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2. Doublet (lapidary) - Wikipedia

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

   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.

3. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   Jewelry applications of precious opal can be somewhat limited by opal's sensitivity to heat due primarily to its relatively high water content and predisposition to scratching. [11] Combined with modern techniques of polishing, a doublet opal can produce a similar effect to Natural black or boulder opal at a fraction of the price.

4. Lapidary - Wikipedia

   en.wikipedia.org/wiki/Lapidary

   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'.

5. List of jewellery types - Wikipedia

   en.wikipedia.org/wiki/List_of_jewellery_types

   Celibacy vow ring; Medical alert jewelry; Membership pin; Military dog tags; Pledge pins; Prayer jewelry Japa malas; Prayer beads; Prayer rope; Rosary beads; Puzzle jewelry. Puzzle ring; Signet ring; Thumb ring; Gemstone Jewelry

6. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   Sterling silver jewellery may be plated with a thin layer of 0.999 fine silver (a process known as flashing) or plated with rhodium or gold. Base metal costume jewellery may also be plated with silver, gold, or rhodium for a more attractive finish.

7. Ring (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Ring_(jewellery)

   Ruby ring. A ring is a round band, usually made of metal, worn as ornamental jewelry.The term "ring" by itself denotes jewellery worn on the finger; when worn as an ornament elsewhere, the body part is specified within the term, e.g., earrings, neck rings, arm rings, and toe rings.