Coloured stones Preliminary Exam

Features

Object
Loose stone

Object

The object specifies whether we have received a single stone, a batch or a jewel, and the type of jewel.

Identification
SAPHIR (NATURAL CORUNDUM)
Geographic Origin
Sri Lanka (Ceylon)
Shape – Cut
Oval - Brillant / Step cut

Shape – Cut

The shape, cut and dimensions describe the external appearance of the stone. When you deposit a jewel with several stones, or batches, we note the diametrical variation of the batch.

Measurements
12.16 x 9.85 x 6.15 mm

Measurements

The shape, size and dimensions describe the external appearance of the stone. When you deposit a jewel with several stones, or batches, we note the diametrical variation of the batch.

Mass
13.19 ct

Mass

The weight of the stones is indicated in carats (1ct = 0.2 g) to two decimal places.

Rounding is done according to the 3rd decimal place: if it is less than 9 then no rounding, if it is equal to 9 then round up. For example: 0.9990 ct is 1.00 carat but 0.9989 ct is 0.99 carat.

In the case of jewellery set with stones, it is weighed in grams to two decimal places. The rounding rule that applies is the arithmetic rounding.

Opacity
Transparent