GRADING REPORT DIZI175
- Identification: Natural Unheated & Untreated Zircon
- Carat: 1.75
- Shape: Square Brilliant Multi-Star
- Measures: 6.02x5.98x4.74mm
- Color Grade: n.a.
- Tone: Light 20
- Color Zoning: None
- Clarity: Free of Inclusions
- Cutting Grade: Excellent (precision cut)
o Brilliancy: 99%
o Depth: 79%
- Origin: Sri Lanka
- Treatment: None
Certificate No: IGI 365922475
Overall Grade: Excellent+
Comment: Fantastic sparkler, with just a hint of color, golden brown, yellow golden, but more tinted white than colored. The high-girdled, artfully precision-cut is pretty ideal for a zircon, presenting a ring of stars inside the gem, one of which I have taken into a close-up below. These stars, each sparkling in rainbow colors, are mirrored in double and triple reflections thanks to the dispersion only high zircon can produce (and diamonds or sphene with their individual strength and weaknesses). As so often, zircon pales the competition. No inclusions, no treatments, no window. 6mm square of brilliancy with a hint of pleasant color. Pure white zircons are nearly always heat treated, though exceptions exist. The brighter a zircon is colored, the higher its dispersion, as a rule, which is why bright yellow or orange colored zircons are the best sparklers, while dark toned specimens bring denser colors to the table but less brilliancy. Trade-offs, as always in life, though there is a more complex process of geological aging at play for which we have delivered untreated rough zircons to several universities over the years. They are then used to determine the age of its environment. I might try to summarize the science behind it sometimes but not today.
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