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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    The top layer also acts as a magnifier, to emphasize the play of color of the opal beneath, which is often an inferior specimen or an extremely thin section of precious opal. Triplet opals tend to have a more artificial appearance and are not classed as precious gemstones, but rather "composite" gemstones.

  3. Ammolite - Wikipedia

    en.wikipedia.org/wiki/Ammolite

    Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]

  4. Doublet (lapidary) - Wikipedia

    en.wikipedia.org/wiki/Doublet_(lapidary)

    Opal Doublet. A garnet and glass doublet uses a top portion of natural garnet fused to any color of glass to imitate a gem. The color of glass used in the doublet is all that is seen, as the garnet provides no color. If seen in reflected light, a separation line may be seen. A harder garnet makes the stones more durable.

  5. Opals Are One of the Trendiest Stones Right Now—But ... - AOL

    www.aol.com/opals-one-trendiest-stones-now...

    Opals may have been around for thousands of years, but they’re having a major resurgence in the jewelry world right now. Chairish included opals as one of its top trend predictions for 2025, ...

  6. Opalescence - Wikipedia

    en.wikipedia.org/wiki/Opalescence

    Each of the three notable types of opal – precious, common, and fire [3] – display different optical effects; therefore, the intended meaning varies depending on context. The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is ...

  7. World's most expensive opal literally glows in the dark - AOL

    www.aol.com/news/2015-08-13-world-s-most...

    In fact, as it gets darker around the opal, the opal appears ever more vibrant. The stone's vivid and sparkly nature is in stark contrast to Coober Pedy, Australia where it was discovered.

  8. Triplet lens - Wikipedia

    en.wikipedia.org/wiki/Triplet_lens

    A triplet lens A Steinheil triplet telescope eyepiece. The three lenses may be cemented together, as in the Steinheil triplet (optimized for finite conjugate ratio) or the Hastings triplet (optimized for infinite conjugate ratio). [2] Or a triplet may be designed with three spaced glasses, as in the Cooke triplet. The former has the advantage ...

  9. Triplet - Wikipedia

    en.wikipedia.org/wiki/Triplet

    The Triplets, a Spanish children's book; The Triplets (band), a Latin pop group; Binghamton Triplets, a minor league baseball team; A triplet, a kind of assembled gem; In music, a tuplet of three successive notes of equal duration "The Triplets", Tyler Johnson, Ondrej Palat, and Nikita Kucherov of the 2014–15 Tampa Bay Lightning

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