Ass # 18- Diamond Simulants

<p>By assessing its refractive indices for different wavelengths (C)</p> Signup and view all the answers

<p>Light splits into two beams due to crystal symmetry. (C)</p> Signup and view all the answers

<p>Small critical angle (A)</p> Signup and view all the answers

<p>They have similar thermal conductivity values. (A)</p> Signup and view all the answers

<p>Doubling observation (B)</p> Signup and view all the answers

<p>Physical and chemical properties (D)</p> Signup and view all the answers

<p>Lower brilliance than diamonds (A)</p> Signup and view all the answers

<p>Melting powdered materials over a flame (A)</p> Signup and view all the answers

<p>Foilbacks (C)</p> Signup and view all the answers

<p>Refractive index and dispersion (B)</p> Signup and view all the answers

<p>Synthetic sapphire (C)</p> Signup and view all the answers

<p>It becomes more brilliant (A)</p> Signup and view all the answers

<p>High hardness (C)</p> Signup and view all the answers

<p>Early 1700s (D)</p> Signup and view all the answers

<p>Physical properties (A)</p> Signup and view all the answers

<p>Cubic zirconia (CZ) (C)</p> Signup and view all the answers

<p>Heft (B)</p> Signup and view all the answers

<p>Exceptional hardness (A)</p> Signup and view all the answers

<p>It is not accurate on fancy cuts or poorly proportioned stones. (C)</p> Signup and view all the answers

<p>5.80–6.00 (A)</p> Signup and view all the answers

<p>Polished or faceted girdle (A)</p> Signup and view all the answers

<p>Twinning wisps (D)</p> Signup and view all the answers

<p>Synthetic moissanite (D)</p> Signup and view all the answers

<p>Subadamantine (B)</p> Signup and view all the answers

<p>Abrasions and scratches (B)</p> Signup and view all the answers

<p>They are generally eye-clean and lack many inclusions. (D)</p> Signup and view all the answers

<p>Use a neutral description for the take-in form. (A)</p> Signup and view all the answers

<p>Synthetic cubic zirconia (D)</p> Signup and view all the answers

<p>A positive attitude that builds trust and satisfaction. (B)</p> Signup and view all the answers

<p>Overestimating the gem’s value based on assumptions. (C)</p> Signup and view all the answers

<p>Higher dispersion (C)</p> Signup and view all the answers

<p>Synthetic moissanite tends to have a yellowish or greenish tint (A)</p> Signup and view all the answers

<p>They are made up of two or more components (C)</p> Signup and view all the answers

<p>By rocking the jewel back and forth under light (D)</p> Signup and view all the answers

<p>They have additional coatings of synthetic diamond particles (B)</p> Signup and view all the answers

<p>Greater fire (C)</p> Signup and view all the answers

<p>Low specific gravity relative to diamonds (A)</p> Signup and view all the answers

<p>CZ colors are more saturated (D)</p> Signup and view all the answers

<p>It can imitate black diamonds effectively (A)</p> Signup and view all the answers

<p>9.25 (D)</p> Signup and view all the answers

Measures how quickly a gem's surface temperature changes when heated.

Diamond's surface temperature changes quickly compared to most simulants.

Moissanite can conduct electricity; most diamonds do not.

Examines reflections at the pavilion facet junctions.

Difference between the refractive index of red and violet light.

Tests for light passing straight through a facet.

A material that looks like a diamond but isn't.

A tool for simultaneously measuring both thermal and electrical conductivity.

Simulants vary widely in their physical and chemical properties, as they are not real diamonds and lack the necessary attributes.

Early diamond simulants that were made of glass.

Gemstones, sometimes simulants, that have metal foil behind them to enhance their appearance.

A common name for imitation diamonds, often made of glass or plastic.

Simulated diamonds, created in a lab through a crystal growth process, using powdered materials melted over a flame.

Simulant use dates back to the late 1700s and evolved due to the cost of diamonds.

Simulants are often much more widely available and cheaper than natural diamonds/lab-grown diamonds.

Simulants provide a more affordable way for people to achieve the look of a diamond

To offer a similar look and feel to diamonds, but at a more accessible price.

A test that identifies simulants based on their distinctive color flashes when viewed under darkfield lighting. CZ, for example, shows a bright orange flash.

A measure of a substance's density relative to water, used to distinguish diamonds from simulants.

Comparing a stone's size to its weight to identify density differences.

Diamond is the hardest known natural material, leaving sharp facet junctions and superior polish.

Simulants are softer than diamonds, resulting in rounded facet junctions and potential scratches.

Diamond's superior polish creates an adamantine luster, reflecting light brilliantly.

Examining the girdle (diamond's edge) can distinguish older diamonds from simulants.

Natural diamonds often have inclusions like twinning wisps, graining, and etch channels, absent in simulants.

Lab-grown diamonds lack certain inclusions found in natural diamonds, helping to differentiate them from simulants.

Cubic Zirconia (CZ) is a popular diamond simulant known for its brilliance, luster, and availability in various colors. It is often used as a counterfeit.

Synthetic Moissanite is another diamond simulant with high fire and brilliance. It is less common than CZ, but more expensive to produce.

A diamond simulant made by combining two or more materials, often using different materials for the crown and pavilion.

An early type of assembled simulant composed of a reddish garnet top fused to a glass base.

A simulant typically CZ or Moissanite with a thin coating containing synthetic diamond particles, added for enhanced appearance.

CZ often has highly saturated colors while natural diamonds typically have less saturated color.

Synthetic Moissanite has high hardness, approximately 9.25 on the Mohs scale, making it durable.

Moissanite exhibits double refraction, meaning light splits into two rays within the gem. It also has a lower Specific Gravity than diamond.

Black synthetic moissanite is often used to imitate black diamonds.

Examine facet junctions under magnification for signs of coatings, uneven luster, or iridescent facets to identify possible simulants.

Blemishes in diamonds that include growth marks, such as trigons or parallel grooves, and indicate the diamond's natural origin.

Crystals or needles within diamonds, which can aid in identification. However, confirm that it isn't another naturally colorless stone.

Manufacturers of diamond simulants often give their products catchy names to boost sales, like 'Rainbow Magic Diamond' or 'Diamontina.'

Simulants, usually CZ, with a coating of diamond particles to mimic a diamond's appearance.

Some simulants were wrongly labeled in the past. For example, colorless zircon was called 'Matura diamonds,' and colorless quartz was called 'Herkimer diamonds.'