FAQ : What is a doublet opal? What is a triplet opal? What is the
difference between doublets, triplets, and solid opals? What happens when
doublets or triplets get wet? Why do some opals go cloudy? How should I care
for a doublet or triplet?
One
of the most basic things you should familiarize yourself with when expanding
your education on opal are those partially man made stones known as doublets and triplets. In summary, these stones are slices 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. However doublets and triplets are generally much
cheaper than solid black opals as they only contain a small amount of
genuine opal.
- A black backing which is made
of either black industrial glass, black potch (colourless opal), hard
plastic, brown ironstone or sometimes vitrolite.
- A thin slice of opal (normally crystal
opal or white
opal). The thickness of the opal in a doublet can vary, however
it is generally thicker than the opal found in a triplet. The edges of the
slice of opal are generally rounded off (if there is enough opal) to give
the stone a cabochon (domed top).
Doublets
can usually be identified by looking at the side of the opal - if the stone has
been adhered together you will notice that the line where the colored opal and
the black backing meet is perfectly straight. This is necessary for the two
layers to be adhered together. If a doublet is set in the jewel with the sides
covered, it is extremely difficult, even for an expert, to tell whether it is a
doublet or a solid opal. Since the top of the stone consists of pure opal, it
therefore appears exactly like a black opal, and doublets thus have a much more
natural appearance than triplets.
See below - examples of an opal doublet from several angles
- A black backing as above
- A paper-thin slice of opal in
the middle
- A clear glass, quartz, or
plastic capping in the shape of a dome. The slice of opal in a triplet is
usually extremely thin (paper-thin) so the clear capping serves to give
the stone a nice cabochon on top. The clear capping may also magnify the
color of the opal slightly, and also serve to protect the opal.
Because
triplet opals have a clear non-opal capping on top, it is easy for an
experienced person to identify a triplet immediately by the appearance of the
stone. Triplets usually have a 'glassy' appearance and the light reflects
differently from the top of the stone. You can look at the side of the stone to
identify a straight line where all the layers meet, and also look at the back
of the stone. If the back of the stone appears to be black plastic then you are
not looking at a solid stone. Be aware however that it is also very common for
a backing to be made of black potch (exactly the same stone which forms the
backing of a natural black opal)
or brown ironstone (which is also the natural backing for Queensland
boulder opals).
Triplets
are normally cheaper than doublets because they contain less real opal. Because
the top of the stone can be made from synthetic material, triplets can be a lot
more resistant to impact than solid or doublet opal stones. (Opal by its nature
is a fragile gemstone).
See below - examples of an opal triplet from several angles.
Because
opal doublets and triplets consist of layers which are glued together,
prolonged exposure to water may cause lifting between the layers and
infiltration of water. (This does not mean your opal will be ruined if you wear
it in the shower once, or are caught in the rain.) If water penetration occurs,
a doublet or triplet will take on a 'foggy' or grey appearance. You may even
notice the appearance of condensation inside the stone. You should avoid
getting a triplet or doublet opal wet to avoid water penetration.
Please note: There is a lot of confusion regarding the care of opals because of
the different caring instructions for solid opals as opposed to doublets /
triplets. Solid opals are fine in water - it's only doublets and triplets which
need to be kept out of water to avoid water penetration. Getting a solid opal
wet will do no damage whatsoever.
Cleaning - Doublets & triplets may be wiped with a damp soft cloth and mild
detergent, but should never be soaked or immersed. Avoid bleach, chemicals,
cleaners, and ultrasonic cleaners.
Opal
doublets and triplets can be a fantastic alternative to solid stones as they
are much cheaper than solid black opals. Solid opals with the same appearance as
an opal triplet can be ten times the price as they are rare and valuable;
therefore they serve a useful purpose in making beautiful dark opals
affordable. However, you need to be aware of what you are buying, and know how
to correctly care for doublets and triplets to avoid water damage.
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