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GIA-Diamonds > GIA-DDG 18 > Flashcards

GIA-DDG 18 Flashcards

1
Q

Any material that is not diamond or synthetic diamond, but which imitates a diamond’s appearance and is used in its place

A

Diamond simulant

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2
Q

Two separate pieces of material fused or cemented together to form a single assembled stone

A

Doublet

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3
Q

Gemstone or simulate with a thin metallic foil or mirroring film applied to its pavilion

A

Foilback

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4
Q

A foilbacked, colorless, lead-glass diamond imitation

A

Rhinestone

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5
Q

Process of distinguishing natural minerals and gems from each other as well as from synthetics, simulants, and treated gems

A

Separation

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6
Q

An instrument that measures thermal conductivity to help separate natural and synthetic diamonds fro most simulants

A

Thermal tester

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7
Q

Which is the following is a natural gem?

A

Zircon

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8
Q

Diamond imitations called “paste” are actually

A

Glass

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9
Q

Diamond simulants

A

only look like diamonds

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10
Q

The thermal diamond tester helps separate diamond from most simulants because of diamond’s excellent ability to

A

Conduct heat

Diamond has higher thermal conductivity than almost any simulant. This means it stays cooler longer when exposed to heat, so a diamond feels cooler to the touch than a simulant.

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11
Q

The term “Diamond Simulant”

A

Refers to a stone that looks like a diamond but has different optical, physical, and chemical properties

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12
Q

Which diamond simulant shows noticeable doubling and strong fire?

A

Synthetic rutile

  • may find in some estate jewelry
  • Quite brilliant but not as much as diamond
  • Very high dispersion-rainbow colors are obvious
  • low hardness–quickly shows signs of wear
  • doubly refractive
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13
Q

Which of the following typically has a waxy to granular girdle surface?

A

Diamond.

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14
Q

The easiest way to separate diamond from synthetic moissanite is by checking for

A

Doubling

  • Introduced in late 1990s
  • First developed for industrial use
  • slightly yellowish or greenish
  • 9 1/4 MOHS scale
  • less brilliant than diamond but more fire than diamond and CZ but less fire than synthetic rutile
  • Doubly refractive
  • Lower SG than diamonds (it’s lighter than diamond)
  • Won’t see bearding or naturals around the girdle
  • the only simulant that can fool some thermal testers
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15
Q

The easiest way to separate diamond from synthetic cubic zirconia is by checking for

A

thermal conductivity.

  • Entered market in 1970s
  • Most commonly used simulant
  • SG is heavier than diamond
  • Almost as brilliant and lustrious as diamond
  • Mohs hardness of 8 1/4
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16
Q

The easiest way to separate diamond from zircon is by checking for

A

Doubling

  • A natural gem
  • More brilliant than glass and has medium fire
  • Doubly refractive
  • Chip and scratch easily
  • Heat treatment makes them brittle, so rarely used today
17
Q

Which of the following properties is higher in GGG than in diamond?

A

Specific Gravity

  • YAG was created n 1960s–lab grown crystals with garnet-nlike cubic crystal structure
    *
18
Q

A diamond imitation that’s foilbacked or composed of colorless lead-glass might also be called a

A

Rhinestone

19
Q

A stone formed by cementing two separate pieces of material together is called a

A

Doublet

20
Q

All diamond simulants rank lower than a diamond in

A

Hardness

21
Q

Some diamond simulants display “see-through’ because, compared to diamond, they

A

Have much larger critical angles

Most have a lower refractive index and larger critical angle than a diamond, leading to light leakage through the pavilion.

22
Q

What is a diamond’s Specific Graving (SG) rating?

A

3.52

23
Q

What is a diamond’s Refractive Index (RI)?

A

2.417

24
Q

What are three examples of flame fusion simulants?

A
  1. Rubies
  2. Sapphires
  3. Spinel

Created in late 1800s. Often found in clas rings and imitation birthstone jewelry

GIA-Diamonds (6 decks)

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