1.54 ct. Stibiotantalite
Color: Very Light Yellow
Clarity: Eye Clean
Origin: Mozambique
Cut: Custom
Treatments: None
Measurements: 6.6 x 4.7 mm
It is extremely difficult to source any Stibiotantalite over 1 carat in weight, let alone a clean one with a precision cut. Nearly all the stones left in the market are old stock and there is little if any new material coming out - exactly the case with this very old collection stone that was likely cut decades ago. It’s a fine gem, with all the best qualities of the material and is extremely well cut - not even a hint of being shallow or asymmetric as is often the case with these. Remarkable clarity as well.
An exceptionally interesting 'rare gem' material, Stibiotantalite has one of the highest refractive indexes in the gem world (2.37-2.45) and a very high specific gravity at around 6.7 (vs. 4.6 for Zircon and 3.5 for Diamond). Furthermore, it is reasonably hard and is capable of taking a great polish. This is a fantastic gem in all regards.