Vint sz6 Plat/18k YG/WG VAN CLEEF GEN ALEXANDRITE? SPINEL? & dia cigar band uni

Vintage estate Unisex Size 6 Van cleef and arpel according to the engravings in the stone (vca makers mark, gold content, diamond clarity, van cleef & arpel etching) Platinum 725/825 (hard to read) & platinum 18k 800 mix two tone gold Weight 7.15g Bezel set gorgeous purple stone, glows in uv light Shifts from red to purple to greyish green I believe it is an alexandrite. Possibly a spinel if not alexandrite Selling as is Item Has been improperly stamped Thailand over platinum stamp and also 925 marked inside which is incorrect. Proper marking is visible and engraved in stones Acid test +for platinum 22k on yellow gold and platinum 18k for the white gold accent Fails for sterling silver (double checked for your clarification) 1/4” wide at setting cigar style band Very smooth and super comfortable! Absolute gorgeous stone! Lovely channel set diamonds Center stone is 10x8mm with setting (may be 9x7 alone) Channel diamond are genuine. Engraved with makers mark vca for van cleef & arpel Engraved pt*725 or 825? Sorry it’s very small! 4 round diamond top left bottom right alll ranging from 2-2.3mm See ruler for size Reasonably priced, per gram 18k is @100 a gram platinum is more. I am selling as is since I cannot be 100% on stone type or exact platinum number (725/750/800/825) Items are shipped daily Send an offer! Thanks I don’t accept returns please note this is a wide band and you may need to size down 1/4-1/2 sz