Size/Shape

Cutting

Proportions

Color

Clarity

Origin

Treatment

Weight

18.7 x 14.6mm Cushion

Precise 'Radiant' Facet Pattern, Expert Job, High Polish

10.25mm, Full Flash, No Windowing

Medium-Dark Yellowish Green (Very Similar to Pakistani Peridot)

Eye-Clean, with Slight Haziness Typical of Green Zircon

Madagascar

Not Treated, 100% Natural

26.48 Carats

This is an exceptionally large example of 'low' metamict Green Zircon.  We have not found a reference to a Green Zircon larger than this recently mined gem.

Normally found in Burma or Sri Lanka, this Green Zircon is from Madagascar, and was brought over to Bangkok recently in rough form.

This stone has very little birefringence, and shows almost no doubling of facet junctions.  There are some very fine and interesting 'skeletal' inclusions which can be found with a loupe.  There are also some zoning planes, including one in the bottom of the stone which we have shown in one of the photos.  It can be seen from the backside if the stone is held at just the right angle.  All these features are very typical of 'low' metamict Green Zircon, as is the slight haziness which can also be observed. 

Besides this haziness, it is very fortunate that no inclusions are apparent with the naked eye.

This cushion was faceted and polished by an American master gem cutter with 20 years experience cutting all types of gemstones.  We decided to utilize a 'Radiant' pattern to make this stone special, even though a step-cut cushion would have weighed more .  It was a challenge to cut and polish this stone, but the skill and effort required is obvious in the results.  The pattern, angles, facet junctions, and the high polish, all combine to make this a very impressive gem.