worried. The 2 gems I received are beautiful. I have to say that I have no gem knowledge- I am a novice and I ordered the Sphene for healing purposes, so I am hoping they are real. I have no way of confirming if that is true. But they are beautiful!
Posted By Amy in July, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
If you want a gem that you can trust to not be treated, or if it is it's disclosed this is the place! There's something for everybody. I really like knowing that the picture of the item is the one I'm buying, not a sample or stock photo. If you make jewelry, buy gems here! You can even buy a gem and have it set by a jeweler. Again, they have an amazing inventory, and prices are more than fair. You won't be disappointed! I just wish they sold uncut gems. Sometimes I just want a specimen in the crystal form. I'm surprised they had no quartz from Arkansas, but they have a great selection of anything I've ever looked for.
Posted By Nita in July, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
I love the website easy to find what I’m looking for very co friendly and very trustable resource and fare pricing
Posted By Seeny in October, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
Well fell in love with the site right away ordered two many items I knew I would return a few. Decided I wanted to invest in a sapphire emerald or ruby after more research. The diamonds that I received we just stuck together just ordered one more I will have 10 in all diamonds two yellow six white. I'm so very happy I didn't know what I was going to keep and definitely diamonds were winner.
Posted By Kaitlin m in April, 2021
Source: Bizrate

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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

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