Articles

Doctored Synthetic Sapphire

Prima facie glance can be futile, a stone having coarse skin surface with mother rock attached gives the appearance of a perfect mined crystal.

Download

Swindling with Gemmological Reports

Swindling is not new for the field of Gemstones and Jewellery. Treatments on gemstones are usually done for enhancing their colour, clarity and beauty, ultimately to get their price hike. 

Download

Synthetic Moissanite with Hexagonal Negative Cavities

Synthetic Moissanite (Silicon Carbide) a well-known substitute of Diamond. But easily differentiable from Diamond with its strong doubling and fine sub-parallel stringers oriented parallel to its optic axis direction.

Download

Sapphire Doublet

Several types of assembled stones are formed with motive to create a bigger stone, by combining smaller stones together, in less of price to fetch more of money.

Download

Change in Emerald's reaction under Chelsea Filter with the change of Illumination

Study of chelsea filter reaction under different illuminations of an Emerald, hosting other Emerald Crystal.

Download

Hoax Diamond

Topaz doctored rough was beautifully polished depicting striations parallel to octahedron edges and were made as in to show Trigons, natural growth markings present on diamond octahedron crystals.

Download

Spurious Diamond

Spurious diamonds, which are not actually diamond but are rather some other natural or synthetic stone, are getting frequent to encounter. Such stones are cut in Octahedral shape, to look like Natural Diamond Rough.

Download

Prasiolite with inclusion influenced by Brazil-Law Twinning

Prasiolite displaying prominent Brazil-law twinning, with very sharp twinning planes when the sample was observed parallel to the optic axis between crossed polarizing filters.

Download

Phosphorescence in Synthetic Sapphire

Colourless synthetic sapphire concluded synthetic on the basis of curved growth banding in Diamond view instrument with unusual phosphorescence.

Download

It's Like Thousand Bubbles Bursting Inside a sapphire.

One of the frequent inclusion to see in sapphire is phase inclusion, which is not as such surprising to talk about. Although, this phase inclusion must have surprised Sir David Brewster, in 1823, when it was first time encountered.

Download YouTube Link

Humbug of Chilka Lake

Rare Blue sapphire, emerald, and coral producing mollusks are found in Chilka Lake, of Odisha state on the east coast of India.!!!!!!

Tricksters are deliberately putting cut and polished glasses, fashioned in the shapes in which gemstones are usually traded, inside the mollusks with tweezers and then killing them brutally by opening them in front of buyers to form false authenticity in the eyes of buyers.

Download

Opal - Quartz Rock With Polymer Skin

Prima facie, stone was appearing like Opal, but initial gemological testing results (R.I. 1.580 / S.G 2.34) were not identical to Opal.  Conclusive identification could be made on LRS and the stone was identified to be rock consisting of Quartz and Opal. Stone was coated with the polymer, to give that strength and thickness.

Download

Color - Change Garnet in Diamond

IaA diamond, with clarity grade of SI2, contained several colorless crystals and one surface-breaking grayish green crystal. Under incandescent light, the grayish green crystal appeared purplish red, displaying a strong color-change phenomenon.

Download

CVD Synthetic Diamond With Unstable Color Centers

The 1.42 ct CVD synthetic diamond showed a distinct grayish blue color after exposure to the short-wave UV radiation of the DiamondView.

Download

Natural Emerald With Hound's Tooth Like Growth Pattern

Inclusion analysis is the vital organ of gemmology. Hound’s tooth growth pattern / Chevron pattern is one of the characteristic inclusions for Hydrothermal Synthetic Emeralds. In Natural Emerald conical growth pattern was observed in the c-axis direction, resembling hound’s tooth like / chevron growth pattern.

Download