The Journal of Horticulture, Cottage Gardener, and Country Gentleman p. 349 (Nov 1, 1864)
This magnificent Rose [Marechal Niel], the most beautiful of all the Noisettes, to which belong Chromatella (Cloth of Gold), Isabella Gray, Jean Hardy, Solfaterre, &c., and surpasses them in habit and abundance of bloom. So says M. Verdier.

The Journal of Horticulture, Cottage Gardener, and Country Gentleman p. 410 (Nov 22, 1864)
If more yellow Roses are desired, the two Tea-scented Noisettes Isabella Gray and Jean Hardy ...

The yellow "Jean Hardy" is presumably Andrew Gray's 'Jane Hardy', named for his wife. It was (is?) a seedling of 'Chromatella'. The pink/rose colored variety is something else.

Dictionnaire des Roses, volume 1, page 388 (1883)
Max Singer
Nois.
Jean Hardy - Fleur moyenne, pleine; coloris rose carné.

Gardeners' Chronicle p. 750 (Oct 9, 1858)
The Isabella Gray Rose.— I felt much interest in the controversy respecting this Rose, and really anxious to know if there were two varieties in this country under the same name; I therefore applied to Mr. Buist, the highly respectable nurseryman of Philadelphia, for information on the subject, and now quote from his letter, dated September 20, 1858, as follows:—Mr. James Ritchie, florist, of this city, sold Messrs. Low the Rose; his stock and my own, from which the plants sent to you were propagated, are the same. The Isabella Gray Roses of Messrs. Paul, Low, and yours are identical. I sent plants of it to Messrs. Paul 6 or 12 months before Mr. Ritchie sent it to Messrs. Low, but they were lost at sea. There were two varieties sent out by Mr. Gray—Isabella Gray and Jane Hardy; the latter is easily known by its leafy calyx. I sent a plant of it last year to Messrs. Paul. The Rose, Isabella Gray, or Miss Gray, does not open well in a damp cold atmosphere with us, but from July to October it does well, and is now in fine bloom." So far Mr. Buist's information is interesting, as putting to rest the fears of some Rose growers that two varieties under the same name were in this country, and that one of them was superior to the other. In a letter I received from Mr. Buist, I think about two years since, he described the Rose Jane Hardy as deeper in colour than Isabella Gray, but as difficult to bloom well as the Old Double Yellow Rose, which, as is well known, rarely opens its flowers; good culture under glass, with gentle heat, may perhaps overcome this defect in Jane Hardy.
Thos. Rivers.

Apparently, Mr. Low, jun. purchased 'Jane Hardy' (named by Andrew Gray for his wife) along with its sister-seedling, 'Isabella Gray'.

Gardeners' Chronicle p. 266 (April 18, 1857)
Messrs. E. G. Henderson and Son's
Wellington Nursery, St. John's Wood, N.W.
MISS ISABELLA GRAY,
(GOLDEN YELLOW TEA ROSE).
Exhibited at the Meeting of the Horticultural Society in Regent Street, April 7, 1857, by Messrs. Hugh Low & Co., of whom we purchased the entire stock. Mr. Low, jun., met with it while travelling in South Carolina, in the garden of the raiser, Mr. GRAY (the raiser also of Cloth of Gold, Noisette), of whom he purchased it. At that time it was covered with flower and exposed to the burning sun without being injured in the slightest degree. The flowers are very large, foliage as fine as any of the Tea Roses in cultivation, a profuse flowerer—one plant now in our possession has more than 40 expanded and other flower-buds; the colour is a golden yellow, not straw, orange, lemon, or canary yellow, as all other Teas and Noisettes are.

From what we can hear there seems to be three Roses claiming this name with some variation, such as Miss Gray, or Miss Julia, Mary or Jane Gray, but what merit these others possess in comparison we are unable to state, but the only one that captivated Mr. Low, jun., is the Miss Isabella Gray, of whose beauty and merits he speaks in such glowing terms as surpassing all others.