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A doublet is a type of assembled gem composed in two sections. [1] It is sometimes used to imitate other, more expensive gems. 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.
This is a descriptive list of Stone Age art, the period of prehistory characterised by the widespread use of stone tools. This article contains, by sheer volume of the artwork discovered, a very incomplete list of the works of the painters, sculptors, and other artists who created what is now called prehistoric art.
A 17th century English lapidary text. The etymological root of the word lapidary is the Latin word lapis, meaning "stone". [5] In the 14th century, the term evolved from lapidarius, meaning 'stonecutter' or 'working with stone', into the Old French word lapidaire, meaning 'one skilled in working with precious stones'.
Because strontium titanate and glass are too soft to survive use as a ring stone, they have been used in the construction of composite or doublet diamond simulants. The two materials are used for the bottom portion (pavilion) of the stone, and in the case of strontium titanate, a much harder material—usually colorless synthetic spinel or ...
The runestone styles were part of the general evolution of art in Scandinavia. This is a part of the decoration of the Urnes stave church which is in the same as the later runestone styles. The term "runestone style" in the singular may refer to the Urnes style. The style or design of runestones varied during the Viking Age.
A ruff from the early 17th century: detail from The Regentesses of St Elizabeth Hospital, Haarlem, by Verspronck A ruff from the 1620s. A ruff is an item of clothing worn in Western, Central and Northern Europe, as well as Spanish America, from the mid-16th century to the mid-17th century.
In Slocum stone, the play of color takes the form of tinsel-like patches. The visible structure is also considerably different; in the imitations, the body of the stone is transparent to translucent from certain angles, whereas ammolite is entirely opaque. Gemologically speaking, ammolite can be grouped with the shell-based marbles.
The rock here is described as being a "pink dessert sandstone from the Permian age showing clear signs of dune bedding". [6]The cup and ring marks are composed of two 'panels' with several hundred 'cup and ring' and other glyphs or carvings in a range of styles, ranging from single shallow cups through to deeper cups with multiple rings.