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GEMSTONES

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GEMSTONES

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  1. GEMSTONES

  2. DEFINITION • MINERALS that are cut • RARE= valuable • Usually above 7 on hardness scale

  3. Gold • Pure gold is soft (malleable), heavy and expensive! • Gold in jewelry is an alloy (mix of metals) • K= % of gold • 24K= 100% gold • 14K = ?

  4. The 5 C’s • Cut • Clarity • Color • Carat • Cost

  5. CUT • Ground down on a grinding wheel • Faceting- for TLT-TPT • Lets light through mineral; adds brilliance • Cabachoning- for OPQ

  6. Diamonds in the “rough”

  7. Round brilliant

  8. Faceting

  9. Cabachoning

  10. Cabachons

  11. Clarity • Amount of imperfections • Specs • Cracks • discoloration

  12. Color • Colored gems= deep color, more $$ • Diamonds= D-Z scale (see handout) • Exception is Z+ fancy diamonds are colored diamonds- most rare of all

  13. D, Fl I 3

  14. Fancy Diamonds • More rare than traditional diamonds.

  15. Carat • Weight of gemstone • 1 ct= 200 mg • 100 pts.= 1 carat • TGW= total gem weight for many stones together

  16. Cost • Depends on previous 4 C’s

  17. FAMOUSDIAMONDS

  18. How Do Diamonds Form?Contrary to what many people believe, most diamonds do not form from coal

  19. CULLINIAN 9

  20. CULLINAN ISTAR OF AFRICA530 CTS.

  21. Cullinan II: 317 cts.

  22. Originally 186 cts. Now 108 cts. Queen of England Kohinoor

  23. HOPE DIAMOND; 65 cts. • New setting • Nov. 2010

  24. Smithsonian

  25. Tiffany yellow

  26. PINK SUNRISE30 CTS.

  27. DeYoung Red5.03 cts.

  28. Taylor-Burton Diamond68 cts.

  29. Smithsonian diamonds

  30. MILLENIUM STAR- 230 CTSD, IF (“Millenniums come and go, but a diamond is forever” DeBeers

  31. The Regent Diamond • 410 carat diamond when originally found. • Later cut down to 140 carats. • Today is at The Louvre.

  32. Birthstones

  33. GarnetJanuary birthstone

  34. ALEXANDRITE 1.6 ct $16,000

  35. OPAL(hydrated quartz)

  36. TOPAZNovember birthstone

  37. EmeraldMay birthstone

  38. PeridotAugust Birthstone

  39. Synthetic gemstones • Advantages? • Less expensive • Less flawed • Disadvantages?