Without having the ruby in front of a gemologist there is no way to tell. Rubies are graded much the same way that diamonds are.
They are graded on Cut, Color, Clarity and Carat with the exception that color has much more impact on the value.
Please see the link below for a better understanding of the grading process.
The value of a diamond depends on its cut, colour, carat weight and its clarity. A local jeweler can answer your question.
burme ruby 3 .75 carat capition red pigon what will be commercial price
A 3 carat round G color, VS2 clarity, IGI certified diamond is worth about $ $39,115. For further details you can email at www.dubaiwholesalediamonds.com/enquiry.
Every diamond is valued according to its colour, carat weight, clarity and cut. You've offered a MM measurement, which isn't a criteria of a diamond's worth.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.
Half a carat is .50, and a quarter of a carat is .25, therefore 3/8ths of a carat is .375
The auction record price per carat for ruby is the sale of an 8.62-carat cushion-cut 'pigeon's-blood red' unheated Burmese stone: $3,637,480 ($425,000 per carat). Purchased by Laurence Graff at Christie's. Set in a Bulgari rectangular-shaped diamond bombé mount, ring size 3¼, 18k gold. (15 February 2006, St. Moritz Palace Hotel, Geneva: Lot 352/Sale 1334)
Any diamond is 'worth' what someone will pay you for it. If you have such a diamond, best practices dictate that you pay a certified gemologist for a certificate describing and valuing the gem. You can purchase a diamond of this weight, colour and clarity grade, depending on the cut and pay from US$24,800 to US$30,700.
Please take your jewelery to an appraiser and the appraiser can see it, evaluate it, and give you a value. You can expect to pay for a certificate, which will become part of the jewelery's permanent history as to its composition and value.
About $800
SSD 3 is worth 80hrs.
There are 5 carats per gram. The answer is then 3/5 of a gram, or 0.6 grams.