Gia colored stones Study guides, Class notes & Summaries

GIA Colored Stones - Ruby Test 2024...

Precious opal is made of billions of uniform submicroscopic _________ ___________, stacked in an orderly pattern. - Answer-silica spheres Play-of-color is produced by the interaction of _________ with opals internal structure of stacked silica spheres. - Answer-light _________ _________ commands the highest prices of all opal types. - Answer-black opal _________ ________ makes of the bulk of commercial-quality opal on the market. - Answer-white opal ____________ ____________ often makes bo...

Ruby can command the highest ______-__________ price of all colored stones. - Answer-per-carat Ruby rates ____ on the Mohs hardness scale, so it's ideal for frequently worn jewelry. - Answer-9 The most valuable ruby colors are red to slightly ____________ red with medium to medium-_______ tones and __________ saturation. - Answer-purplish, dark, vivid Not everyone agrees on the _______________ between ruby and pink, purple, or orange sapphire. - Answer-division The trace element _________...

Clarity characteristics that affect these three things have the most influence on value. - Answertransparency, brilliance, durability Cutters often leave cavities in _______ __________ areas to avoid weight loss from expensive rough. - Answer-less noticeable Five factors that determine the influence of clarity characteristics on marketability (NSNPR). - Answernature, size, number, position, relief Some types of colored stones are typically more included than others, so they're assessed acco...

The word "___________," when used aloe typically refers to the blue variety of corundum. - Answersapphire Blue sapphire is one of the most ____________ colored stones, especially in the US. - Answer-popular The most highly valued blue sapphires are ___________ blue to _____________ blue, in __________ to ___________-__________ tones, with __________ to _________ saturation. - Answer-velvety, violetish, medium, medium, dark, strong, vivid The trace elements ______ and ___________ cause the...

Differing amounts and combinations of the trace elements ______, ___________, and _____________ cause most fancy sapphire colors. - Answer-iron, titanium, chromium ________________ typically have the highest per-carat value of all fancy sapphires. - Answerpadparadschas Fine ________ sapphires regularly command top prices, sometimes comparable to padparadschas. - Answer-pink _________ sapphires are often heat-treated to achieve a more valuable pink or red hue. - Answer-purple Recent years h...

The word "___________," when used aloe typically refers to the blue variety of corundum. - Answersapphire Blue sapphire is one of the most ____________ colored stones, especially in the US. - Answer-popular The most highly valued blue sapphires are ___________ blue to _____________ blue, in __________ to ___________-__________ tones, with __________ to _________ saturation. - Answer-velvety, violetish, medium, medium, dark, strong, vivid The trace elements ______ and ___________ cause th...

Tanzanite was discovered in... - ANSWER 1967 Tanzanite is a transparent variety of... - ANSWER zoisite All the gems in this chapter share the optical property of _______________________. - ANSWER pleochroism The first tanzanite was discovered in North Tanzania in __________. - ANSWER Merelani Who named tanzanite? - ANSWER Tiffany's

GIA Colored Stones Complete Final Exam Window - ANS-An area of weak saturation in a transparent gemstone's bodycolor that usually results from the way the gem was cut. Xenocryst - ANS-A "foreign crystal" that formed in unrelated rock and was brought to the surface as a passenger in magma. A gem produced by, or derived from, a living organism is - ANSorganic Which of the following is an organic gem ? - ANS-Amber A substance that consists of atoms of only one kind is a - ANSChemic...