This turquoise can be purchased, write to me on WhatsApp: +7 999 043-73-49
See also: "How to choose real and high-quality turquoise" kzfaq.infoiqbiTjB-JjM"
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Take Olga Melikyan's basic gemology course of 11 lessons in video format. Download and watch videos, pass tests, get confident basic knowledge about gems:
COURSE PROGRAM
Lecture 1
1. Why classify stones? Who is useful, and who needs this information. - What is gemology - Why is knowledge about precious stones more expensive than the stones themselves 2. Criteria for determining a precious stone, or ornamental. 3. Types of accepted classifications in Russia and in the world. 4. Fluctuations in the value of precious stones of different orders. 5. Fluctuations in the cost of jewelry and ornamental stones.
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Lecture 2. PROPERTIES OF PRECIOUS AND PRECIOUS STONES
1. Why know the properties of stones? How to apply this information? 2. Morphology of crystals (appearance). 3. Physical characteristics and properties of crystals: hardness, strength, cleavage, dispersion, asterism, etc. 4. Color change properties (pleochroism, alexandrite effect). 5. Unique properties (irization, opalescence, fluorescence).
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Lecture 3. COLOR IN PRECIOUS STONES
1. How knowledge about color affects the evaluation of a precious stone 2. What are the elements of "dyes" (chromophores) 3. Defects in the crystal lattice 4. Complex cases of the appearance of color in colored stones 5. Why do some stones fade in the sun, while others do not
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Lecture 4. GEOGRAPHY OF PRECIOUS STONES AND GEMS
06:46 1. WHICH ROCKS ARE PRECIOUS STONES AND WHICH ARE NOT 09:08 Crystallization of minerals Magmatic process 09:45 Where are more than 70% of all gems found? 12:43 Minerals of sedimentary rocks 14:05 Conditions for the formation of turquoise
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15:34 CHARACTERISTIC COMBINATIONS OF GEMS IN DEPOSITS 16:26 Characteristic gemstones of pegmatites 18:14 Minerals of hydrothermal veins 19:13 Gold in hydrothermal veins 20:14 Alluvial placers, which gemstones are found 21:21 Why alluvial placer diamonds are the best and surpass quality diamonds from kimberlite pipes? 22:22 Characteristic combinations of precious stones in metamorphic rocks 23:42 Under what specific conditions are emeralds formed? 24:46 Characteristic precious and jewelry in sedimentary rocks
25:09 WHY TO KNOW INFORMATION ABOUT THE REGION OF STONE MINING, HOW DOES IT AFFECT THE FINAL COST OF THE PRECIOUS STONE? 26:20 Comparison of Colombian and Zambian emeralds 27:18 Comparison of Myanmar and Thai rubies 28:20 Comparison of Kashmir and Sri Lankan sapphires 29:09 Comparison of Ural and Brazilian alexandrites
30:14 REGIONS AND COUNTRIES OF MINING WHERE THE BEST PRECIOUS STONES ARE FOUND
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Lecture 5. INCLUSIONS IN PRECIOUS STONES AND GEMS
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Lecture 6: MODERN TYPES OF ENHANCEMENT OF PRECIOUS STONES
Question 1: Why do you need to know information about modern types of stone refining. Question 2: Types of refining to change the color of the stone. Question 3: Types of refining to change the purity of the stone. Question 4: Refinement of substandard stones. Question 5: Evaluation of refined stones by gemologists, the range of possible value of refined gems.
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Lecture 7
Lecture 8
Lecture 9. "CERTIFICATION OF PRECIOUS STONES"
Lecture 10. FEATURES OF WORLD AND RUSSIAN LEGISLATION REGARDING PRECIOUS STONES
Lecture 11. The study of color in colored gemstones according to the Munsell and GIA system. Comparison of two systems, which is better for selecting quality gems and why.