A natural incised omphacite jade bangle in dark spinach green color.
Approximate size 2.36 inches inside diameter x 0.28 inches thickness x 0.63 inches width
Condition : There is a vertical crack up to top and round the front of the band in one small area
'A' grade jade untreated.
Certificate from an accredited lab will be provided.
Many historic jade items consist, fully or partly, of omphacite, which belongs to the same group of minerals (pyroxenes) as jadeite, grows in the same crystal system and has similar causes of colour. In addition to their mineralogical and chemical affinities, their appearances are very similar, too: both minerals form dense, solid aggregates of closely interlocked crystals yielding the supreme toughness jade is known for. Distinguishing omphacite from jadeite calls for sophisticated analytical equipment; moreover, the two minerals on occasion merge to form rocks, making the identification of a single mineral futile. For these reasons, Gubelin Gem Lab has decided to consider omphacite a type of jade alongside jadeite and nephrite, the two minerals already broadly recognized as jade.