This is an outstanding, exceedingly rare Montana Sapphire NO HEAT 42.75 carat platinum necklace with GIA certification. The paper work from GIA (Gemological Institute of America) and GGA (GeAssure Gemological Appraisals) both note that the gemstones geographic origin is from Montana totaling 42.75 carats with no indications of heat treatment (very rare). The necklace is set in high polish platinum and also shows 30 round cut brilliant natural diamonds showing 8.25 carats, SI1-I1 clarity and G-H color. The necklace has a weight of 52.74 grams of Platinum and gemstones. No Heat Montana Sapphire Corundum with paperwork from both GIA and GGA certifying it is exceedingly rare with such a high carat total. The necklace shows wonderful colors of yellowish green, green, blue, brown, purple, violet, green, red and more. The necklace is appraised by GGA with a value of $168,390.00. Necklace measures 17.5"L.